Body Fat Calculator
Estimate your body fat percentage using the US Navy method with simple measurements.
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About this calculator
Body fat percentage is a better measure of fitness than weight or BMI alone. It tells you how much of your body is fat versus lean mass (muscle, bone, organs). Our body fat calculator uses the US Navy method — a widely used formula that estimates body fat percentage from simple circumference measurements. No expensive equipment needed.
The formula, explained simply
The US Navy formula uses different calculations for men and women. For men: we use neck and waist measurements. For women: we use neck, waist, and hip measurements. All measurements are in centimeters and taken at specific points. The formula was developed by the US Navy to estimate body density, which is then converted to body fat percentage. The result includes your estimated body fat percentage, the category (Essential Fat, Athletes, Fitness, Acceptable, or Obese), and your estimated fat mass and lean mass in kilograms.
When you would use this
Fitness enthusiasts track body fat changes during training programs. Athletes monitor their competition weight. People on weight loss journeys get a more meaningful metric than just the scale. Personal trainers assess client progress. Doctors use it alongside other health markers for a complete picture.