IsoBMI - BMI for children

Because BMI does not work for children and adolescents, the IOTF (International Obesity Task Force), has produced an extension of BMI that also works for children. BMI for children is called isoBMI and the value is calculated in the same way as BMI for adults. However, the limits for classification of overweight and obesity varies for all ages from 2 to 18 years.

Test your child's BMI

Height: cm
Weight: kg
Age: year
To avoid having to use an awkward translation table, we have developed a program that automatically tells you if your child has normal weight, overweight or obesity. Remember to take the results with a grain of salt. All children are different and have different bodies and conditions.

BMI-table

The table translates the results from normal BMI to weight classifications for children and young people under 18. If either weight class being overweight or obese is in the your probably normal weight. Note that underweight is defined for children.



Age: Overweight: Obesity:
Boys Girls Boys Girls
2 18,41 18,02 20,09 19,81
2,5 18,13 17,76 19,80 19,55
3 17,89 17,56 19,57 19,36
3,5 17,69 17,40 19,39 19,23
4 17,55 17,28 19,29 19,15
4,5 17,47 17,19 19,26 19,12
5 17,42 17,15 19,30 19,17
5,5 17,45 17,20 19,47 19,34
6 17,55 17,34 19,78 19,65
6,5 17,71 17,53 20,23 20,08
7 17,92 17,75 20,63 20,51
7,5 18,16 18,03 21,09 21,01
8 18,44 18,35 21,60 21,57
8,5 18,76 18,69 22,17 22,18
9 19,10 19,07 22,77 22,81
9,5 19,46 19,45 23,39 23,46
10 19,84 19,86 24,00 24,11
10,5 20,20 20,29 24,57 24,77
11 20,55 20,74 25,10 25,42
11,5 20,89 21,20 25,58 26,05
12 21,22 21,68 26,02 26,67
12,5 21,56 22,14 26,43 27,24
13 21,91 22,58 26,84 27,76
13,5 22,27 22,98 27,25 28,20
14 22,62 23,34 27,63 28,57
14,5 22,96 23,66 27,98 28,87
15 23,29 23,94 28,30 29,11
15,5 23,60 24,17 28,60 29,29
16 23,90 24,37 28,88 29,43
16,5 24,19 24,54 29,14 29,56
17 24,46 24,70 29,41 29,69
17,5 24,73 24,85 29,70 29,84
18 25 25 30 30