Calculate body fat percentage

I am: male
female
Height: cm
Waist circumference: cm
Hip circumference: cm
Neck circumference: cm
Weight: kg
If you enter your body weight, you will also get your body fat mass.
  Save values (info)

The body fat percentage calculator calculates an estimate of body fat percentage using waist circumference, neck circumference and height. For women, the calculator also takes into account hip circumference. The calculator uses the US Navy Method.

Body fat percentage refers to the amount of fat mass in relation to total body mass. The American Council on Exercise has created body fat percentage reference values for different fitness levels.

Body fat percentage reference values

Men Women
Necessary amount of fat 2−5 % 10−13 %
Athletes 6−13 % 14−20 %
Fitness athletes 14−17 % 21−24 %
Healthy average 18−24 % 25−31 %
Overweight 25 % and above 32 % and above

Measuring waist circumference

You measure your waist circumference with a tape measure 2 cm above your navel. Breathe out normally and at the end of your exhalation - when your stomach is at its smallest - look at the measurement result. Hold the tape measure lightly around your waist. It should not be too loose, but not too tight either.

Measuring the neck circumference

You measure the neck circumference with a tape measure just below the Adam's apple. The person being measured should keep their shoulders relaxed and their gaze straight ahead, with their chin in a neutral position without tensing the muscles of the neck or nape.

Measuring the hip circumference

You measure the hip circumference with a tape measure at the widest point of the hips. Take the measurement while standing.

Formulas for calculating body fat percentage

The formula for calculating body fat percentage for men is

body fat percentage = 495 / (1.0324 − 0.19077 × log10(waist circumference − neck circumference) + 0.15456 × log10(height)) − 450

The formula for calculating body fat percentage for women is

body fat percentage = 495 / (1.29579 − 0.35004 × log10(waist circumference + hip circumference − neck circumference) + 0.22100 × log10(height)) − 450

Sources:

Robert Wood, "Measuring Body Fat Using Girths." Topend Sports Website, first published October 2008, https://www.topendsports.com/testing/bodyfat-girths.htm, Accessed 26 February 2025.

PULMONARY, CRITICAL CARE AND SLEEP SPECIALISTS, PA. Tips to measure Neck Circumference. 26.2.2025. https://lungandsleepdocs.com/tips-to-measure-neck-circumference/

Shaheen, A., Javed, N., Azam, F., Liaquat, A., Khan, M., Alam, S. M., & Mumtaz, S. (2019). Comparison of Bioelectrical Impedance and Navy Seal Formula to Measure Body Composition in Medical Students. Cureus, 11(5), e4723. https://doi.org/10.7759/cureus.4723