Body Fat Calculator

How this body fat calculator works

This calculator uses the US Navy circumference method, one of the most practical ways to estimate body fat percentage at home. It requires only a measuring tape and uses circumference measurements at the neck, waist (and hip for women) along with height.

The formula

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

Body fat categories

For best results, measure in the morning before eating, and take each measurement 2-3 times using the average. Keep the tape horizontal and snug but not compressing.