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Body Fat Calculator: US Navy Circumference Method
Estimate your body fat percentage and lean mass ratio using body circumference measurements and height with the validated US Navy fitness equation.
The US Navy method explained
The formula uses waist and neck circumference for men, and waist, neck, and hip circumference for women, compared against stature.
Measuring technique
Use a non-elastic tape measure pulled snug against the skin without compressing soft tissue. Measure at the navel for men and narrowest waist point for women.
Body fat categories
Essential fat ranges from 2–5% for men and 10–13% for women; fitness ranges are typically 14–17% for men and 21–24% for women.