Body Fat Calculator
Estimate your body fat percentage using the US Navy method based on simple body measurements. No special equipment needed.
Results
Body Fat Categories (Men)
How Body Fat Is Estimated
This calculator uses the US Navy Body Fat Formula, which estimates body fat percentage from simple circumference measurements:
Men: 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76
Women: 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387
This method is reasonably accurate (within 3-4% of DEXA scan results) and requires no special equipment. For more precision, consider DEXA scans, hydrostatic weighing, or calipers with a trained professional.
Frequently Asked Questions
The US Navy method is accurate within 3-4% of more advanced methods like DEXA scans. It is more reliable than BMI for assessing body composition, especially for muscular individuals.
Waist: at the navel level, relaxed (do not suck in). Neck: at the narrowest point below the Adam's apple. Hip (women): at the widest point of the buttocks. Measure with a flexible tape, snug but not compressing.
For men: 14-24% is average, 6-13% is athletic. For women: 25-31% is average, 14-20% is athletic. Essential fat minimums are 2-5% (men) and 10-13% (women).
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