In children, BMI is calculated in the same way as adults, but the healthy and unhealthy ranges are determined in a different way. We do not have fixed values to determine healthy and at-risk thresholds in children. Children’s BMI values are compared with other children of the same age and sex, and a percentile is calculated. The BMI value is below the 5th percentile for children, they are underweight. If the BMI value is over 95th percentile value, they are obese. A value within 85th and 95th percentile is overweight and from the 5th to 85th percentile, the value is normal.