Body Fat Percentage Calculator
Estimate body fat percentage with the U.S. Navy tape method. Enter height, neck and waist (plus hip for women) in metric or imperial. Free, no signup.
| Method | U.S. Navy circumference |
|---|
The U.S. Navy tape method estimates body fat from circumferences and height. It's within a few points of a DEXA scan for most people, but a poor tape measurement throws it off.
⚕️ This is an educational estimate, not medical advice. Formulas are population averages and can't account for your full health picture — talk to a doctor or registered dietitian before making decisions about diet, weight or training.
How this calculator works
The U.S. Navy method estimates body fat from circumference measurements and height using log-based equations. Men use neck and waist; women add the hip measurement. Measure the waist at the navel and the neck just below the larynx, snug but not compressing the skin.
Because it relies on a tape measure, technique matters — measure the same spots the same way each time. For tracking change over weeks it's more useful than any single reading.