Body Fat Percentage Calculator

Estimate body fat percentage via the US Navy method (height, waist, neck — plus hip for women) with ACE category bands.

About you

Sex

Male Female

The Navy method uses different waist landmarks for men and women.

Measurements

Units

in / lb cm / kg

Height (ft)

Height (in)

Waist (in)

How to measure waist

Measure at the level of the navel; tape parallel to the floor; relaxed exhale, don't suck in.

Neck (in)

Weight (lb, optional — for fat / lean mass)

Export

How this is calculated

US Navy method (Hodgdon-Beckett 1984):

Men: BF% = 86.010·log₁₀(waist − neck) − 70.041·log₁₀(height) + 36.76 (inches).
Women: BF% = 163.205·log₁₀(waist + hip − neck) − 97.684·log₁₀(height) − 78.387 (inches).

Fat mass = weight × BF% / 100; lean mass = weight − fat mass. Bands are ACE-published norms (Essential / Athletes / Fitness / Average / Obese).