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# Calculating % Bodyfat - Girth Method

Body fat is only one part of the composition of the human body, and it is particularly important to monitor the fat levels for health and for athletes. There are many ways of estimating the body's fat percentage. The methods described below are calculations based on simple girth or circumference measurements. See the information about %body fat, and also using skinfold measures to calculate %bodyfat.

## BF% from Girth Measurements

There are formula from the US Department of Defense to compute body-fat percentage using girth measurements and height. There are different formula for males and females. The males require girth measures of the neck and abdominal girth. The females require girths of the neck, waist and hip. You will need a scientific calculator to determine the log calculations.

### Using Imperial Units (inches)

This is the formula (Hodgdon and Beckett, 1984) that was taken from the Navy website, and is seen elsewhere on the internet. Note, all measurements are in inches (measured to the nearest 1/4 inch), including height.

• males: % body fat = 86.010 x log10(abdomen - neck) - 70.041 x log10(height) + 36.76
• females: % body fat = 163.205 x log10(waist + hip - neck) - 97.684 x log10(height) - 78.387

### Using Metric Measurements (cm)

This is believed to be the metric version of the Navy body fat formula. Note, all measurements are in centimeters to the nearest 0.5 cm, including height.

• males: % body fat = 495/(1.0324-0.19077(log(waist-neck))+0.15456(log(height)))-450
• females: % body fat = 495/(1.29579-0.35004(log(waist+hip-neck))+0.22100(log(height)))-450

This is another formula found online, but there was no mention of the original source. For the females, there are additional measurements needed compared to the formula above.

• males: % body fat = (76.5 * LOG10((abdomen) - (neck))) - (68.7 * LOG10(height)) + 46.9
• females: % body fat = (105.3 * LOG10(weight)) - (0.200 * (wrist)) - (0.533 * (neck)) - (1.574 * (forearm)) + (0.173 * (hip)) - (0.515 * (height)) - 35.6

## References

• Hodgdon, J.A. and M.B. Beckett (1984) Prediction of percent body fat for U.S. Navy men from body circumferences and height. Report no. 84-11, Naval Health Research Center, San Diego, CA;
• Hodgdon, J.A. and M.B. Beckett (1984) Prediction of percent body fat for U.S. Navy women from body circumferences and height. Report no. 84-29, Naval Health Research Center, San Diego, CA.