With obesity rates in teens rising, you may wonder how your teens weight compares to normal weight ranges. The growth charts serve as a tool to provide an idea of average weights for teen boys and girls, but remember that these charts may not fit your childs exact needs. Average height to weight ratio chart by age for kids and teenage girls and boys in inches - pounds and centimeters - kilograms. Every baby, child, and teenager is different in the way they mature and grow during their teen years. The average height and weight for a teen girl will depend on several factors and its not uncommon for different countries and cultures to have significant differences. Like teen boys, knowing the average height and weight can provide some useful information, but shouldnt be used as a diagnostic tool. because weight gain is more complicated during our teens, doctors dont rely on weight alone to figure out if someone is in a healthy weight range. Bmi helps doctors estimate how much body fat a person has based on his or her weight and height. Basically the bmi chart shows average height and weight based on set standards, so a few pounds or few inches here or there is not a major cause of worry. According to the bmi chart, the following should be average height and weight of a teenager boys of 12 to 13 years should be 85 to 100 lbs in weight and 58 to 62 inches in height. If youre in the healthy weight range, youre a healthy weight for your height. Its still important to eat a balanced diet and include physical activity in your daily life to stay in good health. Hi alia, the ideal weight for teenagers are 104 to 110 for a thirteen year old. I have attached a bmi body-mass-index chart for reference purposes. discover the average weight for women in the united states and how they compare to others worldwide. Learn about body mass index (bmi) and how it differs for children and adults. The following table shows the average sizes, weights and bmi from 131 countries. All figures refer to men and women between the ages of 18 and 40 years. The average us-american woman reaches 13 cm less with a height of 1.