Basketball Court Dimensions
Official basketball court dimensions for four levels of play — High School (NFHS), NCAA, NBA, and FIBA International. Each PDF is a single-page reference with the current rule values, including post-2010 FIBA changes (rectangular key, 6.75 m arc) and the post-2019 NCAA three-point line at 22-ft 1¾-in.
Four regulation courts.
Each PDF is a single-page dimension sheet with the current rule values. Print one and pin it to the coaching-office wall, or use as a reference when marking a driveway or gym.
Marking & FAQ — Basketball Courts
All four levels share a 50-ft width; the differences are court length and the three-point line. High school (NFHS) plays on an 84 ft × 50 ft floor; NCAA and the NBA use 94 ft × 50 ft; FIBA International is metric at 28 m × 15 m (about 91.9 × 49.2 ft).
The three-point arc is where the levels diverge most: 19 ft 9 in. at high school, 22 ft 1¾ in. at NCAA (men since 2019-20, women since 2021-22), and 23 ft 9 in. at the NBA (shrinking to 22 ft in the corners). The NBA also uses a wider 16-ft lane vs. 12 ft elsewhere, and FIBA switched to a rectangular key with a 6.75 m arc in 2010.
How to mark a basketball three-point line
The arc is a portion of a circle centered on the basket, joined to two straight corner segments. Marking it by hand is a string-and-tape job once you know the radius for your level.
You'll need: 100-ft tape measure · Chalk line or marking paint · String the length of the arc radius · A helper to hold the pivot
- Find the basket center. Drop a plumb line from the center of the rim to the floor. That point is the pivot for the arc, 5 ft 3 in. from the baseline.
- Set the radius. Pin a string at the pivot. Length equals your level's arc radius: 19 ft 9 in. (NFHS), 22 ft 1¾ in. (NCAA), 23 ft 9 in. (NBA), or 6.75 m (FIBA).
- Swing the arc. Keeping the string taut, sweep the marker from one side to the other. Stop where the arc reaches the corner-line distance.
- Add the straight corners. From where the arc ends, run a straight line parallel to the sideline back to the baseline. NBA corners sit 3 ft from the sideline; NCAA / NFHS use the geometry where the arc meets the corner.
- Mark the lane and restricted area. Lane width is 12 ft (NFHS / NCAA) or 16 ft (NBA). Add the 4-ft restricted-area arc under the basket for NCAA (since 2011-12) and NBA (since 1997); NFHS does not use one.
Frequently asked questions
What's the three-point distance for NBA vs NCAA vs high school?
NBA: 23 ft 9 in. at the top, 22 ft in the corners. NCAA: 22 ft 1¾ in. (men since 2019-20, women since 2021-22). NFHS high school: 19 ft 9 in.
How big is a high school basketball court?
84 ft long by 50 ft wide (NFHS). College and the NBA use a longer 94 × 50 ft floor; the width is the same at every level.
Is the NBA key wider than the college key?
Yes. The NBA lane is 16 ft wide; NCAA and high school use a 12-ft lane. The free-throw line is 15 ft from the backboard at every level.
What is the restricted-area arc?
A 4-ft-radius semicircle under the basket where a defender can't draw a charge. NCAA added it in 2011-12 and the NBA in 1997; NFHS does not use one.
What's different about a FIBA / international court?
FIBA courts are metric: 28 m × 15 m, with a rectangular key, a 6.75 m three-point arc, and a 1.25 m no-charge semicircle — all standardized in 2010.
Dimensions verified against current governing-body rule books. Updated through May 2026.