Estimate your body fat percentage using the U.S. Navy method. Enter your measurements for an instant calculation.
Body fat percentage is a more accurate health indicator than BMI because it measures actual fat mass relative to total body weight, rather than just comparing weight to height. While BMI can misclassify muscular athletes as overweight, body fat percentage distinguishes between lean mass (muscle, bone, organs) and fat tissue. This calculator uses the U.S. Navy body fat formula — a tape-measurement method proven accurate to within 3–4% of DEXA scans. Healthy body fat ranges vary by sex and age: for men, 10–20% is generally healthy, while women naturally carry more fat (18–28% healthy range) due to physiological needs like hormonal function and reproduction.
The U.S. Navy method used here has been validated to within 3–4% of DEXA (dual-energy X-ray absorptiometry), the gold standard. For most people, it provides a reliable estimate without expensive equipment.
For men: Essential fat 2–5%, Athletes 6–13%, Fitness 14–17%, Acceptable 18–24%, Obese 25%+. For women: Essential 10–13%, Athletes 14–20%, Fitness 21–24%, Acceptable 25–31%, Obese 32%+.
Women naturally store more fat due to hormonal requirements and reproductive functions. Essential fat (minimum needed for health) is ~3–5% for men and ~10–12% for women.
BMI only uses height and weight, missing body composition. A muscular person can have a 'high' BMI but healthy body fat. This calculator provides a more accurate health picture.
Measure at the narrowest point, usually around the navel, after exhaling normally. Keep the tape horizontal and snug but not compressing the skin. Take 2–3 readings and average them.