BMI is a number calculated by dividing a person’s weight in kilograms by his or her height in meters squared. BMI is used in determining obesity. Obesity is most commonly calculated using BMI. An adult with a BMI of 30 or greater is clinically obese. BMI is not used to determine a person’s actual percentage of body fat, but it is a good indicator to categorize weight in terms of what is healthy and unhealthy.


The Union health ministry last year slimmed down the Body Mass Index (BMI) to 23 kg/m2 as against 25 kg/m2 globally. The primary reason to lower BMI levels was to fight the danger of India becoming a diabetes hub by 2050.

BMIWeight Status
Below 18.5Underweight
18.5 - 22.9Normal
23.0 - 29.9Overweight
30.4 - 34.9Obese ( Class I )
35.0 - 39.9Obese ( Class II )
40.0 and HigherExtreme Obesity ( Class III )

How to Calculate your BMI


Body Mass Index = Weight (in kilograms ÷ Height (in m2)
Example: A woman weights 70 kg and is 1.7m tall.

What is her BMI?

Body Mass Index = Weight ÷ Height2
24 = 70 kg ÷ (1.7m x 1.7m)