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 because of his or her weight. As a point of reference, someone with a BMI of 27 is approximately 20 percent overweight.The higher the BMI, the greater the risk a person has to develop additional health problems.
| Underweight | Less than 18.5 |
| Normal | 18.5 -- 24.9 |
| Overweight | 25 -- 29.9 |
| Obesity I | 30 -- 34.9 |
| Obesity II | 35 -- 39.9 |
| Extremely Obese III | 40 and over |
To calculate your BMI, enter your height in feet and inches and your weight in pounds (lbs) in the boxes below and then click on the button marked "Calculate":