Updated 17 September 2026

Privacy

The calculators

Every calculation runs in your browser. The numbers you type into a calculator are not sent to us. A share link carries your numbers inside the link itself, so they go only where you send that link.

Feature requests

We store what you type, which page you were on, the date, and a one-way hash of your IP address. The hash only exists to limit how many requests one person can send in a day, and it cannot be turned back into an address. It is held in a Cloudflare database, because Cloudflare runs this site; nobody else receives it, and none of it is published.

We delete anything older than 180 days. That clear-out runs when a new request arrives, so in a quiet stretch an old one can sit past the 180 days until the next request comes in. Please leave out personal or health details.

Analytics

This site asks whether you will allow Google Analytics. If you say no, or never answer, no analytics cookies are set and no Google script loads. If you say yes, Google receives the address of the pages you view — never your inputs or your results. You can change that answer at any time from Analytics preferences.

The rules these pages are built under are in the editorial policy.