BF%

Body Fat Calculator

Your body fat percentage from a tape measure, by the US Navy method.

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Result…

Units
Sex
years
kg
cm
cm

Just below the larynx, tape sloping slightly down to the front.

cm

Men: at the navel. Women: at the narrowest point.

 

…

How it's calculated

US Navy (Hodgdon & Beckett), lengths in cm:
Men: %BF = 495 ÷ (1.0324 − 0.19077 × log₁₀(waist − neck) + 0.15456 × log₁₀(height)) − 450
Women: %BF = 495 ÷ (1.29579 − 0.35004 × log₁₀(waist + hip − neck) + 0.22100 × log₁₀(height)) − 450

The US Navy method estimates body density from a few tape measurements and turns it into a fat percentage with the Siri equation. Measure on bare skin, tape snug but not pressing, and take each measurement twice. The categories are the American Council on Exercise ranges; the BMI-based Deurenberg estimate is shown for comparison and is much rougher.

Your numbers, step by step

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