๐ช Body Fat Percentage Calculator
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Enter your height and circumference measurements (neck, waist, and hip for women) to estimate body fat percentage with the US Navy method. The result includes a fitness-category label and the typical recommended range for your sex.
Estimate only โ not medical advice. Skinfold calipers, DEXA scans, or hydrostatic weighing are more accurate. Use this as a quick check, not a diagnosis.
How to use
- Pick your biological sex.
- Measure neck circumference at the narrowest point, just below the larynx.
- Measure waist circumference at the navel for men, at the narrowest point for women. Relax โ don't suck in.
- For women, also measure hip circumference at the widest point.
- Enter your height in centimeters. Click Calculate.
Formula (US Navy): Male BFP = 86.010ยทlog10(waist โ neck) โ 70.041ยทlog10(height) + 36.76. Female BFP = 163.205ยทlog10(waist + hip โ neck) โ 97.684ยทlog10(height) โ 78.387.
The Navy method has ยฑ3% accuracy versus hydrostatic weighing for typical body shapes โ better than BMI for body composition but worse than DEXA. Take measurements first thing in the morning for consistency.