This calculator estimates body fat percentage for adults who have a tape measure but no access to laboratory body-composition testing.
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Measure height, neck, and waist, plus hips for women, using the same unit throughout. Keep the tape level and snug without compressing the skin, and repeat each measurement for a more dependable average.
Using the U.S. Navy method with measurements in inches, male body fat percentage = 86.010 x log10(waist - neck) - 70.041 x log10(height) + 36.76. Female body fat percentage = 163.205 x log10(waist + hip - neck) - 97.684 x log10(height) - 78.387.
A man with a 36-inch waist, 15-inch neck, and 70-inch height has an estimated body fat percentage of about 20.3 percent. Small measurement changes can shift the result, so consistent tape placement matters.
It is useful for estimating trends, but it can differ from a clinical measurement by several percentage points. Use the same method and conditions each time rather than treating one result as exact.
Follow the calculator's stated measurement site, since formulas are tied to specific locations. Measure after a normal exhale, without pulling in your stomach or tightening the tape.
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