What Size Are NBA Basketballs? Official Dimensions Explained

By Sarah Miller · July 25, 2043

NBA basketballs are size 7, with a circumference of 29.5 inches (74.9 cm) and a standard weight of 22 ounces (624 grams). This size is used for all professional games and by male players aged 12 and older.

Understanding NBA Basketball Sizes

The official size of an NBA basketball is standardized to ensure consistency across games, training, and player development. Known as Size 7, this ball is designed for optimal grip, control, and performance in professional play.

Key Specifications of an NBA Game Ball

Circumference: 29.5 inches (74.9 cm)
Diameter: Approximately 9.4 inches (23.9 cm)
Weight: 22 ounces (624 grams)
Material: Genuine leather (Spalding has been the official supplier for decades)
Pressure: Inflated to 7.5–8.5 psi

Why Size 7 is Used in the NBA

The choice of Size 7 is based on ergonomics, performance, and historical standards. It provides the ideal balance between hand fit and ball control for elite male athletes.

Factors Influencing Size Selection

Player Hand Size: Average NBA player hand length is around 7.5–8.5 inches, making Size 7 manageable for dribbling and shooting.
Game Speed: A consistent ball size ensures predictable bounce, pass accuracy, and shot mechanics.
Regulation Standards: The NBA enforces strict equipment rules to maintain fairness and integrity.

Comparison Across Leagues and Age Groups

While the NBA uses Size 7, other leagues and age groups use different sizes to match physical development and skill levels.

League / Category	Ball Size	Circumference (inches)	Weight (oz)	Recommended Age
NBA (Men)	7	29.5	22	12+
WNBA (Women)	6	28.5	20	12+
NCAA Men	7	29.5	22	12+
NCAA Women	6	28.5	20	12+
High School Boys	7	29.5	22	12+
High School Girls	6	28.5	20	12+
Youth (Ages 9–11)	5	27.5	17	9–11
Mini (Ages 5–8)	3	22	8	5–8

Table data source:1, 2, 3

The data shows a clear distinction between men’s and women’s basketballs at the professional and collegiate levels, with the WNBA and NCAA women using a smaller Size 6 ball for better handling. Youth sizes scale down significantly to support motor skill development. The consistency in Size 7 across men’s elite leagues highlights its role as the gold standard in competitive basketball.

Official NBA Game Ball Supplier

Spalding has been the official supplier of NBA game balls since 1983. In 2021, the NBA transitioned to using a synthetic composite leather ball for improved durability and moisture resistance, while maintaining the same size and weight specifications.

Features of the Official NBA Game Ball

Made with full-grain Horween leather (limited editions) or synthetic composite
8-panel construction for better symmetry
Micro-textured surface for enhanced grip
Consistent bounce and responsiveness

Frequently Asked Questions About NBA Basketball Sizes

What size basketball does the NBA use?

The NBA uses a Size 7 basketball with a 29.5-inch circumference and a weight of 22 ounces. This size is standard for all professional men’s games.

Is an NBA basketball bigger than college and high school balls?

No, the NBA, NCAA men’s, and high school boys’ leagues all use the same Size 7 ball (29.5 inches), ensuring a smooth transition from amateur to professional play.

Why doesn’t the NBA use a larger ball?

A larger ball would reduce handling precision and shooting consistency. The current Size 7 offers the best balance of control and challenge for elite athletes.

Do NBA players use the same size ball in practice?

Yes, NBA teams use identical Size 7 game balls in practice to maintain muscle memory and performance consistency.

How much air should an NBA basketball have?

An NBA basketball must be inflated to a pressure between 7.5 and 8.5 psi to meet league regulations and ensure proper bounce and feel during gameplay.