Estimate your body fat percentage using the accurate US Navy method. Get your fat mass, lean mass, and health category.
This calculator uses the US Navy Circumference Method, developed by the US Navy for fitness assessments. It uses neck, waist (and hip for women), and height measurements to estimate body fat percentage.
This method is reasonably accurate (within 3–4%) for most people and requires only a tape measure. For clinical-grade accuracy, methods like DEXA scans or hydrostatic weighing are more precise but require special equipment.
Two people can weigh the same but have very different body compositions. An athlete may have more muscle and less fat than a sedentary person of identical weight and BMI.
Tracking body fat percentage gives a clearer picture of your fitness and health than weight or BMI alone. It helps you distinguish between fat loss and muscle loss during a diet.