Body mass index:Classification:
< 16Pronounced deficit of body weight
16 – 18.5Insufficient body weight
18.5 – 25Normal body weight
25 – 30Overweight (pre-obesity)
30 – 35Obesity of the 1st degree
35 – 40Obesity of the 2nd degree
> 40Obesity of the 3rd degree

Body mass index online

Body Mass Index: count your own!