Body Composition
Body Fat Calculator — US Navy Method
Estimate your body fat percentage using the US Navy circumference method.
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US Navy Body Fat Formula
The US Navy method uses body circumference measurements and is one of the most practical and accurate field methods for estimating body fat percentage.
Formula
Men: BF% = 495 / (1.0324 − 0.19077 × log10(waist − neck) + 0.15456 × log10(height)) − 450
Women: BF% = 495 / (1.29579 − 0.35004 × log10(waist + hips − neck) + 0.22100 × log10(height)) − 450
Women: BF% = 495 / (1.29579 − 0.35004 × log10(waist + hips − neck) + 0.22100 × log10(height)) − 450
How to Measure Correctly
- Neck: Measure below the larynx, sloping slightly downward at the front
- Waist (men): Measure at the navel level
- Waist (women): Measure at the narrowest point
- Hips (women only): Measure at the widest point
Tip: Take measurements in the morning before eating. Use a flexible tape measure and keep it level around your body.