Privacy

The short version: your measurements never leave your device.

What happens to my numbers?

Nothing leaves your browser. The calculator is a static web app — when you type a measurement, the math runs locally in JavaScript on your device. There is no backend that receives it, no database, and no log of it anywhere.

What about the shareable link?

When you share a result, your numbers are encoded into the URL itself (e.g. ?u=cm&l=15&g=12). Whoever opens that link recreates the same result in their own browser. We never see it.

Tracking & cookies

Cocksure ships without behavioural tracking or advertising cookies.

Not medical advice

This site is for education and curiosity. It does not diagnose anything. For health concerns, see a qualified clinician.