Estimate your body fat percentage using the US Navy method
Body fat percentage is one of the most useful indicators of overall fitness and health, often more meaningful than weight or BMI alone. Unlike BMI, which only considers height and weight, body fat percentage distinguishes between fat mass and lean mass, giving you a clearer picture of your body composition. The US Navy method is a widely recognized circumference-based approach that uses measurements of your neck, waist, and height (plus hips for women) to estimate body fat. While not as precise as hydrostatic weighing or DEXA scans, it provides a reliable and accessible estimate that you can perform at home with just a tape measure.
Body fat ranges differ significantly between men and women due to biological differences. Men typically carry less essential fat and have healthy body fat ranges between 6% and 24%, while women need more essential fat for reproductive health and have healthy ranges between 14% and 31%. Athletes of both genders tend to have lower body fat percentages, though going too low can be dangerous and impair immune function, hormone production, and overall health. The categories shown in this calculator, from essential fat through obese, are based on guidelines from the American Council on Exercise.
For the most accurate results with the US Navy method, measure your circumferences first thing in the morning on bare skin. Use a flexible tape measure and keep it snug but not compressing the skin. Measure your neck just below the larynx, your waist at the narrowest point (typically at the navel for men or the smallest circumference for women), and hips at the widest point of the buttocks. Taking multiple measurements and averaging them improves accuracy. Track your body fat percentage over time rather than focusing on a single reading, as trends provide much more useful information about your fitness progress.