## How to calculate body fat

The US Navy created the Body Fat Army calculator to check military personnel’s physical health and efficiency, as well as to estimate body fat percentages based on US Army Recruitment Standards.

To find out whether you have a body fat percentage based on your age and gender, use our Army Body Fat Calculator.

## Body fat formula (U.S. Army Method)

Contrary to popular belief, the body fat percentage figure used by the US army is not dependent on any kind of BMI measurement. It’s focused on similarities between a person’s height and other body circumference measurements.
The US Army calculates body fat percentages using different formulas for men and women.
For men:

• Body Fat % = 86.01 x log10(waist – neck) – 70.041 x log10(height) + 36.76

For Women:

• Body Fat % = 163.205 x log10(waist + hip – neck) – 97.684 x log10(height) – 78.387

All dimensions are given in inches.

## How to use Army Body Fat calculator?

This Army Body Fat Calculator tool is used to determine a person’s fat percentage based on their height, neck, hips, and waist measurements. It also takes into account the individual’s age and gender.

Once you’ve entered your personal measurements, this method will assess your body fat and tell you whether you meet the US Army’s recruiting criteria or the Department of Defense’s more rigorous requirements.

## Body Fat Percentage Ranges

Body fat percentage is what portion of your overall body composition is fat and what portion is lean mass.Ideally, the body fat percentage for men should be between 12% and 20%.

### Ideal body fat percentage for men

Body mass index (BMI) is a rough estimate of body fat percentage, if you have a lot of muscle, body fat percentage is the best solution to achieve your goals.

To get the body mass index for man, the first step is to determine the actual body fat percentage, the second step is to calculate the desirable body mass (DBM).

DBM = free fat mass / (1- fat percentage suggested).
Most guys’ goal is to trim fat, with this equation you can define how many kgms of fat mass you have to lose, to reach your final goal.

Age Dangerously low Excellent Fair Poor dangerously high
21 – 30 <8% 8 – 10.5% 10.6 – 18.6% 18.7 – 23.1% >23.2%
31 – 40 <8% 8 – 14.5% 14.6 – 21.3% 21.4 – 24.9% >25
41 – 50 <8% 8 – 17.4% 17.5 – 23.4% 23.5 – 26.6% >26.7%
51 – 60 <8% 8 – 19.1% 19.2 – 24.6% 24.7 – 27.8% >27.9%
60> <8% 8 – 19.7% 19.8 – 25.2% 25.3 – 28.4% >28.5%

### Ideal body fat percentage for women

Age Dangerously low Excellent Fair Poor dangerously high
21 – 30 <14% 14 – 16.5% 16.6 – 22.7% 22.8 – 27.1% >27.2%
31 – 40 <14% 14 – 17.4% 17.5 – 24.6% 24.7 – 29.2% >29.3
41 – 50 <14% 14 – 19.8% 19.9 – 27.6% 27.7 – 31.9% >32%
51 – 60 <14% 14 – 22.5% 22.6 – 30.4% 30.5 – 34.5% >34.6%
60> <14% 14 – 23.2% 23.3 – 31.3% 31.4 – 35.4% >35.5%
It is also helpful to know your LBM (Lean Body Mass), you can easily calculate by using our free Body Mass calculator.