About Health Tools

Fast health and fitness calculators for body fat, ideal weight, macros, hydration, one-rep max, running pace, pregnancy and more — 100% in your browser with no uploads or signup.

Privacy-first by design

Unlike most online tools that upload your files to a server, Health Tools does all the work right inside your browser with modern JavaScript and WebAssembly. That means your files are never sent anywhere — it's faster, works offline once loaded, and keeps your data completely private.

Free forever

All tools are free to use. The site is supported by unobtrusive advertising so we can keep building and maintaining useful utilities.