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Average ht/wt: Average height and weight for a 9 year old by looking at a growth chart would be around 54inches and 62 lbs.But you have to be cautious about these numbers as people's body builds vary and weight may be lighter or heavier. Ideally, one should look at the bmi....Read more.hat is the average weight and height for 9 year old boy? 1. Average ht/wt: Average height and weight for a 9 year old by looking at a growth chart would be around 54inches and 62 lbs. But you have to be cautious about these numbers as people's body builds vary and weight may be lighter or heavier.
To arrive at this number, divide weight in pounds by height in inches and then divide this number by height in inches again. From there, multiply this number by 703 to arrive at your childâs BMI. An 8-year-old boy weighing 50 lbs. at a height of 4 feet 1 inch tall has a BMI of 14.6.This number is then placed on a growth chart to arrive at a percentile.n 8-year-old boy weighing 50 lbs. at a height of 4 feet 1 inch tall has a BMI of 14.6. This number is then placed on a growth chart to arrive at a percentile.