BMI Calculator

Body Mass Index, better known as BMI, is a way to measure body fat based on height and weight, and it serves as a common benchmark for bariatric surgeons. A healthy BMI falls between 18.5 to 24.9. While excess muscle mass can skew the number, BMI is a solid measure for the average adult. If you do not know your BMI, use the calculator below to find out.

If you’re considering weight loss surgery, you and your doctor should discuss your BMI and its implications on your current and future health.

How to use the BMI Calculator

  1. Enter your height and weight into the calculator below. Your result will be shown automatically.
  2. Compare your result to the National Institute of Health table:
Adult BMICategory
Below 18.5Underweight
18.5 – 24.9Normal
25.0 – 29.9Overweight
30.0 and aboveObese

You may be a candidate for weight loss surgery if your BMI is equal to or over 40. You may also benefit from bariatric surgery if your BMI is lower, but you have obesity-related health conditions.

The BMI calculator is a helpful tool for most women and men, with the following exceptions:

  • Athletes with a muscular build may show exaggerated BMI
  • Older people or people who have lost muscle may show lower BMI
  • Different interpretations apply for children and teens than adults

Please talk with your doctor if you feel like the BMI calculator is not an accurate measure of body fat.

BMI Calculator

Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women.Enter the following information and calculate your BMI.

Your results:

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Being underweight may weaken your immune system and increase the risk of malnutriation and osteoporosis.
Maintaining a healthy weight reduces the risk of serious health conditions such as high blood pressure, heart disease, stroke and diabetes.
Some of the benefits of achieving a healthy weight include decreased risk of heart disease, stroke and diabetes, increased energy and improved self - esteem.
Some of the benefits of achieving a healthy weight include decreased risk of heart disease, stroke and diabetes, increased energy and improved self - esteem.

Underweight

Less than 18.5

Normal

18.5 to 24.9

Overweight

25 to 29.9

Obese

30 or greater

  • Note: Results of the BMI calculator are based on averages.
  • Privacy Assurance: Information that you enter will not be saved or sent to any website.
  • Source: National Heart, Lung, and Blood Institute; National Institutes of Health; U.S.Department of Health and Human Services.

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