How it works
The US Navy method estimates body fat from height and neck and waist circumference (plus hips for women). Typical error is 3-4 points.
Body fat calculator
Estimate your body fat with a tape measure and see your weight at your target without losing muscle.
Reviewed on
cm
kg
cm
cm
%
Estimated body fat
17,2%
Fit
- Fat mass
- 13,8 kg
- Lean mass
- 66,2 kg
Indicative estimate. Not a substitute for advice from a health professional.
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How to measure
Measure in the morning, fasted, without squeezing the tape. Neck just below the Adam’s apple, waist at the navel, hips at the widest point.
Worked example
Man, 180 cm, 80 kg, neck 38 cm, waist 85 cm, target 12%. Formula: 495 / (1.0324 − 0.19077 × log10(waist − neck) + 0.15456 × log10(height)) − 450.
| Metric | Result |
|---|---|
| Body fat | 16.1% (fit) |
| Fat mass | 12.9 kg |
| Lean mass | 67.1 kg |
| Weight at 12% body fat | 76.3 kg |
FAQ
Is it better than a smart scale?
It is usually as reliable or better than home bioimpedance scales. Measure the same way each time and watch the trend.
What is a healthy range?
Roughly 10-20% for men and 18-28% for women.