A healthy teen weight to height ratio depends on many factors, it's not uncommon for different countries and cultures to have significant differences. It is not as simple as falling into the appropriate range standard charts. What is an appropriate weight will be based on:
Age
Height
Weight
BMI (Body Mass Index)
 
How do I know if the child or teenager is healthy?
SHANGHE SH-700G Body Weight Height Scale for child is a fully automatic system which measures the human body weight, height, calculate the BMI and the data will be displayed. Then you can find out if a child or teenager is a healthy weight for their age using the healthy weight calculator.