Obesity Classification

Extended International (IOTF) Body Mass Index Cut-Offs for Thinness, Overweight and Obesity in Children

The revised international child cut-offs are available corresponding to the following body mass index (BMI) cut-offs at 18 years:

• 16       thinness grade 3
• 17       thinness grade
• 18.5    thinness grade 1
• 23       overweight (unofficial Asian cut-off)
• 25       overweight
• 27       obesity (unofficial Asian cut-off)
• 30       obesity
• 35       morbid obesity

The cut-offs are given for exact ages by month from 2 to 18 years.

• Boys 
• Girls