Calculators & Converters
Body Fat Percentage Calculator
The Body Fat Percentage Calculator uses the U.S. Navy circumference method to estimate body fat percentage from a few simple tape-measure readings -- no special equipment needed.
The formula differs slightly by gender: the male formula uses waist and neck, while the female formula also factors in hip measurement.
How to Use the Body Fat Percentage Calculator
- Open the Body Fat Percentage Calculator.
- Select your gender.
- Enter your height, neck and waist measurements in centimeters.
- If female, also enter your hip measurement.
- Read your estimated body fat percentage.
Frequently Asked Questions
How accurate is the Navy method?
It's a reasonably reliable estimate for most body types when measurements are taken carefully, though it can be less accurate for very lean or very muscular individuals compared to methods like DEXA scans.
Where exactly should I measure my waist and neck?
Measure your neck just below the larynx, and your waist at the narrowest point (or at the navel for the standard Navy protocol). Consistent measurement technique matters for accuracy.
Why does the formula need my hip measurement only if I'm female?
The U.S. Navy method uses different regression formulas for men and women based on where body fat is typically distributed, and the female formula specifically includes hip circumference.