Estimate body fat %. Fast, accurate, and completely free.
All measurements must be entered in inches. Logs are base 10.
Select your units (Metric or Imperial).
Select your biological gender (crucial as fat distribution algorithms differ significantly).
Measure circumferences using a flexible tape measure: Neck (just below larynx), Waist (at navel for men, narrowest point for women), and Hip (widest point, for females only).
Enter the values and view your body fat percentage and fitness category.
Body fat percentage represents the total mass of fat divided by total body mass, multiplied by 100. It distinguishes between essential fat (necessary for insulation, hormone regulation, and organ protection) and storage fat (excess energy reserves).
This calculator uses the U.S. Navy Circumference Method, which provides a highly reliable, cost-effective estimation of body fat using simple tape measurements of the neck, waist, and hips.
For adult men, 8% to 19% is considered healthy and fit, while anything above 25% indicates obesity.
For adult women, 21% to 33% is considered healthy, while anything above 32% indicates overweight or obesity.
Women naturally accumulate more subcutaneous fat around the hips and thighs (gynecoid pattern), which must be factored into body fat distribution models.
When measured correctly, the Navy method is accurate within 3% to 4% of dual-energy X-ray absorptiometry (DEXA) scans.
Essential fat is the minimum fat required for basic physiological functioning (about 3% for men, 12% for women).
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