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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:e6657d08-e5d4-43ff-a549-63f82bfe63b5,g:e0849d07-7e7c-4f78-b7a7-a5bb8b97bc61-->
<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.westlake.com/role/ConsolidatedBalanceSheets" xlink:type="simple" xlink:href="wlkp-20210630.xsd#ConsolidatedBalanceSheets"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_b1562616-2d8c-4cdc-af4b-5af8d211cf00" 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_a58a64f9-8bc4-402f-beb3-c035c488dfa0" 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_b1562616-2d8c-4cdc-af4b-5af8d211cf00" xlink:to="loc_us-gaap_AssetsCurrent_a58a64f9-8bc4-402f-beb3-c035c488dfa0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_3215fda9-2014-4dad-a20f-606fcf699bed" 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_b1562616-2d8c-4cdc-af4b-5af8d211cf00" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_3215fda9-2014-4dad-a20f-606fcf699bed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_a742b824-969f-42d2-9131-856b16c14d84" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_b1562616-2d8c-4cdc-af4b-5af8d211cf00" xlink:to="loc_us-gaap_Goodwill_a742b824-969f-42d2-9131-856b16c14d84" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCostsAndOtherAssets_aa61f72c-24b7-4487-88ed-a0059d8ed12c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCostsAndOtherAssets"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_b1562616-2d8c-4cdc-af4b-5af8d211cf00" xlink:to="loc_us-gaap_DeferredCostsAndOtherAssets_aa61f72c-24b7-4487-88ed-a0059d8ed12c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_4cc227bc-a9c7-4344-9aae-b793d3d9f6c6" 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_7d3083bc-b00c-4744-9792-1dbedc63ff08" 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_4cc227bc-a9c7-4344-9aae-b793d3d9f6c6" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_7d3083bc-b00c-4744-9792-1dbedc63ff08" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_ReceivablesunderInvestmentManagementAgreementswithRelatedPartiesCurrent_bc69880b-fcfe-476a-8aa7-b0205e8db605" xlink:href="wlkp-20210630.xsd#wlkp_ReceivablesunderInvestmentManagementAgreementswithRelatedPartiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_4cc227bc-a9c7-4344-9aae-b793d3d9f6c6" xlink:to="loc_wlkp_ReceivablesunderInvestmentManagementAgreementswithRelatedPartiesCurrent_bc69880b-fcfe-476a-8aa7-b0205e8db605" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_6550e7fd-f4c3-4fd0-8c34-b2a5deded19a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableRelatedPartiesCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_4cc227bc-a9c7-4344-9aae-b793d3d9f6c6" xlink:to="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_6550e7fd-f4c3-4fd0-8c34-b2a5deded19a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_93e79867-0ed4-4f46-bb31-f0b399295ca5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_4cc227bc-a9c7-4344-9aae-b793d3d9f6c6" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_93e79867-0ed4-4f46-bb31-f0b399295ca5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_95f7ee0e-87e8-41b0-bcb6-2e8d75e27afe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_4cc227bc-a9c7-4344-9aae-b793d3d9f6c6" xlink:to="loc_us-gaap_InventoryNet_95f7ee0e-87e8-41b0-bcb6-2e8d75e27afe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_e947a8b2-f5c4-4bb6-b25d-68571795bb98" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_4cc227bc-a9c7-4344-9aae-b793d3d9f6c6" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_e947a8b2-f5c4-4bb6-b25d-68571795bb98" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapital_82bd3a16-1d88-41c7-af81-be44c4fc7ff6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PartnersCapital"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccount_53ace67b-2786-45ec-b1ed-595ed22dbbf2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LimitedPartnersCapitalAccount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapital_82bd3a16-1d88-41c7-af81-be44c4fc7ff6" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccount_53ace67b-2786-45ec-b1ed-595ed22dbbf2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralPartnersCapitalAccount_72626e4f-2843-457f-a8e6-f74aae455dc2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GeneralPartnersCapitalAccount"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapital_82bd3a16-1d88-41c7-af81-be44c4fc7ff6" xlink:to="loc_us-gaap_GeneralPartnersCapitalAccount_72626e4f-2843-457f-a8e6-f74aae455dc2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_83db4aa4-349a-490b-8020-bb02f6f86b57" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapital_55addaf4-368a-41cf-b48e-ad9ea36c70f8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PartnersCapital"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_83db4aa4-349a-490b-8020-bb02f6f86b57" xlink:to="loc_us-gaap_PartnersCapital_55addaf4-368a-41cf-b48e-ad9ea36c70f8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestInLimitedPartnerships_d56ad2fe-84b0-4043-a7ad-9ae5543438c3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MinorityInterestInLimitedPartnerships"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_83db4aa4-349a-490b-8020-bb02f6f86b57" xlink:to="loc_us-gaap_MinorityInterestInLimitedPartnerships_d56ad2fe-84b0-4043-a7ad-9ae5543438c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_eaf32f35-e9d2-4460-acb2-58990b8e6e26" 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_5fba1eaa-cc81-44e3-85b3-32a71c8da6dd" 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_eaf32f35-e9d2-4460-acb2-58990b8e6e26" xlink:to="loc_us-gaap_Liabilities_5fba1eaa-cc81-44e3-85b3-32a71c8da6dd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_a39e2847-503d-4724-8cec-cb6260ab0f6e" 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_eaf32f35-e9d2-4460-acb2-58990b8e6e26" xlink:to="loc_us-gaap_CommitmentsAndContingencies_a39e2847-503d-4724-8cec-cb6260ab0f6e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_f4f1ae77-4f9f-4456-a6d0-02accd657883" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_eaf32f35-e9d2-4460-acb2-58990b8e6e26" xlink:to="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_f4f1ae77-4f9f-4456-a6d0-02accd657883" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_c1641d28-846d-46ce-b588-28de773bacda" 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_cdfe003c-96ed-47fe-b2ae-c82bdd9b62d6" 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_c1641d28-846d-46ce-b588-28de773bacda" xlink:to="loc_us-gaap_LiabilitiesCurrent_cdfe003c-96ed-47fe-b2ae-c82bdd9b62d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_86709390-db16-484e-98db-d731d210680a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_c1641d28-846d-46ce-b588-28de773bacda" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_86709390-db16-484e-98db-d731d210680a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_7a86e275-48b1-4697-89ca-8955b85bd89e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_c1641d28-846d-46ce-b588-28de773bacda" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_7a86e275-48b1-4697-89ca-8955b85bd89e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DueToRelatedPartiesNoncurrent_666bba1d-dd82-457b-8bb0-5daf985b74f7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DueToRelatedPartiesNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_c1641d28-846d-46ce-b588-28de773bacda" xlink:to="loc_us-gaap_DueToRelatedPartiesNoncurrent_666bba1d-dd82-457b-8bb0-5daf985b74f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_4f51a6a0-8e74-4a76-93d8-9702c6df34f3" 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_AccountsPayableCurrent_80dfb791-e662-49f5-8614-1a8d613afe19" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_4f51a6a0-8e74-4a76-93d8-9702c6df34f3" xlink:to="loc_us-gaap_AccountsPayableCurrent_80dfb791-e662-49f5-8614-1a8d613afe19" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_ed775474-0cd7-4e82-aaa9-5f8cc497d94d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_4f51a6a0-8e74-4a76-93d8-9702c6df34f3" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_ed775474-0cd7-4e82-aaa9-5f8cc497d94d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableRelatedPartiesCurrent_51205608-0241-4ca6-8ecd-22a0d1c5ff36" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableRelatedPartiesCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_4f51a6a0-8e74-4a76-93d8-9702c6df34f3" xlink:to="loc_us-gaap_AccountsPayableRelatedPartiesCurrent_51205608-0241-4ca6-8ecd-22a0d1c5ff36" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedStatementsofOperations" xlink:type="simple" xlink:href="wlkp-20210630.xsd#ConsolidatedStatementsofOperations"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedStatementsofOperations" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_ec1c7d25-a289-43cb-8b79-ec3aa28bf79e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2160b042-656d-43fe-8e1d-cf0b78f29d7b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_ec1c7d25-a289-43cb-8b79-ec3aa28bf79e" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2160b042-656d-43fe-8e1d-cf0b78f29d7b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_25cf1e4c-a245-450e-b18c-40c81f4042a3" 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_ProfitLoss_ec1c7d25-a289-43cb-8b79-ec3aa28bf79e" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_25cf1e4c-a245-450e-b18c-40c81f4042a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_a1620645-647a-478f-aa1b-ee6b51883b66" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromRelatedParties_cdbf2fb8-83fc-4635-8b73-09a7ae416a54" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromRelatedParties"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_a1620645-647a-478f-aa1b-ee6b51883b66" xlink:to="loc_us-gaap_RevenueFromRelatedParties_cdbf2fb8-83fc-4635-8b73-09a7ae416a54" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_e358ad22-3aaa-4e0a-aa2c-bd1f747c90e8" 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_CostOfGoodsAndServicesSold_8a2eb525-265d-4037-95c7-ea454592c100" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_e358ad22-3aaa-4e0a-aa2c-bd1f747c90e8" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_8a2eb525-265d-4037-95c7-ea454592c100" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_9e1cbe9a-c631-4d7e-9a7e-f33b48f31964" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_e358ad22-3aaa-4e0a-aa2c-bd1f747c90e8" xlink:to="loc_us-gaap_Revenues_9e1cbe9a-c631-4d7e-9a7e-f33b48f31964" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_91aaaf71-499c-489b-83c8-2e815d601996" 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_ProfitLoss_fffb4257-f70c-4bbc-8bde-c9b6ab09330a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_91aaaf71-499c-489b-83c8-2e815d601996" xlink:to="loc_us-gaap_ProfitLoss_fffb4257-f70c-4bbc-8bde-c9b6ab09330a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_f474338a-5616-46d3-ba0b-ccf66c2762c3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_91aaaf71-499c-489b-83c8-2e815d601996" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_f474338a-5616-46d3-ba0b-ccf66c2762c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdc8467f-859e-4b9a-8806-e4436c4d2bef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_fac67657-fb4c-4a1d-8d04-6ae67b4584a8" 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_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdc8467f-859e-4b9a-8806-e4436c4d2bef" xlink:to="loc_us-gaap_OperatingIncomeLoss_fac67657-fb4c-4a1d-8d04-6ae67b4584a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseRelatedParty_f8e77cb3-aa41-451e-8aa4-4ebdcfdc581a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseRelatedParty"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdc8467f-859e-4b9a-8806-e4436c4d2bef" xlink:to="loc_us-gaap_InterestExpenseRelatedParty_f8e77cb3-aa41-451e-8aa4-4ebdcfdc581a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_d804d39d-a746-4065-882b-0ef2fd5d8215" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdc8467f-859e-4b9a-8806-e4436c4d2bef" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_d804d39d-a746-4065-882b-0ef2fd5d8215" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_c4f4986b-1372-4683-8604-6bae3c471822" 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_GrossProfit_d62aa2fe-2cfc-4550-9165-9d1701d5262d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c4f4986b-1372-4683-8604-6bae3c471822" xlink:to="loc_us-gaap_GrossProfit_d62aa2fe-2cfc-4550-9165-9d1701d5262d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_2bc241db-951e-4f3a-bc67-e38f1b8f31fb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c4f4986b-1372-4683-8604-6bae3c471822" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_2bc241db-951e-4f3a-bc67-e38f1b8f31fb" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="wlkp-20210630.xsd#ConsolidatedStatementsofCashFlows"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedStatementsofCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9a5536b6-c315-4e97-bfa2-690471ecef44" 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_PaymentsToMinorityShareholders_6625ab89-c59c-4430-bce5-eaff4552e903" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToMinorityShareholders"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9a5536b6-c315-4e97-bfa2-690471ecef44" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_6625ab89-c59c-4430-bce5-eaff4552e903" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_03169611-82e5-410d-9896-99162e1754f3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_9a5536b6-c315-4e97-bfa2-690471ecef44" xlink:to="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_03169611-82e5-410d-9896-99162e1754f3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_9a35452c-38a8-4ed5-abee-0937c3c61450" 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_ProfitLoss_8e830d2f-d4b0-4e6e-a46d-d786d3c82817" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_9a35452c-38a8-4ed5-abee-0937c3c61450" xlink:to="loc_us-gaap_ProfitLoss_8e830d2f-d4b0-4e6e-a46d-d786d3c82817" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_41a05b08-d9a8-4ddd-9005-4a460507dc9b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_9a35452c-38a8-4ed5-abee-0937c3c61450" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_41a05b08-d9a8-4ddd-9005-4a460507dc9b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets_7f34bb25-93a3-49df-b2ee-195904b9e152" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_9a35452c-38a8-4ed5-abee-0937c3c61450" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets_7f34bb25-93a3-49df-b2ee-195904b9e152" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_9bef1793-5e90-4f86-b1e8-879842afb7ff" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_9a35452c-38a8-4ed5-abee-0937c3c61450" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_9bef1793-5e90-4f86-b1e8-879842afb7ff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_ee5df15a-27c7-4ed2-be6a-ce0856c39fb3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_9a35452c-38a8-4ed5-abee-0937c3c61450" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_ee5df15a-27c7-4ed2-be6a-ce0856c39fb3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_IncreaseDecreaseInPrepaidExpensesAndOtherCurrentAssets_ac2f759c-d01f-465a-b4a1-b573774d5417" xlink:href="wlkp-20210630.xsd#wlkp_IncreaseDecreaseInPrepaidExpensesAndOtherCurrentAssets"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_9a35452c-38a8-4ed5-abee-0937c3c61450" xlink:to="loc_wlkp_IncreaseDecreaseInPrepaidExpensesAndOtherCurrentAssets_ac2f759c-d01f-465a-b4a1-b573774d5417" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_f1b80656-66f2-4a7b-8870-5f553708e1f8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_9a35452c-38a8-4ed5-abee-0937c3c61450" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_f1b80656-66f2-4a7b-8870-5f553708e1f8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_71a3c37c-fd50-44af-a076-69a9130c1c50" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_9a35452c-38a8-4ed5-abee-0937c3c61450" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_71a3c37c-fd50-44af-a076-69a9130c1c50" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_fe844f07-fc22-4af2-bd99-e8f3e0e2bc88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_9a35452c-38a8-4ed5-abee-0937c3c61450" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_fe844f07-fc22-4af2-bd99-e8f3e0e2bc88" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties_e00aa513-143c-453e-be49-e1bfad92259c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_9a35452c-38a8-4ed5-abee-0937c3c61450" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties_e00aa513-143c-453e-be49-e1bfad92259c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_2ab6a71a-f3e0-4008-8526-435a33ff39be" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_9a35452c-38a8-4ed5-abee-0937c3c61450" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_2ab6a71a-f3e0-4008-8526-435a33ff39be" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8925893c-6c8b-4f89-9962-8a7754bcb67c" 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_e097bd22-86e4-4bbf-9629-e37b436728f1" 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_8925893c-6c8b-4f89-9962-8a7754bcb67c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_e097bd22-86e4-4bbf-9629-e37b436728f1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cf0e4e1d-733c-4480-9b5d-978f4eede14c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8925893c-6c8b-4f89-9962-8a7754bcb67c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cf0e4e1d-733c-4480-9b5d-978f4eede14c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4fd19b74-cab1-4c4e-9108-a3b6c23dfbb9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8925893c-6c8b-4f89-9962-8a7754bcb67c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4fd19b74-cab1-4c4e-9108-a3b6c23dfbb9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_461e139b-c49c-43e5-a869-986223c0ebbe" 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_4ed2f4bc-708d-4e5f-a7c6-eaa7e1684811" 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_461e139b-c49c-43e5-a869-986223c0ebbe" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_4ed2f4bc-708d-4e5f-a7c6-eaa7e1684811" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_MaturitiesofinvestmentswithWestlakeundertheInvestmentManagementAgreement_6a3d322e-e722-48cf-bafc-c84652ff4d6b" xlink:href="wlkp-20210630.xsd#wlkp_MaturitiesofinvestmentswithWestlakeundertheInvestmentManagementAgreement"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_461e139b-c49c-43e5-a869-986223c0ebbe" xlink:to="loc_wlkp_MaturitiesofinvestmentswithWestlakeundertheInvestmentManagementAgreement_6a3d322e-e722-48cf-bafc-c84652ff4d6b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_InvestmentswithWestlakeundertheInvestmentManagementAgreement_40961ee0-720c-48cf-8998-85f8486a6ad1" xlink:href="wlkp-20210630.xsd#wlkp_InvestmentswithWestlakeundertheInvestmentManagementAgreement"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_461e139b-c49c-43e5-a869-986223c0ebbe" xlink:to="loc_wlkp_InvestmentswithWestlakeundertheInvestmentManagementAgreement_40961ee0-720c-48cf-8998-85f8486a6ad1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_CashProvidedbyUsedinInvestingActivitiesOther_2bcd64ad-75a2-400d-9f71-64c646dd7a71" xlink:href="wlkp-20210630.xsd#wlkp_CashProvidedbyUsedinInvestingActivitiesOther"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_461e139b-c49c-43e5-a869-986223c0ebbe" xlink:to="loc_wlkp_CashProvidedbyUsedinInvestingActivitiesOther_2bcd64ad-75a2-400d-9f71-64c646dd7a71" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/AccountsReceivableThirdPartiesAccountsReceivableThirdPartiesScheduleOfAccountsReceivableDetails" xlink:type="simple" xlink:href="wlkp-20210630.xsd#AccountsReceivableThirdPartiesAccountsReceivableThirdPartiesScheduleOfAccountsReceivableDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/AccountsReceivableThirdPartiesAccountsReceivableThirdPartiesScheduleOfAccountsReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_TradeCustomerReceivableNetCurrent_fe1b2f51-ed7e-4f84-ab75-87c222ed5f3e" xlink:href="wlkp-20210630.xsd#wlkp_TradeCustomerReceivableNetCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_90745f7a-b16e-4d70-988b-c70efb12b49a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlkp_TradeCustomerReceivableNetCurrent_fe1b2f51-ed7e-4f84-ab75-87c222ed5f3e" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_90745f7a-b16e-4d70-988b-c70efb12b49a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_70f9c2e6-0560-414f-8369-a448d2a1257d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlkp_TradeCustomerReceivableNetCurrent_fe1b2f51-ed7e-4f84-ab75-87c222ed5f3e" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_70f9c2e6-0560-414f-8369-a448d2a1257d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_dbac3738-d423-4df7-83f6-7923527c9654" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_TradeCustomerReceivableNetCurrent_6b2b9db8-7303-438a-b59c-c00950914326" xlink:href="wlkp-20210630.xsd#wlkp_TradeCustomerReceivableNetCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_dbac3738-d423-4df7-83f6-7923527c9654" xlink:to="loc_wlkp_TradeCustomerReceivableNetCurrent_6b2b9db8-7303-438a-b59c-c00950914326" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_4f00b097-7969-4450-88ca-91ee6c484bb9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherReceivablesNetCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_dbac3738-d423-4df7-83f6-7923527c9654" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_4f00b097-7969-4450-88ca-91ee6c484bb9" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/InventoriesDetails" xlink:type="simple" xlink:href="wlkp-20210630.xsd#InventoriesDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/InventoriesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_5961f60a-899d-4027-ae64-c092b8eef98d" 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_InventoryFinishedGoods_221ff77c-d3d2-4bf9-9883-baac77f897f2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryFinishedGoods"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_5961f60a-899d-4027-ae64-c092b8eef98d" xlink:to="loc_us-gaap_InventoryFinishedGoods_221ff77c-d3d2-4bf9-9883-baac77f897f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWorkInProcessAndRawMaterials_6e8efa47-27ab-4bbb-96a6-63ad94c4e534" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryWorkInProcessAndRawMaterials"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_5961f60a-899d-4027-ae64-c092b8eef98d" xlink:to="loc_us-gaap_InventoryWorkInProcessAndRawMaterials_6e8efa47-27ab-4bbb-96a6-63ad94c4e534" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
