Body Fat Calculator
Estimate body fat percentage using the US Navy circumference method.
Inputs
Result
Body fat (estimate)
16.9%
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Visual breakdown
EssentialAthleteFitnessAverageHigh
Your value: 16.9%
Formula
Male: 495 / (1.0324 − 0.19077·log₁₀(waist−neck) + 0.15456·log₁₀(height)) − 450. Female: uses waist+hip−neck with different coefficients. Accepts metric (cm) or imperial (in); imperial values are converted internally.
Example
Male, 180cm, neck 38cm, waist 86cm ≈ ~17% body fat.
Common examples
Male, neck 38, waist 86 cm, 180 cm
≈ 17–19% body fat.
Female with hip measurement
Add hip circumference for accuracy.
Tape vs scales
Tape methods estimate; scales vary by hydration.
Frequently asked
How accurate is the Navy method?
Within ~3–4% for most people. DEXA and underwater weighing are more precise but harder to access.
Where do I measure?
Neck just below the larynx, waist at the navel (men) or narrowest point (women), hips at widest.
Why does sex matter?
Healthy fat ranges and the formula coefficients differ between men and women.
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More health →This calculator is for general information only and is not medical advice.