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Body Fat %
Body fat percentage using the US Navy circumference method.
Inputs
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Result
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Enter values and press Calculate — the result appears here.
How it works
The formula behind this calculator.
US Navy: BF% = 86.010·log10(waist−neck) − 70.041·log10(height) + 36.76 (M)
- waist, neck
- Circumferences at the waist and neck (cm)
- height
- Standing height (cm)
The US Navy method uses circumference measurements to estimate body-fat percentage. Skinfold calipers or DEXA scans are more accurate but require equipment.
Example: Male, 100cm waist, 40cm neck, 180cm tall → ~22% body fat
Ref: Hodgdon & Beckett (1984)
Tips
- 💡 Skinfold calipers are accurate to within 3–4% in trained hands. Bioelectrical impedance can vary day to day with hydration.
- 💡 DEXA scans are the gold standard for body-fat percentage.