Normal weight: body mass index = 18-25.
Overweight: body mass index = 25-30.
Mild obesity: body mass index >; 30
Moderate obesity: body mass index >; 35
Severe obesity: body mass index >; 40
Standard weight of children
Standard weight method body mass index method
Standard weight method
Standard weight = age x 2+8 (7- 16 years old)
Mild obesity: 20%-30% overweight.
Moderate obesity: 40%-50% overweight.
Severe obesity: more than 50% of standard weight.