Weight-Length WHO 0-2 years Weight-Height WHO 2. Weight Age 2-20 Stature-Age 2-20 Weight-Stature 2-20. Pin On Health And Fitness This calculator provides your childs weight percentile based on age. . You can also find a companion adult weight distribution calculatorAlso try our BMI Calculator to compute a. The thicker red line in the middle is the 50 th percentile or the average weight if you prefer which indicates that 50 of the population of boys has a weight that is heavier than the line and 50 of boys are lighter. Percentile - The weight percentile of the child. 1 that was developed using data published by the United States Centers for Disease Control and Prevention CDC. Predicted percentiles and Z-scores much over the 95th percentile using the CDC charts may be inaccurate. The older you get the higher your BMI is allowed to be. Get results based on US CDC data for adolescents. Eg 8-4 for 8 lb and 4 oz ...