❤️ Health
Body Fat Percentage Calculator
Uses the US Navy circumference method — the most accessible accurate estimate without calipers or DEXA.
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Estimated Body Fat
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Fat Mass
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Lean Mass
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BMI
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Body Fat Categories (Men)
| Category | Body Fat % |
|---|---|
| Essential Fat | 2–5% |
| Athletic | 6–13% |
| Fitness / Fit | 14–17% |
| Average | 18–24% |
| Obese | 25%+ |
⚕️ This is an estimate for informational purposes only. Consult a healthcare provider for clinical assessment.
How the Navy method works
Men: BF% = 86.01 × log₁₀(waist − neck) − 70.041 × log₁₀(height) + 36.76
Women: BF% = 163.205 × log₁₀(waist + hip − neck) − 97.684 × log₁₀(height) − 78.387
Women: BF% = 163.205 × log₁₀(waist + hip − neck) − 97.684 × log₁₀(height) − 78.387
Developed by the US Navy, this formula uses body circumferences — waist, neck, and (for women) hip — to estimate body fat without equipment. It correlates well with hydrostatic weighing for most body types.
Measure in the morning before eating. Keep the tape snug but not tight. Take the average of two measurements at each site.