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Body Mass Index Tutorial

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BMI Definition:

  Body Mass Index is a statistical measure of the body fat scaled according to your ideal height and ideal weight. It has five categories which are listed in the table below.

CategoryBMI range
Starvation less than 15
Underweight from 15 to 18.5
Normal from 18.5 to 25
Overweight from 25 to 30
Obese greater than 30

 Hence from the table BMI should always be less than 25.

BMI Formula:

 Body mass index can be calculated in three units as SI, US and UK units.

SI Units:

 BMI = weight(kg) / height²(m²)

US Units:

 BMI = 703 X weight(lb) / height²(in²)
 where,
 1kg = 2.2lbs.
 1cm = 0.39inches.

UK Units:

 BMI = 6.35 X weight(kg) / height²(m²)

Example:

 Consider a person's weight as 75kg and height as 157cm. Calculate BMI for the person.

 SI Units = weight(kg) / height²(m²)
             = 75 / (15.7)²  
             = 30kg/m²

 US Units = 703 X (weight(lb) / height²(in²))
             = 703 X ((75X2.2) / (157X0.39)²)  
             = 30lb/in²

 UK Units = 6.35 X weight(kg) / height²(m²)
             = 6.35 X (75 / (15.7)²)  
             = 193kg/m²

 Hence your category will be Obese.



This tutorial will help you dynamically to find the BMI.

Related Article:
>> BMI Chart