Body mass index (BMI) is a measurement based on height and weight as it relates to body fat, and can be used to determine how much risk a person has of developing certain health problems due to his or her weight. Someone with a BMI of 27 is about 20 percent overweight.The higher the BMI, the greater the risk a person has to develop additional health problems.

Underweight	Under 18.5
Normal	18.5 to 24.9
Overweight	25 to 29.9
Obesity Level 1	30 to 34.9
Obesity Level 2	35 to 39.9
Obesity Level 3	40 and over