Is the Navy body-fat calculator accurate?
It is useful for a quick estimate, but DEXA, calibrated skinfolds, and repeated measurements are better for precision.
Free calculator
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy tape method, then translate it into fat mass and lean mass.
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How the Navy tape method works
The Navy method estimates body fat from circumference measurements. Men use waist, neck, and height. Women also use hip circumference.
It is convenient for home tracking, but tape placement and posture can change the result. Measure the same way each time.
Men: 86.010 x log10(waist - neck) - 70.041 x log10(height) + 36.76 Women: 163.205 x log10(waist + hip - neck) - 97.684 x log10(height) - 78.387
Frequently asked questions
Where should I measure my waist?
Use a relaxed tape around the abdomen at the navel level, then keep that same placement for future measurements.