Estimate body fat percentage using the U.S. Navy circumference method.
Estimate body fat percentage using the U.S. Navy circumference method.
Enter values above and click Calculate — results will appear here with the formula explained.
The U.S. Navy tape method estimates fat percentage from where bodies store it: waist relative to neck for men, adding hips for women, scaled by height. It costs nothing and repeats easily, making it practical for tracking direction even if absolute precision is limited.
Accuracy depends on technique — same anatomical landmarks each time, relaxed muscles, snug-but-not-compressing tape. Expect several points of spread versus DEXA scans; trend changes matter more than the raw number itself.
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Body Fat Calculator: Estimate body fat percentage using the U.S. Navy circumference method. Formula: Navy method uses log₁₀ of circumference ratios: men: 86. Example: A male at 180 cm with 38 cm neck and 85 cm waist: 86.
The U.S. Navy tape method estimates fat percentage from where bodies store it: waist relative to neck for men, adding hips for women, scaled by height. It costs nothing and repeats easily, making it practical for tracking direction even if absolute precision is limited.
Accuracy depends on technique — same anatomical landmarks each time, relaxed muscles, snug-but-not-compressing tape. Expect several points of spread versus DEXA scans; trend changes matter more than the raw number itself.
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A male at 180 cm with 38 cm neck and 85 cm waist: 86.01·log₁₀(47) − 70.041·log₁₀(180) + 36.76 ≈ 17.5% estimated body fat.
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