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Body Fat Calculator (U.S. Navy)

Estimate body fat percentage from height, neck, waist and hip measurements with the U.S. Navy method.

Runs instantly in your browser — results update as you type.

How do I calculate my body fat percentage?

The U.S. Navy method estimates body fat from tape measurements: height, neck and waist for men, plus hips for women. It is usually within 3–4 percentage points of a DEXA scan when you measure carefully.

How to measure

  • Neck: just below the larynx (Adam’s apple), tape sloping slightly down to the front.
  • Waist: men at the navel; women at the narrowest point.
  • Hips (women): the widest part of the buttocks.

Measure relaxed, on bare skin, in the morning. Add your weight to see fat mass and lean body mass.

Frequently asked questions

What is a healthy body fat percentage?

Roughly 21–31% for women and 14–24% for men (fitness to average, ACE categories).

Is it better than BMI?

Yes for most people — BMI cannot tell muscle from fat.

Can I use inches?

Yes, switch the units to imperial.