How Tall Is an NBA Rim? NBA Hoop Height and Rim Sizes Explained

The height of NBA rims is set in Rule 1, Section II of the rulebook, the section on equipment. It says each basket ring must be securely attached to the backboard with its upper edge 10 feet above and parallel to the floor, and equidistant from the vertical edges of the board. NBA rim height is the same at both ends of the court. The measurement is taken to the top of the ring, which is the part players see and touch, not to the bottom of the net or to the centre of the opening.

How tall is an NBA rim in other units? Ten feet is 120 inches, or 3.048 metres. The height applies to both baskets at either end of the court. There is no separate rule for the home team and the visitors, and there is no adjustment for height or for the level of a game: the NBA describes one basket, and every arena uses it.

The nearest point of the inside edge of the ring sits 6 inches from the face of the board, so the ring hangs out into the court by that distance. The rulebook also says the ring is painted orange. The rulebook calls it a pressure-release, NBA approved metal safety ring.

The rim is only one part of the basket, and the rulebook gives a size for each part. The ring has an inside diameter of 18 inches. The net is a white cord net 18 inches long, built from cord that is not less than 30 thread and not more than 120 thread, and it is constructed to check the ball momentarily as it passes through the basket.

The backboard is a rectangle measuring 6 feet horizontally and 3½ feet vertically, which is 72 inches by 42 inches. Its front surface is flat and transparent. A transparent backboard carries a white rectangle, 2 inches wide, centred behind the ring, with outside dimensions of 24 inches horizontally and 18 inches vertically. Every NBA arena backboard also has four strips of red LED lights, synchronized with the game clock and running around the inside of the four sides, to indicate the expiration of time, and one strip of amber LED light to indicate the expiration of the shot clock.

How tall is an NBA rim compared with the court around it? The NBA rim height of 10 feet is about one-tenth of the 94-foot length, and the NBA hoop height is the one number every other basket measurement hangs from.

The rim hangs at the end of a court that is 94 feet long and 50 feet wide, measured inside the boundary lines. The free throw line is 15 feet from the plane of the face of the backboard, and the three-point area is bounded by parallel lines 3 feet from the sidelines and an arc of 23 feet, 9 inches from the middle of the basket.

Those distances are all measured from the same point, the basket. The restricted area under the basket is marked with a half-circle 4 feet from the centre of the basket ring, then continues parallel to the lane line to the face of the backboard. Every one of these markings is measured from the basket.

A court's dimensions and the rim height do not change from one game to the next. Officials inspect and approve the court, baskets, balls and backboards before the start of every game, and the rulebook requires the home team to have a spare board with a supporting unit on hand for emergencies, plus a steel tape or extension ruler and a level, to check the equipment if necessary. The rulebook therefore expects the height of a rim to be checkable with a tape and a level.

The height of the rim matters most in Rule 11, which lists what a player may not do around the basket. A player may not touch the ball or the ring while the ball is sitting or rolling on the ring, or hang on the rim while the ball is passing through. A player may not touch a ball from within the playing area when it is above the ring and within the imaginary cylinder over the basket, and may not touch a ball that has a chance to score after it has touched any part of the backboard above ring level, on its way up or down. Touching a ball on its downward flight with an opportunity to score counts as a field goal attempt for this purpose.

Other limits protect the net and the ring. A player may not trap the ball against the face of the backboard, may not touch the ball with a hand that is through the basket ring, may not vibrate the rim, net or backboard so as to cause an unnatural bounce, and may not touch the rim, net or ball while the ball is in the net and prevent it from clearing the basket.

The penalty depends on where the violation happens. At the opponent's basket the offended team is awarded two points for an attempt from the two-point zone and three points from the three-point zone. At a team's own basket no points can be scored and the ball goes to the offended team at the free throw line extended. If both teams commit a violation, no points can be scored and play resumes with a jump ball at the center circle.

The 10-foot height is older than the NBA. When James Naismith invented basketball in 1891, the first baskets were fixed to a rail in the Springfield gymnasium, about 10 feet above the floor, according to Britannica's history of the game. The baskets in those first games were peach baskets, and when iron hoops replaced them the goal stayed at 10 feet, so the height has not changed with the equipment.

The league that became the NBA was founded in New York in 1946 and uses the same height. The rulebook does not explain why. It only states the number, which makes 10 feet a convention that the game inherited, not a figure chosen for the modern league.

The rulebook has several rules about the basket, and they depend on the height and the position of the ring. A player may not touch the ball or the ring when the ball is sitting or rolling on the ring, or hang on the rim while the ball is passing through. Rule 11, on basket interference and goaltending, also limits when a player may touch a ball that is above the ring.

Contact with the ring itself is also regulated. An offensive player who deliberately hangs on the ring, net or backboard is assessed a technical foul, and so is a defensive player who deliberately gains or maintains height by hanging on the opponent's ring. There is an exception: a player may hang on the ring or backboard to prevent an injury to himself or another player, with no technical foul assessed.

A player whose contact with the ring or backboard causes the backboard to shatter, or makes the ring unplayable, is penalized with a technical foul during the game, and not during warm-ups. Under no circumstances will that player be ejected for it, and the Commissioner reviews all the actions and plays involved. The rulebook also forbids equipment that is unnatural and designed to increase a player's height or reach, which keeps the effective height of the rim the same for everyone.

All the measurements on this page come from the official 2025-26 NBA playing rules, Rule 1 for the court and equipment, Rule 4 for the definitions, Rule 11 for basket interference and goaltending, Rule 12 for technical fouls such as hanging on the rim, and the comments on the rules for the backboard penalty. Conversions into metres and centimetres are calculated from the figures in feet and inches. The NBA's own overview page also describes rims hanging 10 feet from the floor on a court 50 feet wide and 94 feet long, and the official page for Rule No. 1 lists the ring height, the ring diameter and the three-point arc. The history of the 10-foot height comes from Britannica.

The figures are current as of October 2026 and will be checked again when a new edition of the rulebook is published. More basketball pages are collected on the NBA hub, and the page about basketball air pressure covers the ball itself.