Basketball Court Layout: Dimensions, Markings, and Diagrams Explained

A basketball court layout consists of a rectangular playing surface divided by boundary lines, zone markings, and arcs that govern how the game is played. The overall size changes depending on the level of play — but the hoop height (10′) and foul line distance (15′) stay the same across all formats.

What Is a Standard Basketball Court Layout?

At its most basic, a basketball court is a rectangle with lines marking boundaries, zones, and shooting distances. The exact dimensions shift depending on whether you're looking at a professional NBA floor, an international FIBA court, a college gym, or a high school setup.

What doesn't change: the hoop sits 10 feet above the floor at every level. The free throw line is always 15 feet from the front face of the backboard. Those two measurements are fixed regardless of the governing body.

Here's a quick-reference overview before we get into the details:

Basketball Court Dimensions by Level of Play

The numbers matter more than most people realise — especially if you're planning an installation or coaching across different age groups. A high school player stepping onto an NBA floor for the first time is dealing with 10 extra feet of court length and a 3-point line that sits nearly 4 feet further back. That's a significant adjustment.

NBA Court Dimensions

The NBA plays on a 94′ × 50′ court. The key (also called the paint) is 16 feet wide. The 3-point arc sits 23′9″ from the centre of the basket at its furthest point, but drops to 22 feet in the corners where the arc runs parallel to the sidelines.

The restricted area — a 4-foot semi-circle directly under the basket — is a marking that prevents defenders from drawing charging fouls when positioned too close to the hoop.

According to the NBA Official Rulebook, this restricted area is drawn as a half-circle 4 feet from the centre of the basket ring, running parallel to the lane line to the face of the backboard. The backboard measures 6′ wide by 3.5′ tall, with an inner rectangle of 24″ × 18″ centred behind the ring. The ring itself has an inside diameter of 18 inches.

WNBA Court Dimensions

The WNBA uses the same 94′ × 50′ court as the NBA. The main difference is the 3-point line, which ranges from 20′6″ at the corners to 22′1.75″ at the top of the arc — noticeably shorter than the NBA arc.

NCAA (College) Court Dimensions

College courts match the NBA in overall size — 94′ × 50′ — but the key is narrower at 12 feet, and the 3-point line sits at 22′1.75″ uniformly. In practice, players transitioning from college to the NBA frequently cite the deeper 3-point line as one of the first major adjustments they face.

FIBA (International) Court Dimensions

FIBA courts measure 28 metres × 15 metres, which translates to roughly 92′ × 49′ — slightly smaller than NBA/NCAA. The 3-point arc distance is approximately the same as NCAA at 6.75 metres (~22′1.75″).

What's actually distinct about FIBA is the key shape. While NBA and NCAA use a rectangular key, as noted in Wikipedia's overview of the basketball court, FIBA uses a trapezoidal key — wider at the baseline than at the free throw line. It produces a noticeably different lane shape on international courts, with the baseline width sitting at approximately 19.7 feet and narrowing to 12 feet at the free throw line.

High School Court Dimensions

High school courts are 84′ × 50′ — 10 feet shorter than NBA/NCAA. The key is 12 feet wide, and the 3-point arc is 19′9″. This shorter court is deliberate; it keeps the game manageable for developing players without fundamentally changing how it's played.

Jr. High School Court Dimensions

Jr. High courts are the smallest standard format at 74′ × 42′. The 3-point line is not universally standardised at this level — some leagues use it, many don't. If you're marking a Jr. High court, check with the relevant state or regional federation before adding a 3-point arc.

Basketball Court Markings and What Each One Means

Most diagrams show you where the lines are. Fewer explain what they actually govern. Here's what each marking does in practice.

Baseline and Sidelines

The baseline runs the width of the court behind each basket. The sidelines run the full length. Together, they form the outer boundary — any ball or player touching or crossing these lines is out of bounds. Simple, but everything else on the court is measured relative to these edges.

Centre Line (Division Line)

The centre line splits the court into two equal halves. Once a team brings the ball past this line into their frontcourt, they cannot legally pass or dribble it back across — doing so is a backcourt violation. The 10-second rule in NBA (8 seconds in FIBA) also starts from the moment a team gains possession in their backcourt.

The Key (Free Throw Lane / The Paint)

The key — more commonly called the paint — is the rectangular zone stretching from the baseline to the free throw line. It's 12 feet wide at high school and college level, 16 feet wide in the NBA and FIBA (though FIBA's version is trapezoidal, as noted above).

Offensive players cannot stand in the key for more than three consecutive seconds while their team has possession. This is the three-second violation, and the key's boundaries define exactly where it applies. Interestingly, the lane width difference between NCAA and NBA is one of the more meaningful tactical changes between those two levels — the wider NBA key pushes post players further from the basket.

The Free Throw Line and Circle

The free throw line is 15 feet from the front face of the backboard — at every level, without exception. This is the one measurement that genuinely never changes. A 6-foot radius circle is centred on the free throw line; players must line up along this circle's edges during free throw attempts, and the shooter must stay behind the line until the ball hits the rim.

The 3-Point Arc

The 3-point line is where the basketball court dimensions diverge most noticeably between levels. A shot landing beyond this arc counts for three points; inside it, two. The corner 3 is worth noting specifically in NBA play — because the arc runs parallel to the sidelines at 22 feet before curving out to 23′9″, a corner 3 is physically shorter than a top-of-the-arc 3. Teams have increasingly exploited this over the past decade.

The Restricted Area Arc

This 4-foot semi-circle sits directly under the basket and exists specifically to reduce collisions near the hoop. If a defender is standing inside the restricted area when a charging foul is called, it is ruled a defensive foul rather than an offensive charge. What's often overlooked is that this rule exists primarily to discourage defenders from stationing themselves under the basket purely to draw fouls.

Hash Marks and Lane Markers

Inside the key, small lane space marks indicate where players must stand during free throws. These aren't decorative — referees use them to position players and enforce spacing rules.

The lower defensive box hash marks sit just inside the key near the baseline, aligned with the edge of the free throw circle.

They mark the top boundary of the lower defensive box — a zone referenced in NBA rules to determine eligibility for certain foul classifications. These marks are among the least-explained features on a court diagram, but they do serve a specific officiating purpose.

Along the sidelines, hash marks 28 feet from the baseline designate the substitution box area, where players wait before entering the game.

Centre Circle

The centre circle has a 6-foot radius and sits at the exact midpoint of the court. It's used for the opening tip-off at the start of the game. Identical circles are drawn at each end of the court, centred on the free throw lines — these frame the free throw area and help with player positioning.

Half-Court Layout

A half-court setup uses one basket and one end of the full court. Standard half court dimensions are 47′ × 50′ — exactly half the NBA full court length. In recreational and backyard settings, half-court is the default simply because of space constraints.

The markings that carry over include the key, the free throw line and circle, the 3-point arc, and the baseline. The centre line and centre circle are typically omitted in a pure half-court setup, though some recreational courts retain a mid-court reference line for game organisation.

For a functional backyard half-court, a minimum slab of approximately 30′ × 25′ is workable for casual play, though 47′ × 25′ gives a more realistic shooting experience. Teams commonly find that anything narrower than 20 feet in width significantly limits the usable playing area, particularly around the 3-point arc.

Equipment Dimensions Connected to Court Layout

Backboard and Ring Specifications

The backboard is 6 feet wide and 3.5 feet tall, with a flat, transparent front surface. An inner rectangle measuring 24 inches wide by 18 inches tall is centred behind the ring — this is the target box players aim for on bank shots.

The ring has an inside diameter of 18 inches. The top of the ring sits exactly 10 feet above the playing surface. For sanctioned play, the front face of the backboard should sit 4 feet from the baseline. In residential installations, getting as close to this 4-foot dimension as the space allows is the standard recommendation.

Court Surface Types

Indoor courts at the professional and collegiate level use hardwood — typically maple. Line markings are painted and sealed into the floor surface.

Outdoor and recreational courts use asphalt, concrete, or interlocking modular tile. On these surfaces, court lines are either painted directly or applied as adhesive tape or stencils. Modular tile courts have become increasingly common in backyard installations because they don't require a freshly poured slab and allow for easier line marking.

Conclusion

The basketball court layout varies by level — overall size, key width, and 3-point distance all shift depending on the governing body. What stays fixed is hoop height and foul line distance. For anyone planning a court, the baseline-to-backboard clearance matters as much as the lines themselves.

Frequently Asked Questions

Q1: What is the size of a standard basketball court?

NBA and NCAA courts measure 94′ × 50′. High school courts are 84′ × 50′, and Jr. High courts are 74′ × 42′. FIBA courts are slightly smaller at approximately 92′ × 49′. Hoop height is 10 feet at all levels.

Q2: What is the paint or key in basketball?

The key — also called the paint — is the rectangular zone between the baseline and the free throw line. It's 12 feet wide in high school and NCAA play, 16 feet wide in the NBA. Offensive players cannot stand in it for more than three consecutive seconds.

Q3: How far is the 3-point line from the basket?

It varies by level. NBA: 23′9″ (22′ in corners). NCAA and FIBA: 22′1.75″. High school: 19′9″. WNBA: 20′6″ to 22′1.75″. The NBA has the longest 3-point distance of any format.

Q4: What is the FIBA trapezoidal key?

Unlike the rectangular key used in NBA and NCAA, FIBA's key is trapezoidal — wider at the baseline (19.7 feet) and narrower at the free throw line (12 feet). It produces a noticeably different lane shape on international courts.

Q5: What space do I need for a backyard half-court?

A slab of at least 30′ × 25′ allows for casual half-court play. A 47′ × 25′ space accommodates a more regulation-accurate setup. Anything narrower than 20 feet makes the court difficult to use practically.