What is the average height for a 15 year old boy

6 foot
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The average height for a fifteen year old boy in USA is 66 1/2 inches (50th percentile). The 95th% height is 71 1/2 inches; the 3rd percentile height is 61 inches.

The average weight of a fifteen year old boy in USA is 125 pounds (50th percentile). The 95th percentile weight is 174 1/2 pounds; the 3rd percentile weight is 95 pounds.

Remember that one should consider the mid-parent height to have a meaningful interpretation of height of children. If both parents r below average height for an adult, the child will have a proportional stature in relation to parents.

One would need height & weight to calculate BMI. Underweight BM l is less than 18.5
Normal is between 18.5 to 24.9; Overweight BM l is 25-29.9; obesity BM l is 30 & greater.