All Tools
Estimate your body fat percentage using the US Navy method. Just enter your neck, waist, and hip measurements — no equipment needed.
Estimate your body fat percentage instantly using the US Navy method — no calipers or special equipment needed. Just enter your neck, waist, and hip (women) circumference measurements along with your height. The US Navy method is one of the most accurate tape-measure-based formulas, used by the military for fitness assessments. See your body fat category and lean mass estimate. Everything runs in your browser.
The US Navy method is accurate to within 3-4% of DEXA scan results for most people. It's the most reliable tape-measure-based method and is used for official military fitness assessments. For maximum accuracy, measure in the morning before eating.
For men: 6-13% is athletic, 14-17% is fit, 18-24% is average, 25%+ is overweight. For women: 14-20% is athletic, 21-24% is fit, 25-31% is average, 32%+ is overweight. Women naturally carry more essential fat.
Neck: measure at the narrowest point, below the Adam's apple. Waist: men measure at the navel, women at the narrowest point. Hips (women only): measure at the widest point of the buttocks.
Every 2-4 weeks is sufficient. Body fat changes slowly — daily fluctuations are mostly water weight. Measure at the same time of day (morning is best) for consistent comparisons.