What is the Body Mass Index?
Physicians often use the Body Mass Index to determine a person’s weight risks. The BMI compares weight to height. When a person’s BMI is greater than 30, that person is considered obese. When a person’s BMI exceeds 40, that person is considered morbidly obese.
Your BMI can be calculated here.
< 18.5 = underweight
18.5–24.9 = normal weight
25.0–29.9 = overweight
30.0–34.9 = class I obesity
35.0–39.9 = class II obesity
≥ 40.0 = class III obesity
You can also visit the Centers for Disease Control to learn more about obesity.
Centers for Disease Control and Prevention: Obesity and Overweight Topics
Center for Disease Control and Prevention: Defining Overweight and Obesity
Table of weight, height and BMI
National Heart Lung and Blood Institute: Obesity Guidelines