Pro (NBA), College, High School and Junior High School courts differ on overall size and layout, but the interior markings for the “Foul Line”, and “The Backboard and Rim” are the same measurements. The NBA court has a unique 3 point line (arc).
Court Size Overall:
The Professional NBA and (WNBA) Court is 94 feet long and 50 feet wide
Note: WNBA Basketball Court Dimensions are the same in every respect as the NBA
The Foul Line:
For all courts including the NBA, the “foul line” distance is 15 feet from the foul line to the front of the backboard. The “foul line” is 18 feet 10 inches from the baseline.
“The key” (sometimes called “the lane”) for an NBA/Professional court is 16 feet wide.
Regulation courts have the backboard extending out 4 feet over the baseline into the key. A 6 foot arc (half circle) extends from the foul line away from the basket to complete the key.
The 3 Point Line (Arc):
NBA – the 3 point arc is 22 feet to the center of the rim on the sides with a straight line extending out 16 feet 9 inches from the baseline. Past those points the line extends out 23 feet 9 inches from the center of the rim.
The Backboard and Rim:
The regulation distance from the ground to the top of the rim is 10 feet for all levels of play. Regulation backboards are 6 feet wide (72 inches) by 42 inches tall. All basketball rims (hoops) are 18 inches in diameter. The inner square on the backboard is 24 inches wide by 18 inches tall.
All line markings on the floor are 2 inches wide and can vary in color.
The Restricted Arc
The restricted area arc is a semi-circular arc drawn around the area directly underneath the basket. Defensive players whose feet are inside this arc cannot draw charging fouls. The restricted arc in NBA and WNBA competition has a radius of 4 feet (1.22 m) from the center of the basket.