Body Fat Index Calculator

The body fat index calculator (or body fat percentage calculator) below uses standards based on the U.S. Navy Circumference Method. The equations used in Military body fat calculators have been found to be the most reliable form of body fat percentage measurement.

(Note: Don't confuse Body Fat Index with Body Mass Index (BMI) it's not the same thing. BMI categorizes your height / weight measurements only. See our BMI calculator chart.)

For men three body measurements (height, neck circumference and waist) are used to estimate the percentage of body fat.
Fore women four body measurements (height, neck, waist and hips circumference) are used to calculate the body fat percentage.

Take measurements as following:

Height: measured without shoes
Waist Circumference: Men measure at the navel height, Women measure at the narrowest point
Neck Circumference: Measure just below the larynx (it will be a slightly downward sloping measurement)
Hips Circumference: (women only) at the widest point

Navy Body Fat Index Calculator
Male Female
Metric Imperial
Centimeters Inches
Height:
Neck:
Waist:
Hips:

Body Fat Percentage:

The body fat index calculator calculates body fat percentage using formulas from the Naval Health Research Center. Men and women require different calculations because men tend to accumulate fat around the waist (the apple body shape) while women tend to accumulate fat in the hips and buttocks (the pear body shape).

Body fat percentage categories by the American Council on Exercise:

	Women	Men
Essential fat	10-12%	2-4%
Athletes	14-20%	6-13%
Fitness	21-24%	14-17%
Acceptable	25-31%	18-25%
Obese	32% or more	26% or more

I prefer the body fat percentage categories published by the World Health Organization and National Institutes of Health as they take age into account.

Body fat percentage categories for Women

Age	Under fat	Healthy Range	Overweight	Obese
20-40 yrs	< 21%	21-33%	33-39%	> 39%
41-60 yrs	< 23%	23-35%	35-40%	> 40%
61-79 yrs	< 24%	24-36%	36-42%	> 42%

Body fat percentage categories for Men

Age	Under fat	Healthy Range	Overweight	Obese
20-40 yrs	< 8%	8-19%	19-25%	>25%
41-60 yrs	<11%	11-22%	22-27%	> 27%
61-79 yrs	< 13%	13-25%	25-30%	> 30%

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Body Fat Calculator
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