Body Fat Calculator
Estimate your body fat percentage with the U.S. Navy method using height and tape measurements — free online. — free, fast and private.
How to use Body Fat Calculator
- Choose your sex and enter your height, waist and neck measurements in centimetres.
- Women also enter a hip measurement.
- Click Calculate Body Fat to see your estimated percentage.
Note: this tool runs in your browser. Nothing is uploaded.
Disclaimer: this tool gives an estimate for general information only. It is not medical advice. Talk to a doctor or other qualified health professional before making any health decision.
Frequently Asked Questions
How does the Navy body fat method work?
It estimates body fat from tape measurements — height, waist and neck for men, plus hip for women — using a formula developed by the U.S. Navy. It is a useful estimate, but less accurate than a DEXA scan.
Is this tool free to use?
Yes, it is 100% free with no sign-up. Your data stays in your browser.
Is my data uploaded or stored?
No. This tool runs entirely in your browser — nothing you enter is uploaded to a server.
Can I use it on my phone?
Yes, it is fully mobile-friendly and works in any modern browser on phone, tablet or computer.