Percentage calculator
Calculate percentages online, including percent of a number, percentage increase, and percentage decrease.
Body fat calculator
Estimate body fat percentage with the U.S. Navy tape-measure method. See fat mass, lean mass, BMI, and your fitness category.
Just below the larynx
Men: at the navel · Women: narrowest point
Widest point
Lengths in centimeters, weight in kilograms.
How to use Body fat calculator
Estimate your body fat percentage with a tape measure using the U.S. Navy circumference method.
- Men: measure neck and waist (at the navel)
- Women: measure neck, waist (at the narrowest point), and hips (at the widest point)
The result includes fat and lean mass, your category on the American Council on Exercise chart, and a BMI-based estimate for comparison. Switching between metric and imperial converts your entries automatically.
Body fat calculator FAQs
Is Body fat calculator free?
Body fat calculator is a free online tool on ReallyUseful.Tools. No account is required.
Does Body fat calculator run in my browser?
Body fat calculator is designed to run in your browser where supported, so files can stay on your device instead of being uploaded to a server.
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