HEALTH & FITNESS
Body Fat Calculator
Estimate body-fat percentage with the U.S. Navy method.
100% free
No sign-up
Private — runs in your browser
Instant results
KEY TAKEAWAYS
- Estimate body-fat percentage with the U.S. Navy method.
- Free to use — no sign-up, no account and no usage limits.
- Runs entirely in your browser, so the numbers you enter stay private.
- Works on desktop and mobile with instant, accurate results.
Last updated: June 2026
About the Body Fat Calculator
Enter a few tape measurements (neck, waist, and hip for women) plus your height to estimate body-fat percentage, fat mass and lean mass.
Frequently asked questions
How accurate is the Navy method?
It's typically within a few percent of a DEXA scan for most people — good enough to track changes over time.
Free online tool from ConvertFleet. Calculations run entirely in your browser — nothing you type is sent anywhere. Results are estimates for general guidance only.