Our Mission
We believe that understanding your body composition should be simple, accurate, and free. Too many people rely on outdated or misleading metrics like BMI alone, while professional tools like DEXA scans or hydrostatic weighing are expensive and hard to access.
That's why we created Body Fat Calculator — a completely free online tool that brings military-grade accuracy (the US Navy method) to anyone with a measuring tape and a few minutes.
Our goal is to help you track real progress, make informed fitness decisions, and achieve sustainable health improvements without guesswork.
Why We Focus on the US Navy Method
The US Navy body fat calculation formula is widely regarded as one of the most accurate non-laboratory methods available. Validated against underwater weighing with ~93.5% accuracy and only a ±3.5% error margin, it's trusted by military forces, fitness professionals, and researchers worldwide.
We chose it as our primary method because it strikes the perfect balance: highly accurate, completely non-invasive, and requires no special equipment beyond a simple tape measure.
We also offer complementary methods (BMI estimation and Katch-McArdle) so you can compare results and choose what works best for your situation.
What Makes Us Different
100% Free
No ads, no signups, no hidden fees. Everything is completely free forever.
Science-First
All formulas are based on peer-reviewed research and validated methods used by professionals.
Privacy Focused
Your data never leaves your device. All calculations happen in your browser.
Accessible
Works on any device, supports multiple languages, and requires no special tools.
Transparent
We show you the exact formulas and explain how everything works.
Regularly Updated
We continually improve accuracy, add features, and expand language support.
Ready to Track Your Progress?
Use our accurate calculator today and start understanding your body composition like never before.
Calculate Body Fat Now →