<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:13167a93-8626-471b-b541-944f9527b357,g:1fb56dc5-3117-4525-84bd-7f862260486b-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.westpharma.com/role/Cover" xlink:type="simple" xlink:href="wst-20210331.xsd#Cover"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/Cover" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOMEUNAUDITED" xlink:type="simple" xlink:href="wst-20210331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOMEUNAUDITED"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOMEUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_5d5b8406-f17a-4acd-a437-be8cc3e9af2e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_41a1db03-4945-4adb-afdd-24d047c9540b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_5d5b8406-f17a-4acd-a437-be8cc3e9af2e" xlink:to="loc_us-gaap_OperatingIncomeLoss_41a1db03-4945-4adb-afdd-24d047c9540b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_8dd1be33-0dca-46a6-a53c-5dd32cc4ded6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_5d5b8406-f17a-4acd-a437-be8cc3e9af2e" xlink:to="loc_us-gaap_InterestExpense_8dd1be33-0dca-46a6-a53c-5dd32cc4ded6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeNet_e3ce43dc-6323-433e-b17b-b1d1f8d0e4bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentIncomeNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_5d5b8406-f17a-4acd-a437-be8cc3e9af2e" xlink:to="loc_us-gaap_InvestmentIncomeNet_e3ce43dc-6323-433e-b17b-b1d1f8d0e4bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_7825d075-23b0-46f3-9419-13f9fbcb05c6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_5d5b8406-f17a-4acd-a437-be8cc3e9af2e" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_7825d075-23b0-46f3-9419-13f9fbcb05c6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_03ee1ab0-bcef-4c16-a6cd-b59375509d95" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_624ef21e-8e6c-4f08-9e07-979cf11167cd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_03ee1ab0-bcef-4c16-a6cd-b59375509d95" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_624ef21e-8e6c-4f08-9e07-979cf11167cd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_a19808ed-90ad-4eb9-b8e0-44b039d2c889" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_03ee1ab0-bcef-4c16-a6cd-b59375509d95" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_a19808ed-90ad-4eb9-b8e0-44b039d2c889" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_84141c57-cdc3-4c1c-93b1-ba8bf7fcaa4f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_1a7d0672-fbc0-4a09-bb61-de9ebab45dea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_84141c57-cdc3-4c1c-93b1-ba8bf7fcaa4f" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_1a7d0672-fbc0-4a09-bb61-de9ebab45dea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_8a4ffc54-4226-4f14-ac02-99c5015101df" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_84141c57-cdc3-4c1c-93b1-ba8bf7fcaa4f" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_8a4ffc54-4226-4f14-ac02-99c5015101df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_ce1ebecd-3039-4a2b-b2b7-d94dd6f61ba5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_84141c57-cdc3-4c1c-93b1-ba8bf7fcaa4f" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_ce1ebecd-3039-4a2b-b2b7-d94dd6f61ba5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_f8687aa7-e869-4131-b4d6-4be604e94ad7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_99fb7353-cc1d-44b7-aabb-6830b0d57f0d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_f8687aa7-e869-4131-b4d6-4be604e94ad7" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_99fb7353-cc1d-44b7-aabb-6830b0d57f0d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_7ed1d5a9-800a-43da-828e-258d531463f0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_f8687aa7-e869-4131-b4d6-4be604e94ad7" xlink:to="loc_us-gaap_GrossProfit_7ed1d5a9-800a-43da-828e-258d531463f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_b403f36a-105d-4eb2-b511-7fa951896645" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_f8687aa7-e869-4131-b4d6-4be604e94ad7" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_b403f36a-105d-4eb2-b511-7fa951896645" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wst_OtherIncomeExpense_a1fe1215-c2ef-4feb-bba2-d205c24a228d" xlink:href="wst-20210331.xsd#wst_OtherIncomeExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_f8687aa7-e869-4131-b4d6-4be604e94ad7" xlink:to="loc_wst_OtherIncomeExpense_a1fe1215-c2ef-4feb-bba2-d205c24a228d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEUNAUDITED" xlink:type="simple" xlink:href="wst-20210331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEUNAUDITED"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_060de004-a10a-4edc-b902-d8263909b17c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_a4736bb6-47db-49b8-9538-9d1aa1f92590" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_060de004-a10a-4edc-b902-d8263909b17c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_a4736bb6-47db-49b8-9538-9d1aa1f92590" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_ced67d2c-cd03-4445-ac45-c076d3a2e800" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_060de004-a10a-4edc-b902-d8263909b17c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_ced67d2c-cd03-4445-ac45-c076d3a2e800" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_63c74699-e270-4222-af35-609b7a1e7156" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_060de004-a10a-4edc-b902-d8263909b17c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_63c74699-e270-4222-af35-609b7a1e7156" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_12e7576f-5542-4e91-9dd6-21bad5b26525" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_7b7a6b0e-93f4-420f-8bcf-115ce6975852" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_12e7576f-5542-4e91-9dd6-21bad5b26525" xlink:to="loc_us-gaap_NetIncomeLoss_7b7a6b0e-93f4-420f-8bcf-115ce6975852" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_a77fba54-e88f-46c4-bfb1-626b39e54898" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_12e7576f-5542-4e91-9dd6-21bad5b26525" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_a77fba54-e88f-46c4-bfb1-626b39e54898" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEUNAUDITEDParenthetical" xlink:type="simple" xlink:href="wst-20210331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEUNAUDITEDParenthetical"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEUNAUDITEDParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITED" xlink:type="simple" xlink:href="wst-20210331.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITED"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_8fdb41d3-3a2e-4318-9d71-aa3d129059d5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_3fb227ed-d0c0-48c9-80bf-84fd1e29c6e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8fdb41d3-3a2e-4318-9d71-aa3d129059d5" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_3fb227ed-d0c0-48c9-80bf-84fd1e29c6e3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_56a5c403-53ca-449c-895c-a3919a899264" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8fdb41d3-3a2e-4318-9d71-aa3d129059d5" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_56a5c403-53ca-449c-895c-a3919a899264" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_27526dee-437f-421f-996e-f714cdd1de25" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8fdb41d3-3a2e-4318-9d71-aa3d129059d5" xlink:to="loc_us-gaap_InventoryNet_27526dee-437f-421f-996e-f714cdd1de25" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_6b3d5d8c-514e-4723-875a-929ba55768ef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8fdb41d3-3a2e-4318-9d71-aa3d129059d5" xlink:to="loc_us-gaap_OtherAssetsCurrent_6b3d5d8c-514e-4723-875a-929ba55768ef" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_c8963f05-d142-46ed-ab4d-742ead3d43fd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_714278c1-f8a1-46c6-96d1-2810cc379d25" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c8963f05-d142-46ed-ab4d-742ead3d43fd" xlink:to="loc_us-gaap_Liabilities_714278c1-f8a1-46c6-96d1-2810cc379d25" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_8bddd195-eb83-4168-9dc6-b382d815a936" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c8963f05-d142-46ed-ab4d-742ead3d43fd" xlink:to="loc_us-gaap_CommitmentsAndContingencies_8bddd195-eb83-4168-9dc6-b382d815a936" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_9626d12f-f33a-48bd-a416-d46b7e77748c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c8963f05-d142-46ed-ab4d-742ead3d43fd" xlink:to="loc_us-gaap_StockholdersEquity_9626d12f-f33a-48bd-a416-d46b7e77748c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_4200f2d2-6973-443d-a185-04a02c5a89ed" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_1035c32b-d2df-4c97-bded-d1b9f7f12ad7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_4200f2d2-6973-443d-a185-04a02c5a89ed" xlink:to="loc_us-gaap_DebtCurrent_1035c32b-d2df-4c97-bded-d1b9f7f12ad7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_4b4c3ec8-4506-4289-810a-4521f3c9ff63" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_4200f2d2-6973-443d-a185-04a02c5a89ed" xlink:to="loc_us-gaap_AccountsPayableCurrent_4b4c3ec8-4506-4289-810a-4521f3c9ff63" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_4794e105-3eb6-473a-a9ca-71e66cd72753" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_4200f2d2-6973-443d-a185-04a02c5a89ed" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_4794e105-3eb6-473a-a9ca-71e66cd72753" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherEmployeeRelatedLiabilitiesCurrent_c58fa868-30c6-48d0-859d-5cde8f18a5e4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherEmployeeRelatedLiabilitiesCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_4200f2d2-6973-443d-a185-04a02c5a89ed" xlink:to="loc_us-gaap_OtherEmployeeRelatedLiabilitiesCurrent_c58fa868-30c6-48d0-859d-5cde8f18a5e4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_ad020489-afca-4c8d-b6f1-5748d0f89134" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_4200f2d2-6973-443d-a185-04a02c5a89ed" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_ad020489-afca-4c8d-b6f1-5748d0f89134" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_ce60a419-743b-42b9-a898-81b60192f455" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_4200f2d2-6973-443d-a185-04a02c5a89ed" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_ce60a419-743b-42b9-a898-81b60192f455" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_7f335387-424d-4ce9-aa3c-5a94047afce1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_4200f2d2-6973-443d-a185-04a02c5a89ed" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_7f335387-424d-4ce9-aa3c-5a94047afce1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_f058459a-4f74-4fe4-a3e0-0f6506151f0b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_c92b5e61-a2a5-4fbc-8146-e2219d859640" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_f058459a-4f74-4fe4-a3e0-0f6506151f0b" xlink:to="loc_us-gaap_LiabilitiesCurrent_c92b5e61-a2a5-4fbc-8146-e2219d859640" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_78cc7dfa-6c28-4456-a871-4d68fc9d3e71" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_f058459a-4f74-4fe4-a3e0-0f6506151f0b" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_78cc7dfa-6c28-4456-a871-4d68fc9d3e71" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_fed71de0-d3fa-4350-beb2-7f98f4aa161c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_f058459a-4f74-4fe4-a3e0-0f6506151f0b" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_fed71de0-d3fa-4350-beb2-7f98f4aa161c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_e392137f-ebba-40b9-8878-d9b2b9a8a3a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_f058459a-4f74-4fe4-a3e0-0f6506151f0b" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_e392137f-ebba-40b9-8878-d9b2b9a8a3a4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_f5bc6976-c34a-4c78-b2c8-5cff9a8609bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_f058459a-4f74-4fe4-a3e0-0f6506151f0b" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_f5bc6976-c34a-4c78-b2c8-5cff9a8609bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_abdccfcd-1dca-4ffd-b89c-1f09fa870891" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_f058459a-4f74-4fe4-a3e0-0f6506151f0b" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_abdccfcd-1dca-4ffd-b89c-1f09fa870891" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_968b38b3-7c70-4ad5-a511-cc51ca93d141" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_f058459a-4f74-4fe4-a3e0-0f6506151f0b" xlink:to="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_968b38b3-7c70-4ad5-a511-cc51ca93d141" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_72c12b3a-1267-4635-bfd7-8906de333871" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_e9b6ff22-348e-4d71-9dbc-18a3c580195b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_72c12b3a-1267-4635-bfd7-8906de333871" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_e9b6ff22-348e-4d71-9dbc-18a3c580195b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_43a78e51-522f-4424-962c-6b36f73b74f4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_72c12b3a-1267-4635-bfd7-8906de333871" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_43a78e51-522f-4424-962c-6b36f73b74f4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_26e31d8a-cf90-48c3-b694-d225319381ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_4b50a050-d728-4345-a02e-3d38331ca42d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_26e31d8a-cf90-48c3-b694-d225319381ee" xlink:to="loc_us-gaap_AssetsCurrent_4b50a050-d728-4345-a02e-3d38331ca42d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_ef004def-ccbe-44db-a5e2-8df874d2ef73" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_26e31d8a-cf90-48c3-b694-d225319381ee" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_ef004def-ccbe-44db-a5e2-8df874d2ef73" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_50609c06-4e84-4ca0-a4a1-5bd7a7d6ec84" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_26e31d8a-cf90-48c3-b694-d225319381ee" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_50609c06-4e84-4ca0-a4a1-5bd7a7d6ec84" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_8a2dde63-bf27-41e1-9de7-cdecfbb8dcfd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_26e31d8a-cf90-48c3-b694-d225319381ee" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_8a2dde63-bf27-41e1-9de7-cdecfbb8dcfd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_ba51f192-90cc-4a8e-90a0-54db68e74379" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_26e31d8a-cf90-48c3-b694-d225319381ee" xlink:to="loc_us-gaap_Goodwill_ba51f192-90cc-4a8e-90a0-54db68e74379" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_275c3400-cd68-44d9-a602-3a2ec896113c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_26e31d8a-cf90-48c3-b694-d225319381ee" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_275c3400-cd68-44d9-a602-3a2ec896113c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_c508750a-4975-4e95-a379-c0005cc15d7b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_26e31d8a-cf90-48c3-b694-d225319381ee" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_c508750a-4975-4e95-a379-c0005cc15d7b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_3cbdfab6-107f-49b4-8659-16770e64c24d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_26e31d8a-cf90-48c3-b694-d225319381ee" xlink:to="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_3cbdfab6-107f-49b4-8659-16770e64c24d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_1bdeae52-a97f-46cb-9a97-4b9ac217129d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_26e31d8a-cf90-48c3-b694-d225319381ee" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_1bdeae52-a97f-46cb-9a97-4b9ac217129d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_9a1cd2bf-6eb1-42ec-b769-19f9e684cc70" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_c34f5a77-9e9f-48dd-836b-5ea9bb596290" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_9a1cd2bf-6eb1-42ec-b769-19f9e684cc70" xlink:to="loc_us-gaap_PreferredStockValue_c34f5a77-9e9f-48dd-836b-5ea9bb596290" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_f0134ddc-5357-4bd2-8de8-b828c2109d5d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_9a1cd2bf-6eb1-42ec-b769-19f9e684cc70" xlink:to="loc_us-gaap_CommonStockValue_f0134ddc-5357-4bd2-8de8-b828c2109d5d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_cb4e6b43-96d3-4c4a-b0df-3504afa2da6e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_9a1cd2bf-6eb1-42ec-b769-19f9e684cc70" xlink:to="loc_us-gaap_AdditionalPaidInCapital_cb4e6b43-96d3-4c4a-b0df-3504afa2da6e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_4b202839-cf12-4e60-904c-25fd4b53c7e1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_9a1cd2bf-6eb1-42ec-b769-19f9e684cc70" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_4b202839-cf12-4e60-904c-25fd4b53c7e1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_ab624887-5fdb-421a-85cc-c5d7242103cc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_9a1cd2bf-6eb1-42ec-b769-19f9e684cc70" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_ab624887-5fdb-421a-85cc-c5d7242103cc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_7a0fe4bc-fd77-4b98-9f11-b74ba2b2a91c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockValue"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_9a1cd2bf-6eb1-42ec-b769-19f9e684cc70" xlink:to="loc_us-gaap_TreasuryStockValue_7a0fe4bc-fd77-4b98-9f11-b74ba2b2a91c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITEDParenthetical" xlink:type="simple" xlink:href="wst-20210331.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITEDParenthetical"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITEDParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITED" xlink:type="simple" xlink:href="wst-20210331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITED"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1fd33549-c1d5-4394-900e-cdffa7b7ff38" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_a3ed2c39-2685-4c62-8385-a2efc9871476" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1fd33549-c1d5-4394-900e-cdffa7b7ff38" xlink:to="loc_us-gaap_NetIncomeLoss_a3ed2c39-2685-4c62-8385-a2efc9871476" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_d0d68718-47ee-46ac-bf13-1ef6a291067c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Depreciation"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1fd33549-c1d5-4394-900e-cdffa7b7ff38" xlink:to="loc_us-gaap_Depreciation_d0d68718-47ee-46ac-bf13-1ef6a291067c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentForAmortization_ac1dc0ff-12e8-42c8-b5e9-f52ce92f8554" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentForAmortization"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1fd33549-c1d5-4394-900e-cdffa7b7ff38" xlink:to="loc_us-gaap_AdjustmentForAmortization_ac1dc0ff-12e8-42c8-b5e9-f52ce92f8554" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_94e4c997-b878-4945-b2d7-29bbcb855672" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1fd33549-c1d5-4394-900e-cdffa7b7ff38" xlink:to="loc_us-gaap_ShareBasedCompensation_94e4c997-b878-4945-b2d7-29bbcb855672" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wst_PensionSettlementCharge_da295b47-1d72-4686-9511-003541d391ce" xlink:href="wst-20210331.xsd#wst_PensionSettlementCharge"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1fd33549-c1d5-4394-900e-cdffa7b7ff38" xlink:to="loc_wst_PensionSettlementCharge_da295b47-1d72-4686-9511-003541d391ce" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityOperatingActivities_f5c7a61b-4165-47aa-b9d5-7d2271ae7159" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentForContingentConsiderationLiabilityOperatingActivities"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1fd33549-c1d5-4394-900e-cdffa7b7ff38" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityOperatingActivities_f5c7a61b-4165-47aa-b9d5-7d2271ae7159" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_eb74d451-80d1-409a-9d51-6a5cfacd817a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1fd33549-c1d5-4394-900e-cdffa7b7ff38" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_eb74d451-80d1-409a-9d51-6a5cfacd817a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_c4a8d5fb-a947-4c39-9bfa-f36d1a731d69" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1fd33549-c1d5-4394-900e-cdffa7b7ff38" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_c4a8d5fb-a947-4c39-9bfa-f36d1a731d69" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8e4872b8-0472-40f2-95f6-202bd7169fd3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fa9a61b1-5899-4280-ac6b-e0b6d1181f88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8e4872b8-0472-40f2-95f6-202bd7169fd3" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fa9a61b1-5899-4280-ac6b-e0b6d1181f88" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_495f73ec-35de-491d-9722-c5aa01cb1018" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8e4872b8-0472-40f2-95f6-202bd7169fd3" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_495f73ec-35de-491d-9722-c5aa01cb1018" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d2f7058c-e992-43f8-adf2-205f1612e680" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8e4872b8-0472-40f2-95f6-202bd7169fd3" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d2f7058c-e992-43f8-adf2-205f1612e680" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_50a979aa-95fa-4d1e-a696-400c25a43abc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8e4872b8-0472-40f2-95f6-202bd7169fd3" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_50a979aa-95fa-4d1e-a696-400c25a43abc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_59319a04-f245-452e-9a06-bf4422d3adba" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans_4c1e9d9d-1c56-4965-854d-04741d0ea7b0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_59319a04-f245-452e-9a06-bf4422d3adba" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans_4c1e9d9d-1c56-4965-854d-04741d0ea7b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_20853f52-aa2a-44ed-96fc-36f962af1b1b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_59319a04-f245-452e-9a06-bf4422d3adba" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_20853f52-aa2a-44ed-96fc-36f962af1b1b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfOtherLongTermDebt_412ce601-dd87-4476-95ab-16cf04d87807" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfOtherLongTermDebt"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_59319a04-f245-452e-9a06-bf4422d3adba" xlink:to="loc_us-gaap_RepaymentsOfOtherLongTermDebt_412ce601-dd87-4476-95ab-16cf04d87807" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_b4552356-5c37-4506-aeff-fb6d9a7e84b2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_59319a04-f245-452e-9a06-bf4422d3adba" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_b4552356-5c37-4506-aeff-fb6d9a7e84b2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_c5482571-054e-4c0a-b6fc-34a8cce23c26" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_59319a04-f245-452e-9a06-bf4422d3adba" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_c5482571-054e-4c0a-b6fc-34a8cce23c26" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_06620dc0-7089-4aa1-9688-4b8ee686a70b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_59319a04-f245-452e-9a06-bf4422d3adba" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_06620dc0-7089-4aa1-9688-4b8ee686a70b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2dfd5d8a-ba5f-4d55-9223-44233e19912b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_28371b31-1960-4343-a232-5c483723a1b5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2dfd5d8a-ba5f-4d55-9223-44233e19912b" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_28371b31-1960-4343-a232-5c483723a1b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_d6dd3364-08a5-415f-8cc4-470e682be282" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2dfd5d8a-ba5f-4d55-9223-44233e19912b" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_d6dd3364-08a5-415f-8cc4-470e682be282" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/BasisofPresentationandSummaryofSignificantAccountingPolicies" xlink:type="simple" xlink:href="wst-20210331.xsd#BasisofPresentationandSummaryofSignificantAccountingPolicies"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/BasisofPresentationandSummaryofSignificantAccountingPolicies" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesPolicies" xlink:type="simple" xlink:href="wst-20210331.xsd#BasisofPresentationandSummaryofSignificantAccountingPoliciesPolicies"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesPolicies" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/NewAccountingStandards" xlink:type="simple" xlink:href="wst-20210331.xsd#NewAccountingStandards"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/NewAccountingStandards" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/Revenue" xlink:type="simple" xlink:href="wst-20210331.xsd#Revenue"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/Revenue" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/RevenueTables" xlink:type="simple" xlink:href="wst-20210331.xsd#RevenueTables"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/RevenueTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/RevenueRevenueRecognitionDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#RevenueRevenueRecognitionDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/RevenueRevenueRecognitionDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/RevenueContractsandLiabilitiesDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#RevenueContractsandLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/RevenueContractsandLiabilitiesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/RevenueContractsandLiabilitiesNarrativeDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#RevenueContractsandLiabilitiesNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/RevenueContractsandLiabilitiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_b44981f3-c265-452e-ae46-d3bffbfc9e96" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_e6850526-4751-4493-a90e-0ab485fed953" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ContractWithCustomerLiability_b44981f3-c265-452e-ae46-d3bffbfc9e96" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_e6850526-4751-4493-a90e-0ab485fed953" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_8365c978-31fc-4656-90ef-fbfd3f80a89d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ContractWithCustomerLiability_b44981f3-c265-452e-ae46-d3bffbfc9e96" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_8365c978-31fc-4656-90ef-fbfd3f80a89d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/NetIncomePerShare" xlink:type="simple" xlink:href="wst-20210331.xsd#NetIncomePerShare"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/NetIncomePerShare" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/NetIncomePerShareTables" xlink:type="simple" xlink:href="wst-20210331.xsd#NetIncomePerShareTables"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/NetIncomePerShareTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/NetIncomePerShareDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#NetIncomePerShareDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/NetIncomePerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_da4b55ca-78d9-4dc7-b309-db0fc54ad0b9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_be0a4cb9-3e2d-42fb-b529-39ef9f78ba49" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_da4b55ca-78d9-4dc7-b309-db0fc54ad0b9" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_be0a4cb9-3e2d-42fb-b529-39ef9f78ba49" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_82780443-61bb-4f44-9c1b-2cc596744cf0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_da4b55ca-78d9-4dc7-b309-db0fc54ad0b9" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_82780443-61bb-4f44-9c1b-2cc596744cf0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/Inventories" xlink:type="simple" xlink:href="wst-20210331.xsd#Inventories"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/Inventories" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/InventoriesTables" xlink:type="simple" xlink:href="wst-20210331.xsd#InventoriesTables"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/InventoriesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/InventoriesDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#InventoriesDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/InventoriesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_5dee3746-5d64-46b7-bb1f-6bf4d96c1d3d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_9068db8f-d377-4c95-9cc6-cdb15fc43988" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_5dee3746-5d64-46b7-bb1f-6bf4d96c1d3d" xlink:to="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_9068db8f-d377-4c95-9cc6-cdb15fc43988" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWorkInProcessNetOfReserves_973018a8-406f-43c3-a7b8-37aba5b6d6aa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryWorkInProcessNetOfReserves"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_5dee3746-5d64-46b7-bb1f-6bf4d96c1d3d" xlink:to="loc_us-gaap_InventoryWorkInProcessNetOfReserves_973018a8-406f-43c3-a7b8-37aba5b6d6aa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryRawMaterialsNetOfReserves_aea257ce-e103-4b1c-8901-2d38acbe2aca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryRawMaterialsNetOfReserves"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_5dee3746-5d64-46b7-bb1f-6bf4d96c1d3d" xlink:to="loc_us-gaap_InventoryRawMaterialsNetOfReserves_aea257ce-e103-4b1c-8901-2d38acbe2aca" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/Leases" xlink:type="simple" xlink:href="wst-20210331.xsd#Leases"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/Leases" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/LeasesTables" xlink:type="simple" xlink:href="wst-20210331.xsd#LeasesTables"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/LeasesTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/LeasesLeaseCostDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#LeasesLeaseCostDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/LeasesLeaseCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_7338241b-6a73-4815-9083-326badbeb302" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_4447e7ca-ab3f-47de-8d2f-401bca42f4ea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_7338241b-6a73-4815-9083-326badbeb302" xlink:to="loc_us-gaap_OperatingLeaseCost_4447e7ca-ab3f-47de-8d2f-401bca42f4ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_91111df5-d551-484b-911e-653fc98e6d0e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermLeaseCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_7338241b-6a73-4815-9083-326badbeb302" xlink:to="loc_us-gaap_ShortTermLeaseCost_91111df5-d551-484b-911e-653fc98e6d0e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_71f04265-e40d-405e-b8e0-b3af3951a06a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VariableLeaseCost"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_7338241b-6a73-4815-9083-326badbeb302" xlink:to="loc_us-gaap_VariableLeaseCost_71f04265-e40d-405e-b8e0-b3af3951a06a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/LeasesLeaseCashFlowandSupplementalInformationDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#LeasesLeaseCashFlowandSupplementalInformationDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/LeasesLeaseCashFlowandSupplementalInformationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/LeasesLeaseWeightedAverageDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#LeasesLeaseWeightedAverageDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/LeasesLeaseWeightedAverageDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#LeasesMaturitiesofOperatingLeaseLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ae0f3474-a6e0-4333-9784-27fd524a0d69" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_583b7aa3-4fca-4c5c-a9dd-b06b5cba70f0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ae0f3474-a6e0-4333-9784-27fd524a0d69" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_583b7aa3-4fca-4c5c-a9dd-b06b5cba70f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_56fa3a7d-fb8e-454f-b5fb-6c701bd48a4c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ae0f3474-a6e0-4333-9784-27fd524a0d69" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_56fa3a7d-fb8e-454f-b5fb-6c701bd48a4c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0d9d40ff-fa2c-4362-afc5-1c413644675c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ae0f3474-a6e0-4333-9784-27fd524a0d69" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0d9d40ff-fa2c-4362-afc5-1c413644675c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_44e7ec50-3392-4b5d-b4ee-b25c29ecde8d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ae0f3474-a6e0-4333-9784-27fd524a0d69" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_44e7ec50-3392-4b5d-b4ee-b25c29ecde8d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_32bfaf6d-04e8-4d60-a70a-4fc2c59adda4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ae0f3474-a6e0-4333-9784-27fd524a0d69" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_32bfaf6d-04e8-4d60-a70a-4fc2c59adda4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wst_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_7436f422-f981-41b3-ab22-06a5ffbf9aac" xlink:href="wst-20210331.xsd#wst_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ae0f3474-a6e0-4333-9784-27fd524a0d69" xlink:to="loc_wst_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_7436f422-f981-41b3-ab22-06a5ffbf9aac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_d280b5be-d051-4872-b0fa-92dc485cc387" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ae0f3474-a6e0-4333-9784-27fd524a0d69" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_d280b5be-d051-4872-b0fa-92dc485cc387" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_5d828304-0199-45f2-a02c-894134fb2e9f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ae0f3474-a6e0-4333-9784-27fd524a0d69" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_5d828304-0199-45f2-a02c-894134fb2e9f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails_1" xlink:type="simple" xlink:href="wst-20210331.xsd#LeasesMaturitiesofOperatingLeaseLiabilitiesDetails_1"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_2b939b79-ddbe-4ce9-a661-ea75ecddda8f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_c8b9d9ed-c9f6-4c47-ac16-6b1b35f9f881" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_2b939b79-ddbe-4ce9-a661-ea75ecddda8f" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_c8b9d9ed-c9f6-4c47-ac16-6b1b35f9f881" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_29d7afd8-268f-4698-9cdb-4c1d16c742bc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_2b939b79-ddbe-4ce9-a661-ea75ecddda8f" xlink:to="loc_us-gaap_OperatingLeaseLiability_29d7afd8-268f-4698-9cdb-4c1d16c742bc" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/AffiliatedCompanies" xlink:type="simple" xlink:href="wst-20210331.xsd#AffiliatedCompanies"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/AffiliatedCompanies" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/AffiliatedCompaniesDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#AffiliatedCompaniesDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/AffiliatedCompaniesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/Debt" xlink:type="simple" xlink:href="wst-20210331.xsd#Debt"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/Debt" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/DebtTables" xlink:type="simple" xlink:href="wst-20210331.xsd#DebtTables"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/DebtTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/DebtLongtermDebtDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#DebtLongtermDebtDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/DebtLongtermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_758dd797-a09e-40b9-ac4f-77f5de6a9281" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_0d8160c1-53ce-4e25-a0f1-85440d177166" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_758dd797-a09e-40b9-ac4f-77f5de6a9281" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_0d8160c1-53ce-4e25-a0f1-85440d177166" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_76819882-9964-4f21-8782-dea745c524af" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_758dd797-a09e-40b9-ac4f-77f5de6a9281" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_76819882-9964-4f21-8782-dea745c524af" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/DebtLongtermDebtDetails_1" xlink:type="simple" xlink:href="wst-20210331.xsd#DebtLongtermDebtDetails_1"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/DebtLongtermDebtDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_b12bea1a-b059-4f2d-8ff7-1e627a9b7e3c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_50f18995-add1-4180-ab43-3e38e35f0e6f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_b12bea1a-b059-4f2d-8ff7-1e627a9b7e3c" xlink:to="loc_us-gaap_LongTermDebtCurrent_50f18995-add1-4180-ab43-3e38e35f0e6f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_0193f5cb-d80b-471b-9c3a-77eb28301df4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_b12bea1a-b059-4f2d-8ff7-1e627a9b7e3c" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_0193f5cb-d80b-471b-9c3a-77eb28301df4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/DebtCreditAgreementDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#DebtCreditAgreementDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/DebtCreditAgreementDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/DerivativeFinancialInstruments" xlink:type="simple" xlink:href="wst-20210331.xsd#DerivativeFinancialInstruments"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/DerivativeFinancialInstruments" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/DerivativeFinancialInstrumentsTables" xlink:type="simple" xlink:href="wst-20210331.xsd#DerivativeFinancialInstrumentsTables"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/DerivativeFinancialInstrumentsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/DerivativeFinancialInstrumentsForeignExchangeRateRiskDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#DerivativeFinancialInstrumentsForeignExchangeRateRiskDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/DerivativeFinancialInstrumentsForeignExchangeRateRiskDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/DerivativeFinancialInstrumentsEffectsofDerivativeInstrumentsonOCIandEarningsDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#DerivativeFinancialInstrumentsEffectsofDerivativeInstrumentsonOCIandEarningsDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/DerivativeFinancialInstrumentsEffectsofDerivativeInstrumentsonOCIandEarningsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_7f1cf6df-214d-4c51-b202-be8d207e35f9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_76eee128-d4ed-449f-9864-ac41f0551efd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_7f1cf6df-214d-4c51-b202-be8d207e35f9" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_76eee128-d4ed-449f-9864-ac41f0551efd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_60910b71-6c9d-4c50-ae5e-51dff48450a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_7f1cf6df-214d-4c51-b202-be8d207e35f9" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_60910b71-6c9d-4c50-ae5e-51dff48450a9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_783d157a-3ffd-49a1-b01c-4595d1b17407" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_7f1cf6df-214d-4c51-b202-be8d207e35f9" xlink:to="loc_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_783d157a-3ffd-49a1-b01c-4595d1b17407" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/FairValueMeasurements" xlink:type="simple" xlink:href="wst-20210331.xsd#FairValueMeasurements"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/FairValueMeasurements" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/FairValueMeasurementsTables" xlink:type="simple" xlink:href="wst-20210331.xsd#FairValueMeasurementsTables"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/FairValueMeasurementsTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/FairValueMeasurementsAssetsandLiabilitiesRecordedatFairValueDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#FairValueMeasurementsAssetsandLiabilitiesRecordedatFairValueDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/FairValueMeasurementsAssetsandLiabilitiesRecordedatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_06964465-f0c9-44e0-8386-1d89bcda6040" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_27d01816-7db7-4211-9ce4-d58a0963a8b0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_06964465-f0c9-44e0-8386-1d89bcda6040" xlink:to="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_27d01816-7db7-4211-9ce4-d58a0963a8b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_0c9d5256-5db5-422b-b433-db3644d57356" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_06964465-f0c9-44e0-8386-1d89bcda6040" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_0c9d5256-5db5-422b-b433-db3644d57356" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent_01584a2f-f03e-4f75-824e-2d638ff545e1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_06964465-f0c9-44e0-8386-1d89bcda6040" xlink:to="loc_us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent_01584a2f-f03e-4f75-824e-2d638ff545e1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_049983b6-05dc-4896-863f-6bfb4aad1375" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_b6a36d21-41c8-4e45-acb7-ccb75d67b30c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignCurrencyContractAssetFairValueDisclosure"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_049983b6-05dc-4896-863f-6bfb4aad1375" xlink:to="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_b6a36d21-41c8-4e45-acb7-ccb75d67b30c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_b533ea47-2a38-458a-b22e-6f0eb48a9f3c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssets"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_049983b6-05dc-4896-863f-6bfb4aad1375" xlink:to="loc_us-gaap_DerivativeAssets_b533ea47-2a38-458a-b22e-6f0eb48a9f3c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationPlanAssets_f0f368de-f1b0-4f07-a7d3-d8189363bd2f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCompensationPlanAssets"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_049983b6-05dc-4896-863f-6bfb4aad1375" xlink:to="loc_us-gaap_DeferredCompensationPlanAssets_f0f368de-f1b0-4f07-a7d3-d8189363bd2f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/FairValueMeasurementLevel3FairValueMeasurementsDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#FairValueMeasurementLevel3FairValueMeasurementsDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/FairValueMeasurementLevel3FairValueMeasurementsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/FairValueMeasurementOtherFinancialInstrumentsDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#FairValueMeasurementOtherFinancialInstrumentsDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/FairValueMeasurementOtherFinancialInstrumentsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/AccumulatedOtherComprehensiveLoss" xlink:type="simple" xlink:href="wst-20210331.xsd#AccumulatedOtherComprehensiveLoss"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/AccumulatedOtherComprehensiveLoss" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/AccumulatedOtherComprehensiveLossTables" xlink:type="simple" xlink:href="wst-20210331.xsd#AccumulatedOtherComprehensiveLossTables"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/AccumulatedOtherComprehensiveLossTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/AccumulatedOtherComprehensiveLossComponentsofAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#AccumulatedOtherComprehensiveLossComponentsofAccumulatedOtherComprehensiveIncomeDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/AccumulatedOtherComprehensiveLossComponentsofAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_ce1ce272-c4a2-484c-8117-b3a0a68d75fd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_438a02d6-7e76-42b1-8f6b-5f5402ae9611" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_ce1ce272-c4a2-484c-8117-b3a0a68d75fd" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_438a02d6-7e76-42b1-8f6b-5f5402ae9611" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_5f691c3e-57f3-4fa8-a033-3a395b5e1c0a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_ce1ce272-c4a2-484c-8117-b3a0a68d75fd" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_5f691c3e-57f3-4fa8-a033-3a395b5e1c0a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/AccumulatedOtherComprehensiveLossOtherComprehensiveLossReclassificationsDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#AccumulatedOtherComprehensiveLossOtherComprehensiveLossReclassificationsDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/AccumulatedOtherComprehensiveLossOtherComprehensiveLossReclassificationsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/ShareholdersEquity" xlink:type="simple" xlink:href="wst-20210331.xsd#ShareholdersEquity"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/ShareholdersEquity" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/ShareholdersEquityTables" xlink:type="simple" xlink:href="wst-20210331.xsd#ShareholdersEquityTables"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/ShareholdersEquityTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/ShareholdersEquityChangeinShareholdersEquityDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#ShareholdersEquityChangeinShareholdersEquityDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/ShareholdersEquityChangeinShareholdersEquityDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/ShareholdersEquitySupplementalEquityInformationDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#ShareholdersEquitySupplementalEquityInformationDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/ShareholdersEquitySupplementalEquityInformationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/StockBasedCompensation" xlink:type="simple" xlink:href="wst-20210331.xsd#StockBasedCompensation"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/StockBasedCompensation" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/StockBasedCompensationDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#StockBasedCompensationDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/StockBasedCompensationDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/BenefitPlans" xlink:type="simple" xlink:href="wst-20210331.xsd#BenefitPlans"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/BenefitPlans" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/BenefitPlansTables" xlink:type="simple" xlink:href="wst-20210331.xsd#BenefitPlansTables"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/BenefitPlansTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/BenefitPlansScheduleofComponentsofNetPeriodicBenefitCostDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#BenefitPlansScheduleofComponentsofNetPeriodicBenefitCostDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/BenefitPlansScheduleofComponentsofNetPeriodicBenefitCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_78ffe919-bb5c-45f3-8679-0bf580d5babc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_a886252e-4ea4-4506-8dc2-6ef17379e43b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_78ffe919-bb5c-45f3-8679-0bf580d5babc" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_a886252e-4ea4-4506-8dc2-6ef17379e43b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_34d220e9-0b33-46a6-8b0e-bce59d35d3f3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_78ffe919-bb5c-45f3-8679-0bf580d5babc" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_34d220e9-0b33-46a6-8b0e-bce59d35d3f3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_0e25f16a-a031-42ea-8d9d-8e9359df4319" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_78ffe919-bb5c-45f3-8679-0bf580d5babc" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_0e25f16a-a031-42ea-8d9d-8e9359df4319" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_b1d718a9-a6ef-4baf-b2fd-d764ab2d0035" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_78ffe919-bb5c-45f3-8679-0bf580d5babc" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_b1d718a9-a6ef-4baf-b2fd-d764ab2d0035" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_1c1d93a0-8c95-4642-b951-e3809c55aba5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_78ffe919-bb5c-45f3-8679-0bf580d5babc" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_1c1d93a0-8c95-4642-b951-e3809c55aba5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_848ea066-8f5c-48c0-acc8-5d38582fd65f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_78ffe919-bb5c-45f3-8679-0bf580d5babc" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_848ea066-8f5c-48c0-acc8-5d38582fd65f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/BenefitPlansNarrativeDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#BenefitPlansNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/BenefitPlansNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/OtherExpenseIncome" xlink:type="simple" xlink:href="wst-20210331.xsd#OtherExpenseIncome"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/OtherExpenseIncome" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/OtherExpenseIncomeTables" xlink:type="simple" xlink:href="wst-20210331.xsd#OtherExpenseIncomeTables"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/OtherExpenseIncomeTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/OtherExpenseIncomeOtherExpenseIncomeDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#OtherExpenseIncomeOtherExpenseIncomeDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/OtherExpenseIncomeOtherExpenseIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wst_OtherIncomeExpense_7099e18c-6d5e-4c8b-a0ff-282191ad98b5" xlink:href="wst-20210331.xsd#wst_OtherIncomeExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_041f9af0-d38c-445d-b805-b7004af6cf06" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringAndRelatedCostIncurredCost"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wst_OtherIncomeExpense_7099e18c-6d5e-4c8b-a0ff-282191ad98b5" xlink:to="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_041f9af0-d38c-445d-b805-b7004af6cf06" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetImpairmentCharges_083119d2-1887-4925-a6bc-eb68b1dbc65b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetImpairmentCharges"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wst_OtherIncomeExpense_7099e18c-6d5e-4c8b-a0ff-282191ad98b5" xlink:to="loc_us-gaap_OtherAssetImpairmentCharges_083119d2-1887-4925-a6bc-eb68b1dbc65b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_99d15569-c6ae-417a-a92d-6d39f25ab8ce" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wst_OtherIncomeExpense_7099e18c-6d5e-4c8b-a0ff-282191ad98b5" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_99d15569-c6ae-417a-a92d-6d39f25ab8ce" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_ee73419f-b1ae-4713-8989-e816310bf5ea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wst_OtherIncomeExpense_7099e18c-6d5e-4c8b-a0ff-282191ad98b5" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_ee73419f-b1ae-4713-8989-e816310bf5ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseNet_a01b4442-521f-4ed8-871b-a52d93f85f2e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherOperatingIncomeExpenseNet"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wst_OtherIncomeExpense_7099e18c-6d5e-4c8b-a0ff-282191ad98b5" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseNet_a01b4442-521f-4ed8-871b-a52d93f85f2e" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westpharma.com/role/OtherExpenseIncomeRestructuringandRelatedChargesDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#OtherExpenseIncomeRestructuringandRelatedChargesDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/OtherExpenseIncomeRestructuringandRelatedChargesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/OtherExpenseIncomeOtherItemsDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#OtherExpenseIncomeOtherItemsDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/OtherExpenseIncomeOtherItemsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/IncomeTaxes" xlink:type="simple" xlink:href="wst-20210331.xsd#IncomeTaxes"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/IncomeTaxes" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/IncomeTaxesDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#IncomeTaxesDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/IncomeTaxesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/CommitmentsandContingencies" xlink:type="simple" xlink:href="wst-20210331.xsd#CommitmentsandContingencies"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/CommitmentsandContingencies" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/SegmentInformation" xlink:type="simple" xlink:href="wst-20210331.xsd#SegmentInformation"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/SegmentInformation" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/SegmentInformationTables" xlink:type="simple" xlink:href="wst-20210331.xsd#SegmentInformationTables"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/SegmentInformationTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/SegmentInformationNarrativeDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#SegmentInformationNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/SegmentInformationNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.westpharma.com/role/SegmentInformationSegmentFinancialInformationDetails" xlink:type="simple" xlink:href="wst-20210331.xsd#SegmentInformationSegmentFinancialInformationDetails"/>
  <link:calculationLink xlink:role="http://www.westpharma.com/role/SegmentInformationSegmentFinancialInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_87be7c09-af6e-4df0-be5c-0419260fea16" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_2722a596-52b7-4f9c-b255-360a755964b0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_87be7c09-af6e-4df0-be5c-0419260fea16" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_2722a596-52b7-4f9c-b255-360a755964b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_2c3e3847-d8c8-4fff-aaf6-2b55eaf02992" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_87be7c09-af6e-4df0-be5c-0419260fea16" xlink:to="loc_us-gaap_OperatingIncomeLoss_2c3e3847-d8c8-4fff-aaf6-2b55eaf02992" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
