# Body Fat Calculator Estimate your body-fat percentage with the U.S. Navy circumference method — just a tape measure. Runs entirely in your browser. 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. --- *Source: [ocxly.com/body-fat-calculator.html](https://ocxly.com/body-fat-calculator.html) — OCXLY, free 100% client-side privacy-first tools. Free body fat percentage calculator using the U.S. Navy circumference method. Estimate body fat from tape measurements and height, entirely in your browser.*