Privacy
The short version: what you type stays on your device.
Your numbers stay in your browser
All the calculators run entirely in your browser. Altitudes, pressures and recipe amounts you type are never sent to us or anyone else. The site never asks for your location.
What is stored on your device
The site keeps a few things in your browser's local storage so they are ready next time: your colour theme, your unit choices and the last values you entered on each calculator. They never leave your device; clearing this site's data in your browser removes them.
Page view counts
We use Cloudflare Web Analytics to count page views and see which pages are useful. It does not use cookies, does not track you across other sites, and never receives what you type or choose in the tools.
Hosting
The site is served by Cloudflare. Like any web host, Cloudflare processes your IP address and browser details to deliver pages and protect the site from abuse; see Cloudflare's privacy policy.
Links to other sites
Links to other websites, including the sources we cite and the tools we recommend, are ordinary links. Those sites have their own privacy policies.