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.

Calculate Your BMI

What the Numbers Mean

BMI Condition
Below 18.5Underweight
18.5-24.9Normal weight
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.

If you are overweight or obese, even a small weight loss (10% of your current weight) can lower your risk of several diseases. People who are overweight or obese have a greater chance of developing several types of cancer—including colorectal cancer and breast cancer (for women past menopause)—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 your blood sugar level.

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