Body Fat Calculator
Estimate body fat percentage from the U.S. Navy circumference method (neck, waist, hips, height). An estimate with a typical error of ±3–4 percentage points — useful for tracking change, not as a precise measurement.
Estimated body fat
14.9%
Fitness range for men (American Council on Exercise categories).
| Body fat | 14.9% |
| Typical error | ±3–4 percentage points |
Body-fat categories (American Council on Exercise)
| Category | Men | Women |
|---|---|---|
| Essential fat | 2–5% | 10–13% |
| Athletes | 6–13% | 14–20% |
| Fitness | 14–17% | 21–24% |
| Average | 18–24% | 25–31% |
| Obese | 25%+ | 32%+ |
The Navy method is useful for tracking change over time, not as a precise measurement. Measure the same way, at the same time of day, and watch the trend rather than a single reading.
Formula & source — U.S. Navy circumference method (Hodgdon & Beckett, 1984)
Men: %BF = 495 ÷ (1.0324 − 0.19077 × log₁₀(waist − neck) + 0.15456 × log₁₀(height)) − 450. Women: %BF = 495 ÷ (1.29579 − 0.35004 × log₁₀(waist + hip − neck) + 0.22100 × log₁₀(height)) − 450. All measurements in centimetres. Categories: American Council on Exercise.
Estimate, not medical advice. FitCalc results are estimates based on population-average formulas. They are not a diagnosis, a prescription, or a substitute for professional medical advice. If you have a medical condition, are pregnant, or take medication, talk to a doctor or registered dietitian before changing your diet or exercise. FitCalc claims no medical credentials.
Try next: TDEE Calculator · BMR Calculator · Calorie Calculator