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Body Fat Calculator

Estimate your body fat percentage, lean body mass, and fat mass using the U.S. Navy circumference method.

Gender
kg
cm
cm
cm

Enter your measurements to calculate your body fat.

What is the U.S. Navy Method?

The U.S. Navy Method is a widely used algorithm to estimate body fat percentage based on simple tape-measure circumferences. While not as exact as a DEXA scan, it provides a highly reliable estimate that is easy to track over time at home.

How to Measure Correctly

  • Height: Stand straight without shoes.
  • Neck: Measure below the larynx (Adam's apple) sloping slightly downward to the front. Do not flex the neck.
  • Waist: Measure at the narrowest point of your abdomen (for men, typically at the navel; for women, just above the navel). Do not suck in your stomach.
  • Hips (Women only): Measure at the widest point of your hips and buttocks.

Body Fat Categories (American Council on Exercise)

Your body fat percentage places you into one of the following categories:

  • Essential Fat: Men 2-5%, Women 10-13%
  • Athletes: Men 6-13%, Women 14-20%
  • Fitness: Men 14-17%, Women 21-24%
  • Average: Men 18-24%, Women 25-31%
  • Obese: Men 25%+, Women 32%+

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Frequently Asked Questions

How to use Body Fat Calculator

  1. 1

    Enter your details

    Open Body Fat Calculator and type your values into the fields. Estimate your body fat percentage, lean body mass, and fat mass using the U.S. Navy Method.

  2. 2

    See the result instantly

    The result updates automatically as you type — no button to press. All calculations run locally in your browser; nothing is sent to a server.

  3. 3

    Adjust or copy

    Change any input to recalculate immediately, then copy or note the result.