Privacy Policy

Last updated 7 August 2026

This calculator runs entirely in your browser. There are no accounts, no sign-up, and no server to send anything to.

What we collect

Nothing. We operate no backend, no database, and no analytics. We cannot see the numbers you type, because they never leave your device.

Data stored on your device

Your saved records and input values are kept in your browser's local storage so the page can restore them on your next visit. This data stays on your computer. Clearing your browser's site data for this site deletes it permanently, and we keep no copy.

Cookies and tracking

We set no cookies, use no advertising or analytics trackers, and load no third-party scripts, fonts, or images. The page makes no external network requests.

Sharing

We have no data to share, sell, or disclose. There is no third party involved.

Contact

Questions: senlin.xue@gmail.com