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Body Mass Index Calculator


Body Mass Index Calculator

What Is Adult BMI?

Body Mass Index or BMI is based on your height and weight. Doctors often use BMI to determine if a person is underweight, at a healthy weight or is overweight. While BMI is accurate for most people, it doesn't work for everyone. It's important to remember that:

  • If you are under 20 years old or pregnant or breast-feeding, the BMI calculator does not apply to you.
  • You could have a high BMI but be at a weight that is considered healthy if you're muscular or athletic.
  • You could have a normal BMI and have poor nutrition.
  • It's important to talk to your doctor about weight-related health risks.


  • Centers for Disease Control and Prevention. Body Mass Index.
    Available at
    Accessed May 1, 2007.
  • The Practical Guide: Identification, Evaluation and Treatment of Overweight and Obesity in Adults. National Institutes of Health. National Heart Lung and Blood Institute. October 2000.