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Body Fat % Calculator

Estimate body fat percentage using the US Navy circumference formula — needs only a tape measure.

Estimated body fat

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Category
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Method
US Navy
Circumference methods are rough — typically within ±3% of DEXA scan results. Take measurements at the smallest part of the waist (just above the navel for men, narrowest point for women), at the widest part of the hips, and just below the larynx for the neck.

What this calculates

The US Navy formula uses tape-measure circumferences to estimate body-fat percentage — practical when you don't have access to a DEXA scan or calipers. Men need neck and waist; women add hip. Categories follow ACE (American Council on Exercise) bands: essential fat, athletes, fitness, average, obese.