Body Fat Calculator
Estimate your body fat percentage from circumference measurements using the U.S. Navy method.
About this calculator
The U.S. Navy circumference method estimates body fat from neck, waist (and hip for women) measurements and height. It’s accurate to within roughly ±3% for most people and needs only a tape measure. Measure the waist at the navel, the neck below the larynx.
Formula
Men: 495 / (1.0324 − 0.19077·log₁₀(waist−neck) + 0.15456·log₁₀(height)) − 450 Women: 495 / (1.29579 − 0.35004·log₁₀(waist+hip−neck) + 0.221·log₁₀(height)) − 450
Results are estimates for information only — not medical advice. Sources: WHO, CDC, and peer-reviewed research.
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