Body Mass Index (BMI) Calculator

To determine if you are overweight, of normal weight or underweight, you can calculate your body mass index (BMI), which describes body weight relative to height and is strongly correlated with total body fat content in adults:

A BMI between 18.5 and 24.9 is considered within the normal, healthy range; 25 to 29.9 is considered overweight; 30 or more is considered obese, and 40 or greater is considered extreme obesity. An exception is athletes, who have more muscle mass and less body fat than normal. They might have a BMI as high as 30 and yet not be obese. If your BMI falls under 18.5, you may be underweight; if so, you may want to ask your health care professional to assess your health.

Learn more in the Weight Management Health Topic A-Z.