What is Metri?
A quick tour of the open-source fitness toolkit: calculators and a knowledge base.
1 min read
Written & reviewed by Ricardo Tapia·Last updated
Metri is an open-source fitness companion built for people who actually train. It bundles the tools serious lifters reach for (evidence-based calculators and a no-nonsense knowledge base) into one fast, private, ad-free package.
What you get
- Calculators that run instantly in your browser: 1RM, TDEE, macros, body fat, FFMI, hydration and more. The same formulas power the mobile app.
- A knowledge base like this one: short, practical guides with no fluff.
Everything here is free and open source. The mobile app works fully offline; your data never leaves your device.
Who it's for
Whether you train for strength, hypertrophy, or general health, Metri gives you the numbers without the guesswork, and explains what they mean.
How to use the docs
Start with the calculator guides if you want to understand a specific number, or read the training and nutrition sections to build a mental model. Each article links to the relevant tool so you can go from "what" to "how" in one click.
This is educational content, not medical advice. For anything health-related, talk to a qualified professional.
Educational content only. Not medical advice; consult a professional for your situation.