Learn BMI Online - What is Body Mass Index?

Body Mass Index Tutorial

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Body Mass Index

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.

Category	BMI 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 Calculator:
>> Calculate Body Mass Index(BMI) online

Related Article:
>> BMI Chart