Body Fat Calculator
Estimate your body fat percentage using the US Navy method. Requires height, weight, waist, and neck measurements. See also BMI Calculator and Ideal Weight Calculator.
How to Calculate Body Fat Percentage
The US Navy body fat formula estimates body fat percentage using circumference measurements. For men, it uses waist and neck measurements. For women, it adds hip measurement. The formula uses logarithmic calculations based on the relationship between body circumferences and body density. While not as accurate as DEXA scans or hydrostatic weighing, it provides a reasonable estimate using only a tape measure.
US Navy Body Fat Formula
For Men:
For Women:
Body Fat Categories
| Category | Men | Women |
|---|---|---|
| Essential Fat | 2-5% | 10-13% |
| Athletes | 6-13% | 14-20% |
| Fitness | 14-17% | 21-24% |
| Average | 18-24% | 25-31% |
| Obese | 25%+ | 32%+ |
Frequently Asked Questions
How accurate is the US Navy body fat method?
The US Navy method is accurate to within 1-3% for most people when measurements are taken correctly. It is less accurate for very lean or very obese individuals. For clinical accuracy, DEXA scans or hydrostatic weighing are preferred.
Where should I measure my waist?
Measure at the narrowest point of your waist, typically at the navel level. For the Navy method specifically, measure at the navel for men. Stand relaxed and don't suck in your stomach.
What is a healthy body fat percentage?
For men, 14-17% is considered fit, and 18-24% is average. For women, 21-24% is fit, and 25-31% is average. Essential fat (minimum for health) is 2-5% for men and 10-13% for women.