Body Fat Calculator
Estimate your body-fat percentage using the US Navy tape method — accurate to ± 3% for most adults. Enter height and girth measurements to see your ACE category.
How Body Fat Calculator works
Height, neck, waist (and hip for women) with a soft cloth tape.
Metric or imperial — the formula converts internally.
Body-fat % + your ACE category. The bar shows where you sit vs athletes / fitness / acceptable / obese.
Frequently asked
How accurate is the US Navy method?+
Accurate to ± 3% for most adults. More accurate than BMI for lean or muscular people. DEXA scans are the gold standard for research.
Is this the same as the Army Body Fat calculator?+
The Army and Navy use very similar tape-measure formulas — this calculator follows the Navy circumference method, which the Army also references.
Where do I measure the waist?+
Around the navel for men; at the narrowest point for women. Neck is measured just below the larynx.
Why do women need a hip measurement?+
The female formula includes hip circumference to account for typical fat-distribution differences.