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Body Fat Calculator
Estimate your body fat percentage from simple tape measurements using the US Navy circumference method.
Body fat from tape measurements
Body fat: —
Category: —
Fat mass: —
Lean mass: —
How to use the Body Fat Calculator
- Pick your sex and enter your height and weight.
- Measure your neck and waist, plus your hips if you are female.
- Read the estimated body fat, category, fat mass and lean mass.
Features
- US Navy circumference method
- Separate male and female formulas
- Body fat category with fat and lean mass
- Runs locally, no uploads
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Frequently Asked Questions
Common questions about the free online body fat calculator.
Measure your neck, waist and height in centimetres, plus your hips if you are female, and
enter them to get a US Navy estimate.
It uses the US Navy circumference method, which estimates body fat from neck, waist, height
and hip measurements rather than callipers.
Measure at the navel for men and at the narrowest point of the waist for women, keeping the
tape level and snug but not tight.
It is usually within a few percent of a DEXA scan, so treat the number as a useful estimate
rather than a clinical measurement.
For men about 14 to 24 percent is average and 6 to 13 percent is athletic. For women the
healthy band is higher, near 21 to 31 percent.
The female formula includes hip circumference because fat distribution differs by sex, so
that measurement improves the estimate.
This calculator takes centimetres and kilograms. Multiply inches by 2.54 for centimetres and
divide pounds by 2.2 for kilograms.
No. It is an estimate for general information only and not medical advice, so speak to a
health professional about your own situation.
Athletes with very low body fat are often underestimated, because circumference formulas were
built from a general population sample.
Last updated: October 10, 2026