Body Fat Calculator
Estimate your body fat percentage using the US Navy tape-measure method from your height, neck, waist, and hip measurements.
Estimated body fat
16.4%
Fitness
Uses the US Navy tape-measure method. Measure your neck just below the larynx, your waist at the navel, and (for the female formula) your hips at their widest point, for best accuracy.
How the Body Fat Calculator works
Using your height, neck, and waist measurements (plus hip for the female formula), the calculator applies the US Navy circumference method — a logarithmic formula developed for military fitness assessments — to estimate body fat percentage without special equipment.
Frequently asked questions
How accurate is the US Navy method?
It's typically accurate within about 3–4% body fat for most people compared to more precise methods like DEXA scans — accurate enough for tracking trends over time.
Where exactly should I measure?
Neck: just below the larynx (Adam's apple). Waist: at the navel. Hip (for the female formula): at the widest point of the hips. Measure snugly but without compressing the skin.
Why does the formula differ by gender?
Body fat distribution differs between men and women on average, so the US Navy method uses separate formulas — and an additional hip measurement — for women.