Basketball Court Dimensions: NBA, NCAA, High School & FIBA Measurements

Basketball court dimensions vary depending on the level of play. An NBA court measures 94 feet long by 50 feet wide. NCAA college courts match that size. High school courts run slightly shorter at 84 × 50 feet. FIBA international courts measure 28 × 15 meters (roughly 91.9 × 49.2 feet). A few key measurements — rim height, free throw distance, and restricted area radius — stay the same across all levels.

Basketball Court Dimensions by Level — Quick Reference

Why Basketball Court Dimensions Differ by Level

The short answer: facility size and player development. Junior high and high school courts are built to fit into school gymnasiums that were never designed around professional sport. Smaller dimensions reduce the physical demand on younger players — shorter sprints, closer shots, less ground to cover.

At the professional and international level, dimensions are set by governing bodies — the NBA, FIBA, NCAA — each with their own rulebooks and historical standards. FIBA uses the metric system, which is why its court dimensions don't convert to round numbers in feet.

As noted on the Wikipedia basketball court overview, many older high school gyms were built at 84 feet or even 74 feet in length, reflecting the physical constraints of the buildings they were housed in rather than any deliberate rules decision.

What's often overlooked is that these aren't arbitrary choices. The three-point line, for example, has been adjusted multiple times as the game evolved. The NCAA moved its men's three-point line from 20 feet 9 inches to 22 feet 1.75 inches starting with the 2019–20 season — primarily to open up driving lanes and reduce congestion around the arc.

NBA Basketball Court Dimensions

Overall Court Size

An NBA regulation basketball court is 94 feet long and 50 feet wide. Worth noting: at least one widely referenced website lists NBA court width as 60 feet — that figure is incorrect. The 50-foot width is confirmed in the NBA's official rulebook under Rule No. 1.

Three-Point Line

The NBA three-point arc sits 23 feet 9 inches from the center of the basket. Along the baseline, two straight parallel lines extend 16 feet 9 inches out from the baseline before the arc begins. These straight sections run 3 feet from each sideline.

The Key (Paint Area)

The NBA key — also called the lane or the paint — is 16 feet wide. It extends from the baseline to the free throw line. The wider key compared to other levels pushes defenders further from the basket, reducing low-post congestion. In practice, coaches at every level treat key width as one of the more tactically significant dimensional differences between leagues.

Free Throw Line and Circle

The free throw line sits 15 feet from the face of the backboard. The line itself is 2 inches wide. A circle with a 6-foot radius is centered on the free throw line, creating the familiar half-circle seen on every court.

Restricted Area Arc

A half-circle arc sits 4 feet from the center of the basket ring. This marking prevents a stationary defender from drawing a charging foul when positioned directly under the basket. It exists at NBA, NCAA, and high school levels — same radius across all three.

Hash Marks and Substitution Box

Four hash marks are drawn perpendicular to each sideline, 28 feet from the baseline, extending 3 feet onto the court. A substitution box is marked 4 feet on each side of the midcourt line. All hash marks and boundary lines are 2 inches wide per NBA specification.

Backboard and Rim Specifications

NCAA College Basketball Court Dimensions

Overall Court Size

NCAA men's and women's college courts are 94 feet long and 50 feet wide — the same footprint as an NBA court. The difference shows up in specific markings, not the overall size.

Three-Point Line

The current NCAA men's three-point line is 22 feet 1.75 inches from the basket center. According to the NCAA Playing Rules Oversight Panel announcement, this change took effect for Division I programs in the 2019–20 season, with the stated goal of making the lane more available for dribble-drive plays and reducing the over-reliance on perimeter shooting. Division II and III programs followed in 2020–21.

If you encounter the older 20'9" figure on another site, it reflects pre-2019 rules — or potentially applies to women's college basketball, which adopted the same 22'1.75" line as of 2021.

The Key and Free Throw Line

The NCAA key is 12 feet wide, compared to the NBA's 16 feet. The free throw line sits 15 feet from the backboard — consistent with every other level of play.

High School Basketball Court Dimensions (NFHS)

High school courts are the most common type most players ever set foot on. The NFHS (National Federation of State High School Associations) sets the standard used across most US states.

Overall Court Size

A regulation high school basketball court is 84 feet long and 50 feet wide — 10 feet shorter than a college or NBA court. The width stays the same, which means the floor feels less like a sprint and more like a controlled game environment for developing players.

Three-Point Line

The high school three-point arc is 19 feet 9 inches from the center of the basket. The straight baseline section extends 63 inches before the arc begins. At roughly 4 feet shorter than the NBA arc, this is intentionally accessible for high school players still developing range.

The Key and Free Throw Line

The key is 12 feet wide, the same as NCAA. The free throw line holds at 15 feet from the backboard — this measurement never changes, regardless of level.

Center Circle and Midcourt Line

The center circle has a 12-foot diameter. The midcourt line bisects the court, creating two equal 42-foot halves. This shorter backcourt compared to the NBA affects how quickly teams must advance the ball past halfcourt.

Junior High Basketball Court Dimensions

Junior high courts are less standardized than any other level. State athletic associations and individual schools often apply their own guidelines, so dimensions can vary more here than anywhere else in organized basketball.

Typical Court Size

Junior high courts are commonly around 74 feet long and 42 feet wide, though this varies. The key is usually 12 feet wide and the free throw line sits at the standard 15 feet from the backboard.

Key Differences from High School

The shorter length and narrower width reduce the physical demand on younger athletes. Three-point lines at this level, where used, typically match the high school distance (19'9"), but some junior programs play without a three-point line entirely.

WNBA Basketball Court Dimensions

WNBA courts use the same 94 × 50-foot footprint as the NBA. The main dimensional difference is the three-point arc: the WNBA line sits at 22 feet 1.75 inches, aligning with the FIBA and NCAA standard rather than the longer NBA arc of 23'9".

FIBA International Basketball Court Dimensions

Overall Court Size

FIBA courts measure 28 meters long by 15 meters wide — that converts to approximately 91.9 × 49.2 feet. The metric-based system means FIBA dimensions don't produce round numbers in imperial, which causes occasional confusion when comparing with NBA specs.

Three-Point Line and Key

The FIBA three-point line is 6.75 meters (22 feet 1.75 inches) from the basket center — matching the WNBA and current NCAA line. The key is 16 feet wide, same as the NBA, which distinguishes FIBA from NCAA and high school courts on this particular measurement.

Dimensions That Stay the Same on Every Basketball Court

Interestingly, several measurements are fixed regardless of level. These constants reflect fundamental aspects of the game that don't scale with court size.

Half-Court Basketball Dimensions by Level

A half-court is simply half the full court length. In casual and recreational settings, half-court games are far more common than full-court play.

In practice, most backyard half-courts are built around a simplified version of the high school half-court — 42 × 50 feet where space allows, or scaled down further.

Basketball Court Dimensions for Backyard and Recreational Use

Planning a backyard court means working backwards from the regulation dimensions and adjusting for real-world space.

Minimum Space for a Half-Court

A functional backyard half-court typically requires a minimum slab of 30 × 25 feet for casual play. For a more complete half-court experience with a three-point line, most installers recommend a 45 × 30-foot surface. This accounts for out-of-bounds clearance of at least 3 feet on each side.

Full Court Backyard Considerations

A full regulation high school court (84 × 50 ft) plus out-of-bounds clearance requires roughly 90 × 55 feet of usable flat space — more than most residential lots can accommodate. Full backyard courts are typically built at 60–75% of regulation size.

Ceiling Height for Indoor Courts

For indoor gymnasium installations, the NFHS recommends a minimum ceiling height of 24 feet. Residential indoor courts often fall short of this, which affects shot arc on high-trajectory shots near the baseline.

Conclusion

Basketball court dimensions follow a clear pattern — courts get longer and three-point lines get further as the level of play increases. A few measurements stay fixed at every level. Knowing these numbers helps whether you're building a court, coaching, or just settling a debate.

Frequently Asked Questions

What are the official NBA basketball court dimensions?

An NBA court is 94 feet long and 50 feet wide. The three-point arc is 23 feet 9 inches from the basket. The key is 16 feet wide and the rim sits 10 feet off the floor.

How does a high school court differ from an NBA court?

High school courts are 84 × 50 feet — 10 feet shorter than the NBA's 94 × 50. The three-point line is also closer: 19'9" in high school versus 23'9" in the NBA. The key is narrower too: 12 feet versus 16 feet.

What is the standard three-point line distance at each level?

NBA: 23'9". WNBA and FIBA: 22'1.75". NCAA (post-2019): 22'1.75". High school and junior high: 19'9".

What dimensions stay the same on every basketball court?

Rim height (10 ft), free throw line distance (15 ft from backboard), restricted area arc radius (4 ft), and rim inside diameter (18 in) are consistent across all levels of play.

What size space do I need for a backyard basketball court?

A half-court with three-point line needs roughly 45 × 30 feet of flat surface. Add at least 3 feet of clearance on all sides. A full regulation court needs closer to 90 × 55 feet including run-off space.