Body Fat Calculator
Calculate your body fat percentage using the U.S. Navy method. Understand your body composition.
How to Calculate
Male: 86.010 × log₁₀(waist - neck) - 70.041 × log₁₀(height) + 36.76
The U.S. Navy method estimates body fat percentage using circumference measurements. For males, it uses waist and neck circumference with height. For females, it uses waist, hip, and neck circumference with height. The formula applies logarithms to model the relationship between body dimensions and body density.
Frequently Asked Questions
How does the Navy body fat method work?
The U.S. Navy method uses circumference measurements (neck, waist, and hip for women) along with height to estimate body fat percentage. It is a practical field method that requires only a measuring tape.
What is a healthy body fat percentage?
For men: 10-20% is healthy (6-13% for athletes). For women: 18-28% is healthy (14-20% for athletes). Essential fat minimums are 2-5% for men and 10-13% for women.
Body fat vs BMI - which is better?
Body fat percentage is more accurate than BMI because it distinguishes between muscle and fat. BMI can misclassify muscular individuals as overweight. However, BMI is simpler and useful for population-level screening.