The size of a high school Basketball hoop is 18 inches across on the inside. The hoop or ring as it is called is made from 5/8 inch high tensile steel. The entire assembly, which includes a safety feature, in mounted so the top of the ring is 10 feet above the playing surface below.
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The diameter of the rim of a basketball hoop is about 18 inches across in every way and it has an area of 254.469 inches^2.
A basketball goal, or hoop, is about 56½ inches in circumference (56.55 inches). The rim is 18 inches in central diameter, and the top of the rim should be exactly 10 feet off the ground.