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 18.5Underweight
18.5-24.9Normal weight
25-29.9Overweight
30 and higherObese
Note: The BMI may not be accurate for people with greater muscle mass (such as athletes) or in older people and others who have lost muscle mass.

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.

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.

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