Body Fat Percentage Calculator
Estimate body fat percentage with the U.S. Navy tape method.
Uses the U.S. Navy circumference method, which estimates body fat from tape measurements. It's a quick estimate, not as precise as a DEXA scan, and not medical advice. Runs in your browser.
Results are general estimates for information only, not medical advice — consult a qualified professional for health decisions. See how we build our calculators.
Estimate your body fat percentage with the U.S. Navy circumference method, which uses tape measurements of your neck, waist (and hips for women) plus your height. It's a quick, no-equipment estimate and shows a fitness category. Less precise than a DEXA scan, and not medical advice. Runs in your browser.
How to use the Body Fat Calculator
- Pick metric or imperial and select your sex.
- Measure and enter your height, neck and waist (and hips for women).
- Read your estimated body fat percentage and category.
Frequently asked questions
How accurate is the Navy method?
It's typically within a few percentage points for most people — good enough to track changes over time, but not as precise as a DEXA or hydrostatic test. Measure consistently for the best comparisons.
Where do I measure?
Neck just below the larynx, waist at the navel for men and the narrowest point for women, and hips at the widest point. Keep the tape snug and level.