Body Fat Calculator
Estimate your body fat percentage using the US Navy tape method, from a few simple body measurements.
Men: at navel level. Women: at the narrowest point.
Enter your height and measurements. For men, the waist must be larger than the neck; for women, waist plus hip must exceed the neck.
The US Navy method estimates body fat from your height and a few tape measurements. Measure around the narrowest part of your neck and, for the waist, at navel level (men) or the narrowest point (women). It's an estimate, not a clinical measurement.
Frequently asked questions
It's a reasonable estimate for most people and only needs a tape measure, but it's less precise than methods like DEXA scans or hydrostatic weighing — expect it to be within a few percentage points. Consistent measuring technique matters most for tracking change over time.
The Navy formula for women includes the hip circumference alongside the neck and waist, because it improves the estimate for typical female body-fat distribution. The men's formula uses only neck and waist.