Body Fat Calculator

Estimate your body fat percentage and fat mass from age, sex, height, and weight. Use BMI-based or U.S. Navy tape formulas.

Inputs

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Sex

Female Male

Choose the calculation method

American Diabetes Association (most common) U.S. Navy (most precise) BMI (least precise)

ADA and BMI use a BMI-based equation. U.S. Navy uses tape measurements (neck/waist/hip) plus height.

Age

Choose years only, years+months, or years+months+days. The calculator converts it to a single value in years.

Height

ft in

m cm

Pick a height unit. For ft/in or m/cm, enter each part in the extra fields shown below.

Body weight

Neck circumference

ft in

m cm

Measured from just under the larynx.

Waist circumference

ft in

m cm

If you're male, measure from around the navel. If you're female, measure around the narrowest part of the waist.

Hip circumference

ft in

m cm

Measure around the widest part of the buttock or hip.

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Enter your details to see results.

Estimated body fat

Body fat category

Extremely low <10%

Essential fat 10–13%

Athletes 14–20%

Fitness 21–24%

Average 25–31%

Obese 32%+

Marker shows your estimated value on a 0–40% scale (values above 40% are capped at the right edge).

Body fat weight

Estimated weight of the fat in your body.

Show formula

Formula

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