About Metri
Metri is a free, open-source toolkit for people who take training seriously — accurate calculators and evidence-based guides, with no paywalls and no clutter.
What Metri is
Metri is web-first. Every calculator — 1RM, TDEE, macros, body fat, BMI, FFMI, hydration and plate loading — runs instantly in your browser, free, forever. Alongside them is a growing knowledge base of practical, no-nonsense guides on nutrition, training and recovery.
A native iOS and Android app is in development as an optional extra: the same tools, fully offline, with progress tracking and reminders. You never need it to use Metri — the web is the product.
Free and open source
Metri is MIT-licensed and developed in the open. There are no subscriptions, no locked features and no ads. You can read the code, file issues, suggest features or fork it entirely.
Keeping it open keeps it honest: the formulas behind every result are inspectable, so you can trust what the numbers mean.
Private by design
The calculators do their math locally — your numbers stay in your browser. An account is optional and only exists to sync saved results across devices and with the app.
Who builds it
Metri is built and maintained independently. Contributions are welcome — the best place to get involved is the GitHub repository.