Body Fat Calculator
Calculate your body fat percentage using the US Navy circumference method. Enter your measurements for instant results — see your category, lean mass, and fat mass.
Your body composition
Navy method estimates are within ±3-4% accuracy. For clinical precision, use a DEXA scan or hydrostatic weighing.
Understanding body fat percentage
Your body fat percentage is the proportion of your total weight that comes from fat, as opposed to muscle, bone, water, and organs. It's a more meaningful health metric than BMI, which doesn't distinguish between fat and muscle mass.
The US Navy body fat method
This calculator uses the US Navy circumference method, which estimates body fat from measurements of the neck, waist (and hip for women) combined with height. The formulas are: Men: 495 ÷ (1.0324 − 0.19077 × log₁₀(waist − neck) + 0.15456 × log₁₀(height)) − 450. Women: 495 ÷ (1.29579 − 0.35004 × log₁₀(waist + hip − neck) + 0.22100 × log₁₀(height)) − 450.
Healthy body fat ranges (ACE)
Men: Essential 2-5%, Athletes 6-13%, Fitness 14-17%, Average 18-24%, Obese 25%+. Women: Essential 10-13%, Athletes 14-20%, Fitness 21-24%, Average 25-31%, Obese 32%+.
Related: BMR Calculator · BMI Calculator · Macro Calculator