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How big is a regulation size basketball backboard?

So, how big is a regulation-sized basketball backboard?

The dimension requirements listed by the NBA, NCAA and High School are all the same. The regulation size for a basketball backboard is 42" tall x 72" wide. However, a 48" tall backboard is also permissible.

What about lower levels of competition?

The rules governing the size of a backboard are not as stringent at the high school level. Variable dimensions are permitted if they are approved by the local governing body.

The regulation backboard is marked with a white rectangle 2 inches wide that is centered behind the ring; the outer dimensions of the rectangle are 24 inches wide by 18 inches high. The basket itself consists of a metal ring with an 18-inch inner diameter and a white cord net that is 15 to 18 inches long.

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