Army Body Fat Calculator
Body fat (%) via the US Army circumference method.
How it works
Male: 86.010×log₁₀(waist−neck) − 70.041×log₁₀(height) + 36.76; Female: 163.205×log₁₀(waist+hip−neck) − 97.684×log₁₀(height) − 78.387
The US Army formula, slightly different from the Navy method. Men use waist and neck; women add hip.
Worked example
Male, 25, 175 cm, waist 85 cm, neck 38 cm (US Army, inches):
Waist − neck = 18.5 in, BF% = 86.010×log₁₀18.5 − 70.041×log₁₀68.9 + 36.76 ≈ 17%.
Notes and limitations
The Army and Navy equations usually agree closely, but both are highly sensitive to tape placement — 1 cm can shift the result by about a point. Keep the method consistent.