Standard Basketball Court Dimensions for a Backyard

What size is a backyard basketball court? No source we read gives an official backyard court size. The official numbers describe competition courts. This guide lays them out, shows what one hoop maker suggests for a home court, and marks where the sources go quiet.

What Are the Official Full-Court Sizes?

The NBA and NCAA both list a court 94 feet long and 50 feet wide, while NFHS labels 84 by 50 feet as optimum. The NBA prints its figures on the court diagram, not in the rule text. FIBA gives 28 meters by 15 meters, measured from the inner edge of the boundary line.

The NFHS diagram carries a note that its information is “suggestive only; it is not required by NFHS rules”. That is why this guide calls 84 by 50 feet optimum, not a requirement.

Once you pick a size, the basketball court concrete calculator handles the concrete quantity. This guide stays with the dimensions.

Where Do the Free-Throw and Three-Point Lines Sit?

The free-throw line is 15 feet from the backboard face in the NBA rules and the NFHS diagram, but three-point distances differ by rule set. The NCAA diagram also shows 15 feet for the free-throw line.

The NBA arc is 23 ft 9 in from the middle of the basket, with 22 ft in the corners. The NCAA 2026-27 diagram gives 22 ft 1 3/4 in at the arc and 21 ft 7 7/8 in in the corners. NFHS prints 19 ft 9 in. An older, undated NCAA diagram shows different three-point numbers, so check the edition.

Lane width also differs: 16 ft in the NBA diagram and 12 ft in the NCAA diagram. The NBA adds a restricted area, a half-circle 4 ft from the center of the basket ring. The NFHS diagram marks the free-throw semicircle and the center circle at 6 ft to the outside edge of the line.

How High Is the Rim, and What Adjusts?

The NBA rules put the upper edge of the ring 10 feet above the floor. Goalrilla, a hoop maker, calls 10 feet the NBA and NCAA regulation height.

Its hoops adjust from 7.5 to 10 feet, and its installation guide describes 7.5 feet as its safety-approved height. This guide did not verify rim height from NCAA, NFHS or FIBA documents. Check the rule book for your league.

The NBA rule text also lists an 18 inch inside ring diameter and a backboard of 6 feet by 3 1/2 feet.

How Much Open Space Surrounds a Court?

The NCAA and NFHS diagrams give a 3 foot minimum of unobstructed space outside the boundary, with 10 feet preferable. The NFHS diagram adds a rule for courts that cannot give 3 feet: mark a narrow broken 1 inch line 3 feet inside the boundary.

FIBA sets the floor at no less than 32 by 19 meters. Its rules want obstructions at least 2 meters from the court.

These figures are written for competition courts. The documents do not say whether they apply to a backyard.

Backyard Basketball Court Dimensions: One Maker’s Suggestions

Goalrilla suggests planning 20 to 30 feet of depth and 25 to 35 feet of width for a home court. That is one brand’s suggestion for home hoop installs, not a standard from any rule body.

• Distance from buildings. Keep at least 15 to 20 feet between the hoop and your house or garage, per its location guide (accessed 2026-10-19).
• Pavement in front of the goal. Its buying guide (accessed 2026-10-19) wants at least 10 feet of concrete, preferably closer to 15 feet, which it calls the free-throw line distance.
• Seating. Leave 3 to 6 feet behind the baseline or along one sideline.
• Overhang. Its installation guide (accessed 2026-10-19) mentions approximately 2 to 4 feet of overhang. It warns that a 5 foot overhang would encroach on the play surface by more than 7 feet.

How Do Full, High School, Junior High and Half Courts Compare?

The areas run from 4,700 square feet for a full court down to 2,350 square feet for a half court. This is arithmetic from the sizes above.

• Full court: 94 x 50 = 4,700 sq ft.
• High school (NFHS optimum): 84 x 50 = 4,200 sq ft.
• Junior high (some courts): 74 x 42 = 3,108 sq ft.
• Half court: 47 x 50 = 2,350 sq ft, which is 4,700 / 2.

The 74 by 42 size comes from a Saint Paul Parks and Recreation maintenance manual (2017-18). It says a high school court is typically 84 by 50 feet and some junior high courts measure 74 by 42 feet. A half court is half of a full court here; the sources we read do not define one.

Goalrilla’s planning ranges also give areas. The low end is 20 x 25 = 500 sq ft, and the high end is 30 x 35 = 1,050 sq ft. Against a 4,700 sq ft full court, that is 500 / 4,700 = 10.6 percent and 1,050 / 4,700 = 22.3 percent. Rounded, that is about 11 and 22 percent. FIBA’s 28 by 15 meters is 420 square meters, and this guide does not convert between feet and meters.

For slab work, see the slabs and flatwork calculators, the concrete slab calculator and the control joint spacing calculator.

What Do the Sources Not Say?

The sources give no official backyard or half-court size. Several other gaps matter when you plan a home court.

• No home standard. No official or industry size for a backyard or residential half court was found.
• No half-court definition. No rule book we read defines a half court.
• Clearance. The 3 foot and 10 foot figures are written for competition courts.
• Unverified figures. NFHS lane width, NFHS basket height, and NCAA and FIBA basket heights were not verified from their own documents. The NBA 2026-27 rulebook was not read.

FAQs About Basketball Court Dimensions

Sources and Further Reading

These figures come from published rule documents, one city manual and one hoop maker’s suggestions. Official rules govern competition courts only, so size a home court to your yard and your hoop maker’s guidance. Reviewed for accuracy by Prof. Dr. Khalil Mudassar, PhD. Last updated 2026-10-19.