The average weight of a 15-year-old boy is dependent on a number of factors, including height, body mass index, ethnicity and diet. For a 15-year-old male who is 67 inches tall, the average weight is approximately 120 pounds.
The normal weight for a 15-year-old male ranges from below 100 pounds to over 170 pounds and correlates with height and body mass index. Boys that are taller or that have a higher body mass index tend to be heavier, but this does not necessarily indicate that they are unhealthy or should lose weight to attain the average of 120 pounds. It is important to consult a physician to determine the healthiest weight for an individual at any age, and an average weight and height is not a guarantee of good health.