Body Fat Calculator (US Navy)
Estimate body fat percentage using the US Navy circumference method — a tape-measure technique requiring only neck, waist, height (and hip for women).
Inputs
Just below the larynx; tape parallel to floor.
Men: at navel. Women: at narrowest point.
At the widest point of the hips. Leave any value for men — it’s ignored.
Body fat percentage
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Category (US Navy)
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Lean body mass %
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About Body Fat Calculator (US Navy)
Accuracy
The US Navy method is within about 3% of more accurate methods (DEXA, hydrostatic weighing) for most people. It works because waist size correlates strongly with body fat.
How to measure
Use a flexible tape, no compression. Stand relaxed, exhale normally. Measure neck just below the larynx, waist at the navel (men) or narrowest point (women), hip at the widest point (women only).
Limits
Less accurate for very lean or very muscular people, or those with unusual fat distribution. Pregnancy distorts measurements. Use it as a tracking tool — relative changes are reliable even if the absolute number is approximate.