Basketball Court Outline: Every Line, Dimension, and Marking Explained

A basketball court outline refers to the full set of boundary lines and interior markings painted on a regulation basketball court. It defines the playing area, separates zones for gameplay rules, and varies in specific measurements depending on the level of play — NBA, FIBA, NCAA, high school, or junior high.

Full Court vs. Half Court Outline

Not every outline is the same format. There are two common versions.

A full court outline covers the entire playing surface — both baskets, both free throw lanes, the center circle, and every marking in between. This is the standard reference for understanding regulation play and for marking a new court.

A half court outline shows only one basket end: one lane, one three-point arc, and the midcourt line acting as the far boundary. Coaches use half court outlines constantly — for drawing plays, running drills, and scouting opponents. In practice, most coaching diagram sets include far more half court sheets than full court ones, simply because most tactical work happens in one half.

Which one do you need?

Basketball Court Outline Dimensions by Level of Play

This is where most confusion happens. The outline is not identical across levels. Overall court size, key width, and three-point distance all shift depending on the governing body.

As documented by Wikipedia's Basketball Court reference, the NBA court measures 94 ft by 50 ft while FIBA courts are slightly smaller at 28 by 15 meters — a difference that becomes meaningful when marking or building a court to a specific standard.

NBA (Professional)

The NBA court is 94 ft long by 50 ft wide. The paint — also called the key or free throw lane — is 16 ft wide. The three-point line sits at 22 ft from the basket center at the corners, extending out to 23 ft 9 in at the top of the arc. The free throw line is 15 ft from the face of the backboard at every level.

FIBA (International)

FIBA courts measure 28 meters by 15 meters, which converts to approximately 92 ft by 49 ft. The key is 16 ft wide, matching NBA width. The three-point arc ranges from 21.65 ft to 22.15 ft from the basket center.

NCAA (College)

College courts share the NBA's 94 × 50 ft overall size, but the key narrows to 12 ft wide. The three-point line sits at 22 ft 1.75 in — slightly farther than the NBA corner distance but shorter than the NBA top-of-arc distance.

High School

High school courts are smaller: 84 ft by 50 ft. The key is 12 ft wide. The three-point line sits at 19.75 ft — noticeably shorter than college or pro distances.

Junior High

Junior high courts are typically 74 ft by 42 ft, though this varies by state and school. The key is 12 ft wide. Most junior high levels do not use a standardized three-point line, though some adopt the high school distance.

Dimensions Comparison Table

What's often overlooked is that the free throw line distance — 15 ft from the face of the backboard — stays the same across every level. That's one of the few constants in the entire outline.

Every Marking on a Basketball Court Outline — Named and Explained

Most diagrams show the lines. Fewer explain what those lines actually do. Here's each one.

Boundary Lines — Sidelines and Baselines

The sidelines run the length of the court. The baselines (also called end lines) run the width at each end. Together they form the outer rectangle of the basketball court outline.

One thing many people get wrong: the boundary lines themselves are considered in-bounds. Per NBA rules, a player is only out-of-bounds when they touch the floor on or outside the line — not when they're on the line itself. All painted boundary lines are 2 inches wide.

The Paint — Free Throw Lane

The rectangular zone extending from each baseline to the free throw line is called the paint, the key, or the free throw lane. The color fill is where the nickname "the paint" comes from — it's typically a solid color distinct from the rest of the court.

Width is the key variable here: 16 ft at NBA and FIBA level, 12 ft at NCAA and below. Players in the paint during a free throw must wait for the ball to hit the rim before moving.

Inside the lane, there are small lane space marks — 2-inch by 6-inch rectangles — along the lane lines. These mark where players stand during free throws. Neutral zone marks sit adjacent to them. Neither the lane space marks nor neutral zone marks count as part of the lane boundary itself.

Free Throw Line and Free Throw Circle

The free throw line is a 2-inch wide line drawn parallel to the baseline, 15 ft from the face of the backboard. Centered on this line is a circle with a 6 ft radius — the free throw circle. The top half of this circle is usually painted as a solid arc; the bottom half is typically a dashed arc inside the paint.

Three-Point Line

The three-point line is not a complete circle. That's a common misconception. It has two straight segments running parallel to the sidelines — at 3 ft from the sideline in the NBA — which then connect to a curved arc measured from the center of the basket.

At the NBA level: the straight sideline segments extend from the baseline, and the arc kicks in at 22 ft from the basket center, reaching 23 ft 9 in at the top. The arc distance varies by level; the sideline segment distance also varies.

Center Circle and Division Line

The center circle has a 6 ft radius and sits at the exact midpoint of the court. Jump balls at the start of each game happen here. The division line — also called the midcourt line or half-court line — runs through the center of the circle from sideline to sideline. It defines the backcourt boundary: once a team crosses into the frontcourt, they cannot return to the backcourt without a violation.

Restricted Area Arc

This is the marking most casually observed but least understood. The restricted area is a semicircle with a 4 ft radius drawn from the center of the basket, connected by straight lines parallel to the lane line up to the face of the backboard. It's painted as a solid 2-inch arc.

Its function is specific: according to the Wikipedia Glossary of Basketball Terms, contact fouls involving a driving offensive player and a stationary defender inside this zone are called as a blocking foul on the defender — meaning a defender planted here cannot draw a charging call. In practice, referees use this arc to make some of the most contested foul calls in the game.

Hash Marks — Sideline, Baseline, and Free Throw Area

Hash marks are the short line segments scattered around the court outline that don't form named zones but serve specific positioning purposes.

• Sideline hash marks: Drawn 28 ft from the baseline, extending 3 ft onto the court. These mark the boundary of the lower defensive box area and are used as reference points for certain out-of-bounds plays.
• Baseline hash marks: Positioned 3 ft from the free throw lane line, extending 6 inches onto the court. These help define player positioning near the lane on baseline plays.
• Free throw circle hash marks: Drawn 13 ft from the baseline, 3 ft from the lane lines, and 6 inches in length. These appear on each side of the free throw circle.

Substitution Box

Two hash marks drawn perpendicular to the sideline — each 4 ft on either side of the midcourt line — mark the substitution box. This is where players wait before checking into the game. It sits directly in front of the scorer's table, which is why you'll always see that area clearly marked at regulation venues.

Backboard and Basket — Official Specs That Complete the Outline

The court outline technically extends to the equipment. These dimensions matter for construction and layout planning.

• Backboard: 6 ft wide, 3.5 ft tall, flat and transparent
• Inner rectangle on backboard: 24 in wide by 18 in tall, marked with a 2-inch border — this is the target box players aim above when shooting off the glass
• Basket ring: 18 in inside diameter, painted orange
• Rim height: 10 ft above the floor at all levels
• Net length: 18 inches

The rim height of 10 ft is another universal constant — it does not change across NBA, FIBA, NCAA, high school, or junior high play.

Common Misconceptions About Basketball Court Markings

A few things that come up repeatedly when people read court outlines.

"The key is the same size everywhere." It is not. The NBA and FIBA use a 16 ft wide key. NCAA, high school, and junior high use 12 ft. That 4 ft difference meaningfully changes spacing in the post.

"The three-point line is a complete arc." It has straight sideline segments near the corners. The arc portion only begins at a certain point from the baseline. The corner three-point shot is shorter than the top-of-the-key shot at NBA level specifically because of this geometry.

"Boundary lines are out-of-bounds." The line itself is in-bounds. A player is only out when they contact the floor beyond the line.

"The center circle is just for jump balls." It also serves as a visual reference for backcourt positioning and is used in determining certain rule calls during live play.

Conclusion

A basketball court outline covers more than just the outer rectangle. From lane markings and hash marks to the restricted area arc and substitution box, each line has a specific rule attached to it. Dimensions shift across levels — particularly key width and three-point distance — but the free throw line distance and rim height stay constant. Knowing what each line means makes both reading diagrams and understanding gameplay considerably clearer.

Frequently Asked Questions

Are NBA and NCAA basketball court outlines the same size?

The overall court dimensions are the same — 94 × 50 ft — but the key width differs. NBA uses a 16 ft wide paint; NCAA uses 12 ft. The three-point line distance also differs between the two levels.

What is the restricted area on a basketball court outline?

It's a 4 ft semicircle arc directly under the basket. Defenders standing inside it cannot draw a charging foul. It affects how referees call contact plays near the basket.

How wide are the lines on a standard basketball court outline?

Most painted lines on a regulation court are 2 inches wide. This applies to boundary lines, the free throw line, hash marks, and the restricted area arc.

What is the difference between a full court and half court outline?

A full court outline shows both ends of the court. A half court outline shows one basket end only, with the midcourt line as the far boundary. Coaches typically use half court diagrams for play design.

Is the three-point line a complete arc on a basketball court outline?

No. It has two straight segments running parallel to the sidelines near the corners, which then connect to a curved arc. The corner three-point shot is shorter than the top-of-the-arc shot at the NBA level as a result.