# Child BMI calculator

The body mass index is used to define a person’s build

### Interpreting a Child’s BMI

The **BMI calculation** formula is the same for both adults and children, but the result is interpreted differently.

#### A child’s BMI using the body build curve

After calculating the child’s BMI, you will need to check the result against the body mass curve, which will depend on the child’s age and height. However, the **BMI for a** **boy** and **girl** are interpreted differently, because the body mass curves differ from one gender to the other.