1/2 inch thick by 42 inches high by 72 inches wide.
The official backboard in the NBA measures 3.5 feet high and 6 feet wide. Usually, it is made from tempered glass or fiberglass. Somewhere at the middle part of the backboard is a rectangle, which is used primarily for making bank shots. It measures 1.5 feet high and 2 feet wide. The linesconstituting the rectangle must have a width of 2 inches. Connected to the backboard is the rim, where the players must shoot the ball inside in order to score. This important part must have an 18-inch diameter. In terms of height, it must be positioned exactly 10 feet above the ground.
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13" x 13" As far as the NBA goes, Rule 1, Section B, Article 2 states:
"A transparent backboard shall be marked with a 2" white rectangle centered behind the ring. This rectangle shall have outside dimensions of 24" horizontally and 18" vertically."
It's a rectangle NOT a square, with 2" thick line. This rectangle which is centered behind the ring shall have outside dimensions of 24" horizontally and 18" vertically.