What is BMI?

Body Mass Index (BMI) is a measurement used to assess health risks of Obesity


The Body Mass Index or BMI is the most commonly used method for determining a patient’s weight category and body size. It is used to measure whether you are in a healthy weight range for your height. 


BMI is calculated by dividing your weight in kilograms  by your height in metres squared.

 

An adult with a BMI of 30 or more is considered Obese.

 

BMI is usually a good indicator of body fat  for most people; however, BMI does not differentiate between body fat and muscle mass. Therefore, those with a lot of muscle bulk will have a high BMI, but are not necessarily overweight or obese.

 

It’s important to note that a reputable doctor  should determine an individual’s personal BMI to assess whether their BMI or excess weight poses a health risk.


An individual’s BMI should not be used alone to assess Obesity.

 

Further assessments for the diagnosis of Obesity include:


  • Blood Tests
  • Physical Examination
  • Review of Family History
  • Waist Measurement
  • Skinfold Thickness Measurements
  • Evaluation of Diet & Physical Activity



Classifying Obesity

Category BMI Range
Normal Size 18.9 to 24.9
Overweight 25 to 29.9
Class I, Obesity 30 to 34.9
Class II, Serious Obesity 35 to 39.9
Class III, Severe Obesity 40 and greater
Class IV, Super Obesity 50 and greater

BMI Calculator