Calculator

Body Fat Calculator

Body fat percentage by the U.S. Navy tape method, with fat and lean mass.

years
Gender
cm
ft
in
kg
lb

Below the larynx

Men: at the navel. Women: narrowest point

Widest point

Measure in centimetresinches, tape snug but not pressing the skin.

Results update as you type.

Body fat (U.S. Navy method)

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Fat mass
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Lean mass
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Ideal body fat for your age
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Fat to lose to reach it
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Estimate from BMI
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The U.S. Navy method

The U.S. Navy estimates body fat from height and the neck and waist (plus hip for women) using log formulas. It is usually within 3–4% of lab methods, which is good enough to track progress over time.

Categories (American Council on Exercise)

  • Essential fat: women 10–13%, men 2–5%
  • Athletes: women 14–20%, men 6–13%
  • Fitness: women 21–24%, men 14–17%
  • Average: women 25–31%, men 18–24%
  • Obese: women 32%+, men 25%+