Body Fat Calculator
Calculate your body fat percentage online free with the U.S. Navy tape method in cm or inches. Free online body fat calculator with lean mass and ACE chart.
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Part of the toolkit
How to use Body Fat Calculator
- 1Choose male or female and cm/kg or inches/pounds
- 2Enter age, height and weight, then measure your neck and waist (and hips for women) with a soft tape
- 3Click Calculate body fat to see your percentage, ACE category, fat mass and lean body mass
Frequently asked questions
How accurate is the Navy body fat method?▾
Used by the U.S. military, it is typically within about 3–4 percentage points of lab methods like DEXA when measurements are taken carefully. Measure 2–3 times and use the average.
What is the Navy body fat formula?▾
For men (cm): 495 ÷ (1.0324 − 0.19077 × log10(waist − neck) + 0.15456 × log10(height)) − 450. For women it uses waist + hip − neck with coefficients 1.29579, 0.35004 and 0.22100.
What is a healthy body fat percentage?▾
According to the American Council on Exercise, 14–24% is fit to average for men and 21–31% for women. Essential fat is about 2–5% for men and 10–13% for women.
Where do I measure my waist?▾
Men measure horizontally at the navel; women at the narrowest part of the waist. Measure the neck just below the Adam's apple and, for women, the hips at their widest point.
What is lean body mass?▾
Everything that is not fat — muscle, bone, organs and water. It is your weight minus fat mass and is useful for setting protein and calorie targets.
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