Estimate Your Body Fat Percentage at Home
Body fat percentage is a more useful fitness number than body weight alone, because it shows how much of you is lean tissue versus fat. This free calculator estimates it using the US Navy method, a tape-measure formula trusted for decades in fitness and military settings. You only need a few measurements and a flexible tape.
For men the formula uses height, waist and neck. For women it adds the hip measurement. Enter your values in centimeters or inches and the tool returns a body fat percentage, a category from essential fat to obese, and, if you also enter your weight, your total fat mass and lean mass in the same units.
Take measurements on bare skin, keep the tape snug but not tight, and stand relaxed. Small measurement errors can shift the result a few points, so measure twice and take the average. The tool runs entirely in your browser and needs no account.
How to use it
- Choose your sex and unit (cm or in).
- Enter height, waist and neck, plus hip if you chose female.
- Optionally enter body weight to see fat and lean mass, then calculate.
Frequently asked questions
How does the US Navy body fat method work?
It estimates body fat percentage from a few tape measurements. For men it uses height, waist and neck; for women it adds hip.
How accurate is this body fat calculator?
Tape-based methods are reasonably accurate when measurements are taken carefully, within a few percent. They are estimates, not a medical test.
What measurements do I need?
Your height, waist circumference at the navel, neck circumference below the larynx, and hip at the widest point for women.
What is a healthy body fat percentage?
It varies by sex and age. As a rough guide, men in the fitness range are 6 to 17 percent and women 14 to 24 percent.
This is an estimate for general fitness use, not medical advice. Consult a professional for health decisions.