💪Body Fat Calculator (US Navy Method)
The US Navy body fat method estimates body fat percentage from circumference measurements (neck, waist, hip for women) and height, without requiring expensive body composition equipment. It was developed for military fitness standards.
- 1Male: %BF = 86.010×log10(waist−neck) − 70.041×log10(height) + 36.76
- 2Female: %BF = 163.205×log10(waist+hip−neck) − 97.684×log10(height) − 78.387
- 3All measurements in inches for the original formula
- 4Accuracy ±3–4% compared to DEXA (gold standard)
Male: neck 38cm · waist 85cm · height 175cm=Body fat ≈ 17%Healthy range for adult males: 10–22%
| Category | Male | Female |
|---|---|---|
| Essential fat | 2–5% | 10–13% |
| Athletic | 6–13% | 14–20% |
| Fitness | 14–17% | 21–24% |
| Average | 18–25% | 25–31% |
| Obese | > 25% | > 32% |
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Fun Fact
The US military uses this method to set maximum body fat standards: males under 40 must be ≤ 20% (Army), ≤ 22% (Navy), ≤ 18% (Marines). Failure can result in discharge.
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