📉Body Fat Calculator
Estimate body fat % (US Navy method).
Disclaimer: These tools are for general information and educational use only and are not medical advice, diagnosis or treatment. Individual health needs vary. Always consult a qualified doctor or healthcare professional before making health decisions.
About the Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy circumference method from your height, neck, waist (and hip). Free body fat calculator. Estimates only — not medical advice.
How to use the Body Fat Calculator
- 1Enter your details (such as height, weight or age) into the Body Fat Calculator.
- 2Pick your preferred units and any relevant options.
- 3Read your estimated result and the guidance shown below it.
- 4Results are indicative only — always consult a professional for medical decisions.
Why use this tool?
Private by design
The Body Fat Calculator runs entirely in your browser — nothing you enter is uploaded to a server.
Free, no signup
Use it as much as you like. There's no account, no paywall and no watermark.
Fast & instant
Results appear the moment you type or click — no waiting, no page reloads.
Works anywhere
Any device or browser, even offline once the page has loaded.
Frequently asked questions
How is body fat estimated?＋
It uses the U.S. Navy circumference method based on your height, neck and waist (and hip for women). It's an estimate, not a clinical measurement.