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Body Fat Calculator
Estimate your body fat percentage with the U.S. Navy circumference method.
Enter your measurements to estimate your body fat percentage.
Formula
U.S. Navy method — men: 495 ÷ (1.0324 − 0.19077·log₁₀(waist − neck) + 0.15456·log₁₀(height)) − 450
How to calculate
- 1Measure your neck below the larynx and your waist at the navel (men), or neck, waist and hips (women), with a soft tape.
- 2Subtract neck from waist (and hips for women) to get the key circumference term.
- 3Apply the Navy logarithmic formula above for your sex, in centimetres.
- 4Compare the result to fitness ranges: roughly 10–20% for men and 18–28% for women.
How to use this calculator
- 1Select your sex and unit system.
- 2Enter your height and the required tape measurements.
- 3Your body fat percentage and category appear instantly.
- 4Re-measure monthly under the same conditions to track the trend.
Examples
Male example
175 cm, neck 38 cm, waist 85 cm → about 15.5% body fat — the 'fitness' range.
Female example
165 cm, neck 32 cm, waist 74 cm, hips 95 cm → about 24% body fat — mid 'average' range.
Common questions
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