Right!  

BMI = w/h² where:

w = weight in kilograms (pounds divided by 2.2)
h = height in meters (inches divided by 39.4)
 
OR: BMI = Weight in pounds divided by ( height in inches times height in inches ) times 703. That is (in Imperial units): BMI = w/h² x 703
 
For Adults;
 
   •  below 18 on the BMI scale is considered anorexic.
   •  between 19 & 25 is "good".
   •  26 to 30 is considered overweight.
   •  30 or above is considered obese.
   •  40 or above is considered morbidly obese.
 

Obese children are prone to orthopedic & respiratory problems, along with a high risk for other illnesses. Causes of childhood obesity include:

Heredity

Lack of exercise

Television

Cultural attitudes

Precipitating events