Body Mass Index (BMI) – is it the best measure of obesity?


          In my post “What is Obesity – is it merely about BMI? What is obesity? I had defined obesity as an abnormal accumulation of fat such that health is impaired. Body Mass Index is the most widely used measure of identifying obesity. However, in my post, I had cautioned that contrary to the general perception, obesity is not about BMI. In this post, I will be discussing what is Body Mass Index, its advantages and limitations. In addition to describing the method for calculation of BMI, for the ease of readers, I will be briefly discussing ‘BMI calculator tool’ and ‘BMI charts’.

What is Body Mass Index

Body Mass Index is a simple index of weight-for-height that is commonly used to assess ‘normalcy’ for body weight. It is defined as the body mass divided by the square of the body height. It is universally expressed in units of kg/m2, resulting from body mass in kilograms and height in meters. If pounds and inches are used as a measure of body mass and height respectively, a conversion factor of 703 is used. The formula for calculation of Body Mass Index  is as under:

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