Estimate your body fat percentage using the U.S. Navy circumference method — just a tape measure and a few measurements.
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BMI can't tell muscle from fat. Body fat percentage gives a clearer picture of body composition — and the U.S. Navy method estimates it with just a tape measure, no calipers or scans needed.
The method uses circumference measurements — neck, waist, and (for women) hip — plugged into a validated formula developed for the U.S. Navy's body composition standards, still widely used today.
Ranges shift slightly by sex — men's essential fat sits lower than women's, reflecting real physiological differences. Athletic and fitness ranges reflect visible muscle definition; average range is typical, healthy body composition.
Compare this against your BMI Calculator and Ideal Weight Calculator results in Fitness, and use our Calorie & TDEE Calculator in Nutrition to plan toward your goal.
It's one of the more accurate tape-measure-based methods, typically within a few percentage points of DEXA scan results for most body types.
Men and women naturally carry and distribute body fat differently, so the formula (and hip measurement requirement) reflects that physiological difference.
For assessing body composition specifically, yes — BMI can't distinguish muscle from fat, while this method directly estimates fat percentage.