One of the biggest questions guys and girls have as they grow and develop is whether they're the right weight. One place to start is by learning about body mass index, or BMI, a calculation that estimates how much body fat a person has based on his or her weight and height.

Check out our BMI calculator to find out what your BMI is. Although you can calculate BMI on your own, it's a good idea to ask a doctor or health professional to help you figure out what it means.

Reviewed by: Mary L. Gavin, MD
Date reviewed: January 2009

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