Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method. Enter your measurements to get body fat %, lean mass, fat mass, and a visual category breakdown.
U.S. Navy Method: Uses circumference measurements to estimate body fat. Results are estimates — DEXA scan or hydrostatic weighing are more accurate.
What Is Body Fat?
Body fat percentage indicates the proportion of fat in your body relative to total weight. It's a better health indicator than BMI as it accounts for body composition.
Formula
Men: %BF = 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76
Women: %BF = 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387Example
A 5'10" male with a 34" waist and 15" neck has approximately 17.7% body fat, classified as 'Fit'.
Frequently Asked Questions
What's a healthy body fat percentage?
For men: 10-20% is healthy, 6-13% is athletic. For women: 18-28% is healthy, 14-20% is athletic.
How accurate is this method?
The Navy method is within 1-3% of more expensive methods like DEXA scanning for most people.