Determining how much your adolescent should weigh is not a simple matter of looking at an insurance height-weight chart, but includes considering the amount of bone, muscle, and fat in his/her body's composition. The amount of fat is the critical measurement.
A good indicator of how much fat your adolescent carries is the Body Mass Index (BMI). Although it is not a perfect measure, it gives a fairly accurate assessment of how much of your adolescent's body is composed of fat.
BMI can be calculated using kilograms and meters.
BMI = Weight in Kilograms
(Height in Meters) x (Height in Meters)
For example, a person who weighs 99.79 Kilograms and is 1.905 Meters tall has a BMI of 27.5.
99.79 Kg = 27.5
(1.905 Meters) x (1.905 Meters)
A BMI between 25 to 29 is considered overweight. Anything over 30 is considered obese.