Calculate body fat percentage using the US Navy circumference method.
A body fat percentage calculator estimates the proportion of your total body weight that is fat versus lean mass (muscle, bone, organs, water). Body fat is a far more meaningful health metric than weight or BMI alone — two people of the same height and weight can have dramatically different fat percentages and health profiles.
The US Navy circumference method used in this calculator is accurate to within 3–4% for most adults, requires only a tape measure, and is the standard military body composition test in the US, Canada, and several other countries. More accurate methods (DEXA scan, hydrostatic weighing) require lab equipment.
\%BF_{men} = 86.010 \log_{10}(W - N) - 70.041 \log_{10}(H) + 36.76
Inputs: Male · Height 180 cm · Waist 88 cm · Neck 38 cm
For men: 10–20% is healthy, 6–10% is athletic, below 5% is below essential fat and unsafe long-term. For women: 18–28% is healthy, 14–20% is athletic, below 12% disrupts hormones. "Six-pack abs" usually require under 12% body fat for men and under 18% for women — neither is sustainable for everyone.
Bioelectrical impedance scales (most home scales) measure resistance to a tiny electrical current, which depends heavily on hydration. The same person can read 18% in the morning and 22% in the evening on the same scale. Use the same scale at the same time of day under similar hydration for consistency; track trends, not single readings.
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