Estimate body fat percentage using the U.S. Navy method. Enter neck, waist, and height (plus hip for women). Choose US or metric units.
| ACE 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% |
This method estimates body fat from circumferences and height. Results may differ from DEXA, hydrostatic weighing, or calipers. Use consistent measuring technique for best comparisons.
Estimate your body fat percentage with our free body fat calculator using the U.S. Navy method, one of the most accessible and widely used body composition estimation techniques. Simply enter a few body measurements to get your result.
This calculator uses the U.S. Navy circumference method, which estimates body fat using measurements of the neck, waist, and (for women) hip circumference, combined with height.
The formula differs slightly for men and women due to different fat distribution patterns, using logarithmic calculations based on these circumference measurements.
The Navy method is reasonably accurate for most people (typically within 3-4% of more precise methods like DEXA scans).
For men, 10-20% is generally considered healthy/athletic range. For women, 18-28% is typical.
Men and women naturally store fat differently, so the calculation formulas account for these physiological differences.
Measure your neck just below the larynx, and your waist at the narrowest point, keeping the tape measure snug but not compressing the skin.