The relationship between being very overweight and many medical conditions such as diabetes, high blood pressure and heart disease is well established. The question is, exactly how much excess weight is dangerous to your health?

The answer lies in your BMI or Body Mass Index. BMI is the ratio between body weight and body height. The higher your BMI, the higher your risk of developing one of these conditions.

To calculate your BMI, enter your height in feet and inches, and your weight in pounds in the boxes below, then click on the button marked "Compute.":

-A normal BMI is between 20 and 25

-A BMI between 25 and 30 is considered overweight and corresponds to a moderate risk of developing a chronic health condition. This occurs in 50% of the U.S. population

-A BMI over 30 is considered obese and corresponds to a high risk of developing a chronic health condition. This occurs in one in three Americans.