# How to Accurately Calculate BMI

By Brian Bowden ; Updated July 18, 2017

BMI stands for body mass index. According to the National Strength and Conditioning Association (NSCA), BMI is the preferred body composition assessment for obese individuals. The association states that the BMI classifications are as follows: less than 18.5 is considered underweight, 18.5 to 24.9 is normal, 25.0 to 29.9 is overweight and 30.0 to 39.9 is thought to be obese, while any BMI greater than 40 is considered extremely obese.

2. Determine your height in inches. For example, if you are 6 feet, 1 inch, list your height as 73 inches.

3. Square your height using a calculator. In other words, multiply your height by your height. For example, if your height is 73 inches, your equation looks like this: 73 x 73. Your height squared is 5,329.

6. Compare your BMI to the table available online by the National Institutes of Health. Using the information given, with a BMI of 32.9, you would be classified as obese.

7. #### Tip

If you don't have paper, pencil and a calculator available, the Centers for Disease Control and Prevention and the American Council on Exercise provide an online BMI calculator that's easy to use -- all you need to know is your weight and height.

#### Warnings

If you are athletic or have a muscular build BMI, the American Council on Exercise states that you should use your BMI in conjunction with other body composition assessments. A person with well-developed muscles can mistakenly appear overweight or obese according to their BMI score.

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