Body Fat Percentage Calculator
Estimate your body-fat percentage using the U.S. Navy circumference method — just a tape measure required.
How to use the body fat calculator
- Select your sex and unit system.
- Enter your height, neck, and waist (and hip for women).
- Click Calculate to estimate body-fat percentage and category.
Why circumferences predict body fat
Fat tends to accumulate at the waist and hips, while the neck stays relatively lean. The ratios between these measurements, combined with height, correlate well with overall body composition, which is the basis of the Navy formula.
Frequently asked questions
How accurate is the Navy body fat method?
The Navy circumference method is typically within 3–4% of more precise methods like DEXA, making it a practical at-home estimate.
What is a healthy body fat percentage?
Roughly 10–20% for men and 18–28% for women is considered healthy and athletic, with essential fat floors of about 3% and 12% respectively.
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