Body Fat Calculator
The Body Fat Calculator uses the U.S. Navy circumference method to estimate your body fat percentage from simple tape-measure measurements, no special equipment required.
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How This Tool Works
Enter your sex, height, neck, waist, and (for women) hip measurements to calculate your estimated body fat percentage using the U.S. Navy method.
Formula & Method
Men: 495 ÷ (1.0324 − 0.19077×log10(waist−neck) + 0.15456×log10(height)) − 450. Women: 495 ÷ (1.29579 − 0.35004×log10(waist+hip−neck) + 0.22100×log10(height)) − 450 (all measurements in cm).
Example Calculation
A man 70 inches tall with a 15 in neck and 34 in waist has an estimated body fat of about 15.8% — in the "fit" category.
Frequently Asked Questions
How accurate is the Navy method?+
It's typically accurate within about 3–4% of more precise methods like DEXA scanning, making it a solid at-home estimate.
Where do I measure my waist?+
Measure around your waist at the level of your navel, keeping the tape snug but not compressing the skin.
Why do women need a hip measurement but men don't?+
The Navy method formula for women includes hip circumference because body fat distribution patterns differ by sex, improving the estimate's accuracy.
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