The Body Mass Index

Input Weight kg lbs
Input Height cm in
 
 
Body Mass Index =
  Female Male
Underweight < 19 <20
Acceptable 19 - 25 20 - 25
Overweight 25 - 30 25 - 30
Obese 30 - 40 30 - 40
Morbidly Obese > 40 > 40

The formula is:

BMI = W / H 2

where W is the weight in kilograms and H is the height in meters.