Free tool

Body fat % calculator

Uses the U.S. Navy circumference method — neck, waist, hips. Estimates within ~3% for most people. Cheaper and more accessible than DEXA, less variable than calipers.

Measure first thing in the morning, no shirt. Waist at the navel, neck just below the larynx, hips at the widest point.

Estimated body fat

23.5%

Average

This is an estimate within ~3%. For accuracy, use DEXA — for trend tracking, this method works just fine. Measure under the same conditions every 4–6 weeks.

Next step

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