Body Fat Percentage Calculator

Body fat percentage is a more accurate health indicator than weight alone. The U.S. Navy method uses simple circumference measurements to estimate your body fat percentage. Essential fat (6-13% men, 14-20% women) is needed for basic bodily functions. Athletes (6-13% men, 14-20% women) have lean physiques from regular training. Fitness category (14-17% men, 21-24% women) reflects regular exercise and good health. Average (18-24% men, 25-31% women) is typical for the general population. Above average may carry increased health risk, though body fat alone isn't a full health measure. Muscle mass matters too — a bodybuilder at 12% and a sedentary person at 20% may weigh the same.

How to Use This Tool

Select your gender.
Measure your waist at navel level.
Measure your neck just below the larynx.
Measure your height.
Women: measure hip at widest point.
Click Calculate.

The Formula

U.S. Navy formula uses log-based ratios of circumferences. Men: waist/neck/height. Women: waist+hip/neck/height.

Why It Matters

You are a 32-year-old male with a 36-inch waist, 15-inch neck, and 70-inch height. The U.S. Navy method estimates your body fat at 14.2% — in the fitness category. Athletes typically range 6-13%.