Calculator inputs
Calculator values are processed in your browser. We do not send them to a backend, save them to an account or include them in analytics. Closing or reloading the page resets unsaved input unless you opened a shared URL.
Shared links and downloaded reports
Choosing Share creates a URL fragment that contains the values you entered. Anyone receiving that link can read those values. Only share links with people you intend to see them. CSV exports are generated locally and saved to your device.
Cookies, hosting and third parties
ShopMathLab uses Google Analytics to understand how visitors use this site. Google Analytics sets cookies and collects information such as pages viewed, approximate location and device type; IP addresses are anonymized before storage. We do not use this data to identify individual visitors, and calculator inputs are never included in it. The hosting service may separately process routine request information, such as IP addresses and browser details, to deliver and protect the website. External source links take you to sites governed by their own privacy policies.
Your choices
Most browsers let you block or delete cookies through their settings, and browser extensions can block analytics scripts entirely. Doing so does not affect any calculator's functionality, since calculations always run locally in your browser regardless of analytics.
Updates
This policy was last updated September 23, 2026 to reflect the addition of Google Analytics. It must be reviewed again before adding accounts, advertising, subscriptions or other services that process personal information.