According to the CDC growth charts, the average weight for an 11-year-old girl ranges from 28.1 to 55.3 kilograms (62 to 122 pounds) . The average weight for an 11-year-old girl is around 37.4 kg (82.5 lbs) based on CDC growth charts. Another source states that the average weight for an 11-year-old girl is around 36.9 kg (81.5 lbs) . The weight of an 11-year-old girl can vary depending on factors such as genetics, diet, and physical activity. It is important to note that children may experience growth spurts and variations in weight due to individual development, so it is best to consult with a doctor if there are any concerns about a childs weight.