Privacy

Last updated 31 October 2026.

Your figures

The calculator runs in your browser. The figures you type aren't sent to us or anyone else, and we don't store them.

If you tick "Remember my figures on this device", they're saved in your browser's local storage so they're there next time. They stay on that device only. Untick the box to delete them, or clear your browser's site data.

Cookies and tracking

This site doesn't use cookies or adverts. If that changes, this page will be updated first and you'll be asked for consent where the law requires it.

Visitor statistics

We use Cloudflare Web Analytics to count page views and see which pages are useful. It doesn't use cookies, doesn't store anything on your device and doesn't track you across other websites. See Cloudflare Web Analytics.

Hosting

The site is hosted on Cloudflare Pages. Like any web host, Cloudflare processes technical information such as IP addresses to deliver pages and protect the site from attacks.

Contact

Questions about privacy: [email protected].