The official regulation is 10' from the top of the rim to the floor in High School, College, and the Pros. In elementary school it is sometimes set to a lower level for these younger players but there is no official rule on this and it is left up to the administrators at that school.
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The height of a college rim is the same as a professional rim or high school rim: 10 feet to the rim. The only thing that will vary is the height of the top of the back board. ---Tom