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.
Body mass index can be calculated in three units as SI, US and UK units.
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/in 2 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.
