What is a BMI Calculator and Why Is it Used?

The Body Mass Index calculator is one method used to determine obesity. Board certified Houston-area general surgeon Dr. Matthew St. Laurent uses this and other tools to help patients clearly set their ideal weight reduction goals.

A person’s Body Mass Index, or BMI, is a number that is calculated based on his or her weight and height. Calculating a patient’s BMI is the primary tool used by Dr. St. Laurent to identify weight problems, along with other tools to determine further details of your specific build and the best weight loss solutions for your body type.

The Body Mass Index does not indicate body fat composition but is a simple range for both men and women to identify individuals as underweight, average/healthy weight, overweight or obese. A BMI number indicates if a person is within the average body weight range for his or her sex and height, or outside of it- and this is why bodybuilders and people with a lot of muscle mass who are unusually heavy in relation to their heights will have a high BMI even though they are not overweight due to unhealthy body fat percentage. However, barring these exceptions, a person’s BMI is generally a good indicator of body type. This calculation alone should not be used for children and teenagers under the age of 20, since their bodies are still developing.

Within the range of the Body Mass Index, a BMI number between 18.5 and 25 is considered to be a healthy height-to-weight ratio, while a number from 25 to 30 indicates an individual is overweight for his or her height. Anyone with a BMI number above 30 is considered to be at an obese weight. It is important to remember that the BMI calculation is only a preliminary test- to discover if a person’s extra weight presents a risk to his or her health, further diagnostic testing is required.

Plug your height and weight into the calculator below to find out if your basic BMI number is in the underweight, normal/healthy weight, overweight, or obese category.

Should this BMI calculator show you are obese, contact Dr. Matthew St. Laurent at his Houston clinic. He can provide you with practical advice to help manage your obesity and can be contacted at 281-921-1890.

BMI Calculator

If you want to compare your weight status to others,
BMI is a great method of analysis.​

BMI Classification Health Risk
Under 18.5 Underweight Minimal
18.5 – 24.9 Normal Weight Minimal
25 – 29.9 Overweight Increased
30 – 34.9 Obese High
35 – 39.9 Severely Obese Very High
40 and over Morbidly Obese Extremely High
Dr. Matthew St. Laurent

Northwest Endosurgical

At Northwest Endosurgical in Houston, Texas, Dr. Matthew St. Laurent helps patients achieve dramatic weight loss and improved health through bariatric surgery. Dr. St. Laurent is one of the most experienced bariatric surgeons in greater Houston, and he is affiliated with several professional organizations, including:

  • The American Society for Metabolic and Bariatric Surgery
  • The American College of Surgeons
  • The Society of American Gastrointestinal Endoscopic Surgeons
  • The Obesity Action Coalition
  • The American Medical Association
  • The Texas Medical Association
  • The International Federation for the Surgery of Obesity and Metabolic Disorders (IFSO)

To schedule a consultation, book online or give us a call at (281) 921-1890.

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