US Navy circumference method for body fat estimation.
Men: %BF = 86.010 × log₁₀(waist−neck) − 70.041 × log₁₀(height) + 36.76. Women: %BF = 163.205 × log₁₀(waist+hip−neck) − 97.684 × log₁₀(height) − 78.387. Measurements in inches. This method is used by the US military for fitness standards. Accuracy is ±3–4% compared to DEXA.