Body fat percentage calculator (US Navy method)
Measure your waist, neck (and hips for women) to estimate body fat %, fat mass and lean mass.
Fill in the form — the result appears here instantly
ℹ️ Results are estimates for planning. Real figures can differ with your situation and your bank or employer.
How it works: Body fat calculator
Measure the waist at the navel (women: the narrowest point), the neck just below the larynx and the hips at their widest, in centimetres. The US Navy formula estimates body fat from these, within about ±3–4%.
Typical ranges (ACE): men 14–17% fit, 18–24% average; women 21–24% fit, 25–31% average. It's more meaningful than BMI for muscular people.
FAQ
Where do I measure my waist?
Men at the navel, women at the narrowest point, standing relaxed after breathing out.
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