According to the U.S. Centers for Disease Control, the average weight of a 14-year-old boy is slightly more than 110 pounds, while the average weight for a 14-year-old girl is just under 110 pounds. The CDC provides growth and weight charts for infants, children and teenagers.
These weights are not ideal for each individual; they are simply average for the age. The ideal weight for any single adolescent depends upon the relationships among age, height and weight. The CDC has a body mass index calculator on its website that combines these factors and determines if a teen has a healthy or unhealthy weight. The website also provides a link for information about accurately measuring height and weight at home.