Enter your body measurements below to calculate body fat percentage (BF%), fat mass, and lean body mass (LBM). Uses the U.S. Navy Method, accurate to within +/-2-3% of hydrostatic weighing.
Body fat percentage (BF%) is the proportion of fat in your total body weight. It provides a more accurate assessment of body composition and health than BMI or weight alone.
The U.S. Navy Method is one of the most widely used body fat estimation techniques, with accuracy close to hydrostatic weighing (+/-2-3% error margin). It uses simple circumference measurements to estimate body density.
Women store fat differently than men, so the formula requires an additional hip measurement for accuracy. The male formula uses height, neck, and waist only.
Healthy ranges: Men 6-24% (athletes 6-13%, average 14-24%), Women 14-31% (athletes 14-20%, average 21-31%). Both too high and too low body fat can be unhealthy.
Lean Body Mass (LBM) is your total body weight minus fat mass. It includes muscle, bones, organs, and water. Higher LBM boosts metabolism and helps maintain healthy body composition.