What is BMI?

BMI is an abbreviation for Body Mass Index. The index takes into account the weight and height of a person for the purpose of determining his current health status. By using this index, one can compute whether a person is underweight, overweight or fit. Bariatric Surgery Consultants often make use of this tool to guide their patients in weight loss programs.

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Computation of BMI

BMI can be computed in two different ways. On one hand, there is the Metric system and on the other hand, there is the Imperial system. The Metric System uses kilograms (kgs) and meters (m) input for the purpose of computation and the Imperial system uses pounds (lbs) and inches input for the purpose of computation. Additionally, the formula for BMI under metric system is computed by dividing the weight of a person by the whole square of his height. Whereas, the formula for BMI under imperial system multiplies the weight of person by 703 and divide the result by the whole square of his height.


Let’s take a practical example-

Weight of a person is 90 kilograms and the height is 1.9 meters.

Computation of BMI under Metric System:
Weight= 90 kgs,
Height= 1.92 m
Therefore, BMI would be  = 90/3.61                          [Note: whole square of 1.92 is 3.61]
= 24.93


Computation of BMI under Imperial system:
Weight= 190 lbs,
Height= 72 inches
Therefore, BMI would be  = 190 x 703/5184              [Note: whole square of 72 is 5184]
= 25.76


Obesity Surgery Consultants in India recommend the following chart:

BMI Status
Below 18.5 Underweight
From 18.5 to 25 Healthy Weight
From 25 to 30 Overweight
From 30 to 40 Obese
Above 40 Excessively Obese

So, have you checked your BMI today? To know more about obese related problems feel free to contact ILS Bariatric Consultants.