What Size Is a Full-Size Basketball? Official Dimensions Explained

By Sarah Miller · February 19, 2050

A full-size basketball, used in professional and competitive play, measures 29.5 inches (75 cm) in circumference for men and 28.5 inches (72 cm) for women. These official sizes ensure consistent performance across leagues like the NBA, WNBA, and NCAA.

Understanding Full-Size Basketball Dimensions

The term "full size" refers to the standard basketball size used in adult competition. While many assume all full-size balls are identical, there are key distinctions based on gender and league regulations.

Key Characteristics of a Full-Size Basketball

Standard circumference: 29.5" for men, 28.5" for women
Weight: Approximately 22 ounces (624 grams)
Inflated pressure: 7.5–8.5 psi
Material: Leather, composite leather, or rubber depending on playing surface
Suitable for players aged 12 and up, especially in high school and professional leagues

Differences Between Men's and Women's Full-Size Basketballs

Although both are considered full size, the men’s and women’s basketballs differ slightly in circumference and weight to accommodate physiological differences.

Feature	NBA (Men)	WNBA (Women)	NCAA Men	NCAA Women
Circumference (inches)	29.5	28.5	29.5	28.5
Diameter (inches)	9.4	9.1	9.4	9.1
Weight (ounces)	22	20	22	20
Pressure (psi)	7.5–8.5	7.5–8.5	7.5–8.5	7.5–8.5
Ball Size Designation	Size 7	Size 6	Size 7	Size 6

Table data source:1, 2, 3

The data shows that while NBA and NCAA men use identical specifications (Size 7), WNBA and NCAA women use a smaller but still standardized ball (Size 6). The 1-inch difference in circumference significantly affects grip and shooting mechanics, making proper sizing essential for skill development.

Official Regulations by League

Major basketball organizations maintain strict standards to ensure fairness and consistency.

NBA and WNBA Standards

The National Basketball Association (NBA) mandates a Size 7 ball with a 29.5-inch circumference. The Women’s National Basketball Association (WNBA) uses a Size 6 ball at 28.5 inches, lighter and slightly smaller for optimal control.

NCAA and High School Guidelines

The NCAA follows the same size classifications: Size 7 for men’s teams and Size 6 for women’s. High school associations (NFHS) align with these standards, ensuring continuity from youth to collegiate levels.

How to Choose the Right Full-Size Basketball

Selecting the correct ball improves handling, shooting accuracy, and overall performance.

Factors to Consider

Player Age and Gender: Boys 12+ typically use Size 7; girls 12+ use Size 6.
Playing Surface: Leather for indoor hardwood; composite for outdoor or multipurpose courts.
League Requirements: Always verify if your league follows NBA, WNBA, or FIBA standards.
Grip and Feel: Try different brands (Spalding, Wilson, Molten) to find preferred texture and responsiveness.

Frequently Asked Questions About Full-Size Basketballs

What size is a full-size basketball for men?

A full-size basketball for men measures 29.5 inches in circumference and is designated as Size 7. It is used in the NBA, NCAA men’s basketball, and most adult leagues worldwide.

Is a women’s full-size basketball smaller than a men’s?

Yes, a women’s full-size basketball is 28.5 inches in circumference (Size 6), compared to 29.5 inches (Size 7) for men. This adjustment improves handling and shooting efficiency for female players.

Can kids use a full-size basketball?

Players under 12 should typically use smaller sizes (Size 5 or 6) to develop proper technique. Most coaches recommend transitioning to a full-size ball around age 12–14, depending on physical development.

What is the weight of a full-size basketball?

A men’s full-size basketball weighs approximately 22 ounces (624 grams), while a women’s full-size ball weighs about 20 ounces (567 grams).

Are all full-size basketballs the same brand and material?

No, full-size basketballs vary by brand (e.g., Spalding, Wilson, Molten) and material. Indoor balls are often genuine or synthetic leather; outdoor models use durable composite or rubber to withstand rough surfaces.