Body mass index (BMI) is a value derived from the mass (weight) and height of a person. It is a convenient rule of thumb used to broadly categorize a person as underweight, normal weight, overweight, or obese.
The BMI is defined as![](/wiki/plugins/servlet/confluence/placeholder/unknown-macro?name=mathinline&locale=en_US&version=2)
Commonly accepted BMI ranges are:
| |
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Underweight | < 18.5 |
Normal weight | 18.5 - 25 |
Overweight | 25 - 30 |
Obese | > 30 |