Body Composition

The Body Mass Index (BMI) can be easily calculated to assess your body composition. Calculate your BMI in Worksheet 1-3 and compare it to the classifications.

Worksheet 1-3. Calculate Your BMI

Your BMI =

body weight (lbs)

height (inches)

ratio

Ratio: Classification:

<2G Underweight

2G-25 Normal

25-3G Overweight

>3G Obese

The BMI classifications have been developed to identify individuals at risk for being either over- or underweight. However, BMI can misclassify some large frame or muscular people as overweight. It is strictly a ratio and does not necessarily reflect percent body fat accurately. If you feel your BMI incorrectly categorizes you, have your percent body fat measured by a trained professional. Body fat can be determined from a variety of techniques including hydrostatic (underwater) weighing, skinfold measurements, and circumference measurements (as done in the Navy).

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