Body Fat Percentage Calculator (US Navy)

Estimate body fat percentage from neck, waist, and hip measurements using the US Navy circumference method.

Inputs

Result

Formula used

Measurements are converted to inches, then:
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
Fat mass = Weight × BF% ÷ 100; Lean mass = Weight − Fat mass
FFMI = Lean mass (kg) ÷ Height (m)²