Teenage years are a time of huge structural changes in the body as a result of puberty. As such, weight gain during these formative years is variable, yet normal.
On average, 15-year-old boys have a height of 67 inches, and 15-year-old girls have a height of 64 inches. At this age, height usually ranges from 61 inches to 73 inches for boys and 59 inches to 69 inches for girls.
Average weight for 15-year-old boys is 124 pounds and 116 pounds for girls. Most boys of this age range from 90 pounds to 184 pounds and girls generally weigh from 86 pounds to 180 pounds.
A key indicator of whether you are in a healthy weight range is the body mass index (BMI), which measures body fat based on height and weight. Although BMI is unstable in teenagers as a result of varied and rapid growth rates, it can give you an idea of whether you are in a healthy weight range. You can calculate BMI by using online BMI tools or consulting a doctor.