The backboard shall be a rectangle measuring 6' horizontally and 3 1/2' vertically. The front surface shall be flat and transparent.
www.Basketball.com/nba/rules/rule1.shtml
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Size of a basketball backboard
Width: 6 feet (72 inches)
Height: 3.5 feet (42 inches)
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NBA/NCAA court dimensions: 94 feet long, 50 feet wide.
High school court dimensions: 84 feet long, 50 feet wide.
Jr. High dimensions: 74 feet long, 42 feet wide.
The official size of an NBA blackboard is 72" wide, by 42" in height. The inner square on the backboard is 24" wide x 18" in height.