Body Mass Index (BMI) Calculator
Enter your height and weight below to find your body mass index (BMI). This number is commonly used to judge whether your weight is healthy—or whether extra weight increases your risk for health problems, such as cancer.
Calculate Your BMI
What the Numbers Mean
| BMI | Condition |
|---|---|
| Below 18.5 | Underweight |
| 18.5-24.9 | Normal weight |
| 25-29.9 | Overweight |
| 30 and higher | Obese |
If you are overweight or obese, even a small weight loss (10% of your current weight) lowers the risk of several diseases. People who are overweight or obese have a greater chance of developing certain cancers—including breast cancer for women over age 50—as well as high blood pressure, high blood cholesterol or other lipid disorders, diabetes, heart disease, and stroke.
Being very underweight – especially if you’ve had rapid or unintentional weight loss – can be a sign of health problems.
A doctor can further assess your personal risk for serious weight-related diseases by considering your BMI, waist size, and other measures of health such as blood sugar levels.
More Interactive Tools
- How Many Calories Do You Need
- Find the Calories Burned During Exercise and activities of daily living.
- Compute your best workout with the Target Heart Rate Calculator.