Body Fat Calculator

01You

Units
Sex

The Navy equations are different for men and women.

02Measurements

Directly below the larynx (Adam's apple).

Men: around the abdomen at the navel. Women: at the narrowest point.

Women only: around the widest part of the buttocks.

Estimated body fat

17.5%

U.S. NAVY CIRCUMFERENCE METHOD

Fat mass
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Lean mass
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Circumference value used
19 in (abdomen − neck)
  • The equations have a reported standard error of about 3–4 body-fat percentage points, and tend to underestimate high body fat and overestimate low body fat (Front Physiol 2023), so treat the result as a range. Measure on bare skin with a non-stretch tape.
  • Military services set their own current body composition procedures and standards; this page uses the 1984 Hodgdon & Beckett equations for general estimates only.
  • This is an estimate for general information, not medical advice. Talk to a doctor or other qualified health professional about your own situation.

Estimated body fat: 17.5% U.S. NAVY CIRCUMFERENCE METHOD

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Calculator by CalcBloc · rates from official sources, checked 2026-10-17.