US Navy Method Body Fat Calculator
Estimate your body fat percentage from tape measurements with the US Navy method, see your ACE category and fat/lean mass — right in your browser.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the body fat calculator framed around what actually makes it useful: the US Navy circumference method, a formula developed for military fitness assessments precisely because it needs nothing more than a tape measure — no skinfold calipers, no underwater weighing, no DEXA scan.
The formula works entirely from logarithms of a few circumference measurements: height, neck and waist for men, with hip added for women. Because every input is a simple tape-measure reading, this method is what most people can realistically repeat at home week after week to track a trend, rather than relying on lab equipment they don't have access to.
Enter your measurements to get your body fat percentage, its ACE category, and — if you add your weight — a fat mass and lean mass split in kilograms. Expect roughly ±3–4% margin of error versus a DEXA scan, which is normal for any circumference-based estimate and still plenty precise for tracking your own progress over time.
Example. Male measurements of 180 cm height, 38 cm neck and 90 cm waist display 19.8%.
Limit. Height must be 80–250 cm, the male formula requires waist greater than neck, the female formula also requires hip, and a result outside 0–75% is rejected.