Body Fat Percentage Calculator

What This Calculator Does

This calculator uses the U.S. Navy body fat estimation method, which calculates body fat percentage from simple body circumference measurements. While not as accurate as methods like DEXA scans or hydrostatic weighing, the Navy method provides a reasonable estimate that you can track over time to monitor progress.

The Formula

Example Calculations

Example: Male measurement

A man with a 34-inch waist, 15-inch neck, and 70-inch height. BF% = 86.010 x log10(34-15) - 70.041 x log10(70) + 36.76 = 86.010 x 1.279 - 70.041 x 1.845 + 36.76 = 17.5% body fat (Fitness category).

Example: Female measurement

A woman with a 30-inch waist, 13-inch neck, 38-inch hips, and 65-inch height. BF% = 163.205 x log10(30+38-13) - 97.684 x log10(65) - 78.387 = 163.205 x 1.740 - 97.684 x 1.813 - 78.387 = 25.5% body fat (Fitness category).

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How to Use Your Results

Track your body fat percentage monthly to monitor progress. Body fat is a better indicator of fitness than weight alone since muscle weighs more than fat. For men, 10 to 20 percent is considered healthy and fit. For women, 18 to 28 percent is the healthy fitness range. Take measurements at the same time of day for consistency, preferably in the morning before eating.