Body Fat Calculator

Your details

Used for the BMI-method cross-check and your age-based ideal body fat.
yr
cm
Measure around the neck, just below the larynx.
cm
Men: at the navel. Women: at the narrowest point.
cm
Enter weight to also get fat mass, lean mass and the BMI cross-check.
kg
Body fat (Navy method)
20.1%

U.S. Navy circumference estimate

Body fat (BMI method)21%
Fat mass16.1
Lean body mass63.9
Ideal body fat for your age12.7%
Fat to lose to reach ideal6
20.1% %
Essential<5Athletic5-13Fitness13-17Average17-24High24+

Your estimated body fat is 20.1%, average for men.

  • This is the U.S. Navy circumference estimate, a quick screen, less exact than a DEXA or hydrostatic measurement.
  • The BMI method agrees closely (21.0%), so this estimate is fairly reliable.
  • That works out to about 16.1 kg of fat and 63.9 kg of lean mass.

Next stepTo reach the 12.7% ideal for your age, you would lose roughly 6.0 kg of fat.

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