The US Navy circumference method estimates body fat percentage from simple tape measurements — no calipers or scans needed. Accurate to within about 3%.
All calculations run locally in your browser. Nothing is uploaded to any server.
Validated circumference formula used by the US military, within ~3% of DEXA.
See where you fall: essential, athlete, fitness, average or obese ranges.
Get fat mass and lean body mass in kg to guide training goals.
Pair your body fat % with calorie targets and ideal weight.