Program for calculating Body Mass Index (BMI).
The formula is:
BMI = weight / (height ^ 2)

weight can be expressed in the unit kg or libbra
height can be expressed in the unit meter or inch

The following are common definitions of BMI categories:

<15   = Starvation
<17.5 = Anoretic
<18.5 = Underweight
<25   = Ideal
<30   = Overweight
<35   = Obese I
<40   = Obese II
<60   = Obese III (Morbidly Obese)

Read 
http://en.wikipedia.org/wiki/Body_mass_index
for more details.
