Health & Fitness
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy method.
How this body fat calculator works
This free online body fat calculator takes the numbers you enter and applies a standard formula for this kind of calculation, showing the result instantly with no page reload. Estimate body fat percentage using the U.S. Navy method.
Everything runs client-side in JavaScript, so your inputs never leave your device — there's no server, no account and no tracking involved in getting your answer.
Frequently asked questions
It's a tape-measure estimate, typically within a few percentage points of more precise methods like DEXA scans — accurate enough to track trends, not exact enough for clinical use.