Free Body Fat Calculator — U.S. Navy Method — Uttir
Uttir

Body Fat Calculator

Estimate body fat percentage using the U.S. Navy circumference method. Tape measure and a few seconds — no scales required.

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Body Fat Calculator — The U.S. Navy method estimates body fat percentage from a few circumference measurements — height, neck, waist, and (for women) hip. It correlates reasonably well with DEXA scans for most adults and only needs a tape measure.

All measurements stay in your browser.

Estimates use the U.S. Navy method and are approximations, not medical measurements or advice. Body composition varies widely — for accurate readings, consult a healthcare or fitness professional.

View source on GitHub

Was Body Fat Calculator useful?

Was ist Body Fat Calculator?

The U.S. Navy method estimates body fat percentage from a few circumference measurements — height, neck, waist, and (for women) hip. It correlates reasonably well with DEXA scans for most adults and only needs a tape measure.

Enter your measurements in inches, your weight in pounds, and the calculator returns your body fat percentage, the category, the equivalent fat mass, and the equivalent lean mass.

So funktioniert es

  1. Pick your sex

    The formula differs for men and women.

  2. Measure

    Neck (just below the larynx), waist (at the navel for men, narrowest point for women), hip (women, widest point).

  3. Read the result

    See your body fat %, the category, fat mass, and lean mass.

Beispiele

Male, 5'10", 170 lb, neck 15", waist 34"

Typical office worker, light training.

Ergebnis: ~19% body fat, fitness category

Female, 5'6", 140 lb, neck 13", waist 28", hip 36"

Active adult.

Ergebnis: ~24% body fat, fitness category

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Last reviewed: 2026-09-25