Privacy

The short version: the calculator runs in your browser, and we only keep anything if you give us your email.

The calculator

Your age, height, weights and the rest are worked out on your own device. They aren’t sent anywhere while you use the calculator. Your browser remembers them so they’re there when you come back; clearing your browser’s data for this site removes them.

If you leave your email

We keep your email address with the calculator answers you had at the time, the country your connection came from, and the ad or link that brought you, if there was one. We use them to send you the beta link and news about the app, and to understand which ads bring people who find the idea useful. Nothing else, and we don’t sell or share them.

They’re stored with Cloudflare, which runs this site.

Removing your details

Email the address you heard from us at and ask, and we’ll delete everything we hold about you.

Cookies

The site sets no cookies and runs no third-party trackers.

Updated 9 November 2026.