BMI is a number based on your weight and height. In general, the higher the number, the more body fat a person has. BMI is often used as a screening tool to decide if your weight might be putting you at risk for health problems. A BMI greater than 30 may be an indicator for serious health risks such as heart disease, diabetes, and cancer. Although BMI calculations do not accurately account for your true body fat percentage, it is currently the most widely used standard.
If your BMI is below 18.5 you may be considered underweight. If your BMI is between 18.5 - 24.9, you are considered normal weight. If your BMI is between 25 - 29.9 you are considered overweight. If your BMI is above 30, you are considered obese. If your BMI is between 30 -35 it is obesity class I. If your BMI is between 35 -40 it is obesity class II. If your BMI is greater than 40 it is obseity class III.