Body Fat Percentage Calculator

Estimate your body fat percentage using the US Navy circumference method — no equipment needed.

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What is Body Fat Percentage?

Body fat percentage is the total mass of fat divided by total body mass. This calculator uses the US Navy method, which uses body circumference measurements to estimate body fat. While not as precise as DEXA scans, it provides a reasonable estimate without equipment.

How to Measure

Neck: measure just below the larynx. Waist (men): measure at the narrowest point, usually at the navel. Waist (women): measure at the narrowest point. Hips (women): measure at the widest point around the buttocks.

שאלות נפוצות

How accurate is the Navy body fat formula?

The US Navy method has an error margin of about 3–4% compared to DEXA scans. It's a practical estimate for tracking trends over time.

What is a healthy body fat percentage?

For men, 14–17% is fitness range and 18–24% is average. For women, 21–24% is fitness range and 25–31% is average.

Why do men and women have different body fat ranges?

Women naturally carry more essential fat due to hormonal and reproductive functions. This is physiologically normal and healthy.