Body Fat Calculator
Estimate your body fat percentage with the U.S. Navy circumference method. Metric and imperial.
| Category | Men | Women |
|---|---|---|
| Essential Fat | 2–5% | 10–13% |
| Athletes | 6–13% | 14–20% |
| Fitness | 14–17% | 21–24% |
| Acceptable | 18–24% | 25–31% |
| Obese | 25%+ | 32%+ |
Measurement tips: Neck — measure just below the larynx (Adam's apple). Waist — measure at the navel. Hip (women only) — measure at the widest point, feet together. Measure snugly but without compressing the skin.
Disclaimer: the U.S. Navy circumference method is an estimate, accurate to roughly ±3-4% of body fat versus underwater weighing for most people — not a diagnostic measurement. Consult a qualified healthcare professional for a full body composition assessment.
About Body Fat Calculator
The Body Fat Calculator estimates your body fat percentage using the U.S. Navy circumference method — accurate to within roughly 3-4% of body fat compared to underwater weighing for most people. Enter your waist, neck, and height measurements (plus hip for women), and get an instant estimate with its ACE category. Everything is calculated locally in your browser. This is an estimate for general reference, not a medical measurement.