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# What is the average height and weight of a 9-year-old boy?

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### Quick Answer

The average height and weight of a 9-year-old boy in the United States is 52.5 inches and 63 pounds, according to MDHealth. It is important to remember that this average can be affected by many things, such as growth spurts that cause children to gain and lose weight rapidly. Height and weight can also be considered using a BMI calculator or chart.

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### Full Answer

According to the CDC, height and weight in relation to BMI is calculated differently for children than for adults, and it changes with age. Healthy weight range charts cannot be provided by the CDC for children because children's weight changes in relation to growth in height. What is considered a healthy weight also changes for children each month. The CDC also suggests that BMI does not directly measure body fat but is simply a tool used to compare the height and weight of children who are the same sex and age.

WebMD provides a tool that people can use to predict a child's height upon reaching adulthood that is based on the height of both parents. Talking to a pediatric physician is best if there are any concerns about height or weight. There are also multiple BMI calculators online that can be used for children.

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According to the Centers for Disease Control, the CDC, the average weight for a 12-year-old boy is 90 pounds. At this age, boys in the top 10 percent weigh about 120 pounds or more while those in the lower 10 percent weigh about 70 pounds or less.

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To use a height and weight chart, find your height in the left-hand column of the chart, according to Rush University Medical Center. Moving to the right in the same row, find your weight. The heading at the top of the chart identifies your weight class: normal, overweight or obese.

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