Body Fat Estimator
Estimate body fat percentage using the U.S. Navy circumference method. Includes lean mass, fat mass, and category classification.
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Body Fat Category Reference
| Category | Men | Women |
|---|---|---|
| Essential Fat | 2–5% | 10–13% |
| Athlete | 6–13% | 14–20% |
| Fitness | 14–17% | 21–24% |
| Average | 18–24% | 25–31% |
| Obese | ≥ 25% | ≥ 32% |
About the Navy Method
The U.S. Navy circumference method estimates body fat using simple body measurements. For men: BF% = 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76. For women, hip circumference is added to the formula.
This method has an accuracy of approximately ±3–4% compared to DEXA scans. It is most accurate for individuals with average body proportions. It may underestimate body fat in very muscular individuals and overestimate in those with unusual fat distribution patterns.
For clinical precision, consider DEXA (dual-energy X-ray absorptiometry), hydrostatic weighing, or a Bod Pod assessment.