Wellness & Accessibility · Free Tool
Body Fat Calculator
Estimate your body-fat percentage with the U.S. Navy circumference method — just a tape measure. Runs entirely in your browser.
Body fat
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Category
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A circumference estimate — not a substitute for DEXA or clinical assessment. Not medical advice.
How it works
The U.S. Navy method estimates body fat from a few tape measurements and your height. For men it uses waist and neck; for women it adds the hip. The formula works in inches, so metric measurements are converted first, then: %BF = 86.01×log₁₀(waist−neck) − 70.041×log₁₀(height) + 36.76 (men). It’s a solid estimate for tracking trends, computed entirely on your device.