Normal Body weight
Types of Body Weights: Ideal Body Weight (IBW) Vs Total Body Weight (TBW) Vs Adjusted Body Weight
Try to find type of your body and then know how much should be your normal weight. Read more here
Normal body weight – asults
Normal Body weight
Normal Weight for Height and Age
http://www.buzzle.com/articles/normal-weight-for-height-and-age.html