Using the tools
ShopMathLab provides free educational calculators for ecommerce planning. You may use their outputs for your own business analysis, subject to the limitations described on each page. No registration or purchase is required.
Estimates and availability
Results depend on your inputs and the assumptions shown. We do not guarantee agreement with a marketplace invoice or that the service will always be available. Verify material decisions against official information and your business records.
Appropriate use
Do not misuse the website, interfere with availability or present its estimates as certified accounting, tax or legal advice. Link to the original tool when sharing public references.
External websites
We link to official marketplace references to help you verify assumptions. External providers control their own content and terms. ShopMathLab is not affiliated with, endorsed by or an official product of those marketplaces.