Body Fat Calculator
Estimate body fat percentage using the U.S. Navy method. Requires neck, waist, and (for women) hip measurements.
Enter measurements to estimate body fat.
U.S. Navy Body Fat Formula
Male: BF% = 86.010 × log₁₀(waist − neck) − 70.041 × log₁₀(height) + 36.76
Female: BF% = 163.205 × log₁₀(waist + hip − neck) − 97.684 × log₁₀(height) − 78.387
Female: BF% = 163.205 × log₁₀(waist + hip − neck) − 97.684 × log₁₀(height) − 78.387
Note: Measurements in cm are converted internally.
Body Fat Categories
| Category | Men | Women |
|---|---|---|
| Essential fat | 2–5% | 10–13% |
| Athletic | 6–13% | 14–20% |
| Fitness | 14–17% | 21–24% |
| Average | 18–24% | 25–31% |
| Obese | 25%+ | 32%+ |
Disclaimer: This is an estimate. Accurate body fat measurement requires methods like DEXA or hydrostatic weighing. Consult a healthcare professional.
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Last updated: 2026-08-08