The Body Fat Calculator uses the validated U.S. Navy circumference method (measuring neck, waist, and hips) to estimate total body fat percentage and fat mass vs. lean mass.
Estimate your body fat percentage and lean muscle mass using the U.S. Navy circumference method.
Evidence-based estimations. Consult a physician for personalized guidance.
Official clinical definitions and validated mathematical models
The U.S. Navy circumference method correlates body dimensions with underwater weighing and DXA scans with a standard error of approximately 3–4%.
| Category | Women (% Fat) | Men (% Fat) |
|---|---|---|
| Essential Fat | 10 – 13% | 2 – 5% |
| Athletes | 14 – 20% | 6 – 13% |
| Fitness | 21 – 24% | 14 – 17% |
| Average | 25 – 31% | 18 – 24% |
| Obese | ≥ 32% | ≥ 25% |
| Age Bracket | Women Ideal % | Men Ideal % |
|---|---|---|
| Age 20 | 17.7% | 8.5% |
| Age 25 | 18.4% | 10.5% |
| Age 30 | 19.3% | 12.7% |
| Age 35 | 21.5% | 13.7% |
| Age 40 | 22.2% | 15.3% |
| Age 45 | 22.9% | 16.4% |
| Age 50 | 25.2% | 18.9% |
| Age 55+ | 26.3% | 20.9% |
Calculate your Body Mass Index (BMI) and determine your healthy weight category.
Compute your ideal body weight based on Devine, Robinson, Miller, and Hamwi equations.
Find the optimal weight range for your height based on medical standards.
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