Body Mass Index (BMI) and ZScore Calculation in Children
Instructions. This web page allows you to calculate the body mass index (BMI) of your patients between the ages of 2 and 20 years, as well as the exact BMI percentile and zscore (standard deviation), based on the Center for Disease Control (CDC) growth charts. Zscores are particularly useful to monitor changes in patients with a BMI above the 99th percentile or below the 1st percentile.