Free tool

Body Fat Calculator

Estimate your body-fat percentage (US Navy method).

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Sex

Height (cm)

Neck (cm)

Waist (cm)

Estimated body fat

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Uses the U.S. Navy circumference method — an estimate, not a substitute for a DEXA scan or clinical assessment.

About this method

The U.S. Navy method estimates body-fat percentage from a few tape-measure circumferences and your height. It's quick, free and reasonably consistent for tracking changes over time.

Measure at the widest point for waist/hip and just below the larynx for neck, keeping the tape snug but not tight.