Body Fat Calculator
US Navy body fat estimate
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About this calculator
This uses the US Navy circumference method, which needs only a tape measure. Measure the neck below the larynx and the waist at the navel (and hips at the widest point for women).
The formula
Men: 495 ÷ (1.0324 − 0.19077·log10(waist − neck) + 0.15456·log10(height)) − 450
Worked exampleMan, 180 cm, neck 38 cm, waist 85 cm → roughly 16% body fat.
Frequently asked questions
How accurate is it?
Within a few percentage points for many people, but DEXA or hydrostatic tests are more precise.
Where do I measure?
Waist at the navel for men and the narrowest point for women; hips at the widest point.
What is a healthy range?
Roughly 10–20% for men and 18–28% for women, depending on age and goals.
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