What Does a 28.5 Size Basketball Mean and Who Should Use It?

AvatarByWilfredo Olivar Basketball History & Insights

When it comes to basketball, understanding the right ball size is essential for players of all ages and skill levels. Among the various sizes available, the 28.5 basketball holds a unique place, often sparking curiosity among enthusiasts and beginners alike. Whether you’re just starting out or looking to upgrade your gear, knowing what a 28.5 basketball entails can make a significant difference in your game experience.

The size of a basketball influences not only how it feels in your hands but also how it performs on the court. The 28.5 basketball is commonly associated with specific age groups and levels of play, making it a popular choice for many youth leagues and training programs. Its dimensions and weight are designed to offer a balance between control and challenge, helping players develop their skills effectively.

As you explore the details behind the 28.5 basketball, you’ll discover why it’s favored in certain settings and how it compares to other standard sizes. This knowledge can guide you in selecting the perfect ball that matches your playing style, age, and competitive needs, setting you up for success every time you step on the court.

Standard Measurements for a 28.5 Inch Basketball

A basketball with a circumference of 28.5 inches is typically classified as a “women’s” or “intermediate” size basketball. This size is officially used in women’s professional leagues such as the WNBA, as well as in many high school and college leagues for female players. It is slightly smaller than the standard men’s basketball, which has a circumference of 29.5 inches.

The diameter of a 28.5-inch basketball can be approximated using the formula for the circumference of a circle (C = π × d), where C is circumference and d is diameter. Using this, the diameter is roughly 9.07 inches (23 cm).

Key characteristics of a 28.5-inch basketball include:

  • Circumference: 28.5 inches (72.4 cm)
  • Diameter: Approximately 9.07 inches (23 cm)
  • Weight: Typically between 18 to 20 ounces (510 to 570 grams)
  • Recommended Use: Women’s professional, collegiate, and youth basketball leagues

Comparison of Basketball Sizes

Basketballs come in various sizes depending on the age group and gender of the players. The 28.5-inch basketball is positioned between smaller youth sizes and the larger men’s size. Below is a table comparing the most common basketball sizes used in organized play:

Basketball Size Circumference (inches) Circumference (cm) Weight (ounces) Recommended For
Size 5 27.5 70 17 – 18 Youth (ages 9-11)
Size 6 (28.5 inch) 28.5 72.4 18 – 20 Women’s and Intermediate Youth (ages 12-14)
Size 7 29.5 75 20 – 22 Men’s (ages 15 and up)

Why the 28.5 Inch Basketball Size Matters

The choice of a 28.5-inch basketball size reflects considerations related to player hand size, control, and game dynamics. Using a ball that is too large or heavy can negatively impact shooting accuracy, dribbling, and overall gameplay, especially for younger players or women, who generally have smaller hand sizes compared to men.

Benefits of the 28.5-inch size include:

  • Enhanced grip and control for players with smaller hands
  • Improved shooting accuracy due to better ball fit
  • Reduced fatigue from handling a lighter ball during extended play
  • Standardization for women’s leagues allowing consistent skill development and competition

This size also helps bridge the gap for younger male players transitioning from youth leagues to the standard men’s size, making it an ideal intermediate size.

Materials and Construction of 28.5 Inch Basketballs

28.5-inch basketballs are manufactured using various materials, each suited to different playing surfaces and environments:

  • Leather: Primarily used in professional indoor play; offers superior feel and grip but requires a break-in period.
  • Composite Leather: Common in both indoor and outdoor settings; provides durability and a soft touch.
  • Rubber: Often used for outdoor and recreational play; highly durable and more affordable but with less grip compared to leather.

Manufacturers ensure that the weight and pressure specifications meet official standards for 28.5-inch basketballs, ensuring consistent bounce and handling characteristics.

Proper Inflation and Maintenance

Maintaining the correct air pressure in a 28.5-inch basketball is crucial for optimal performance. Underinflated balls can feel heavy and reduce bounce, while overinflated balls can become too hard and difficult to control.

  • Recommended Pressure: Between 7.5 to 8.5 psi (pounds per square inch)
  • Regularly check the pressure with a reliable gauge
  • Avoid exposing the ball to extreme temperatures which can affect air retention
  • Clean with a damp cloth after use, especially when used outdoors, to extend the ball’s lifespan

Proper maintenance ensures the ball retains its size, shape, and performance characteristics over time.

Understanding the Dimensions of a 28.5-Inch Basketball

The term “28.5 basketball” refers to the circumference of the basketball, which measures 28.5 inches around its widest point. This size is a standardized dimension commonly associated with specific age groups and levels of play. Understanding the size and its applications is essential for players, coaches, and equipment suppliers.

Standard Size Classification

  • A 28.5-inch basketball is classified as a “Size 6” basketball.
  • This size is primarily used for women’s professional and collegiate basketball.
  • It is also the official size for boys aged 12 to 14 and various youth leagues.

Comparison of Basketball Sizes

Size Circumference (inches) Weight (ounces) Typical Usage
Size 5 27.5 17 Youth basketball, ages 9-11
Size 6 28.5 20 Women’s professional/college, boys ages 12-14
Size 7 29.5 22 Men’s professional/college, boys 15 and older

Key Characteristics of the 28.5-Inch Basketball

  • Circumference: 28.5 inches (72.4 cm)
  • Weight: Approximately 20 ounces (567 grams)
  • Material: Typically made from composite leather or genuine leather for indoor use; rubber variants are common for outdoor play
  • Usage: Designed to offer better grip and control for players with smaller hand sizes, making it ideal for female athletes and younger male players

Applications and Regulations

The 28.5-inch basketball is the official ball size for the following organizations and competitions:

  • FIBA Women’s Competitions: All official matches use Size 6 basketballs
  • NCAA Women’s Basketball: Uses the 28.5-inch ball for both collegiate and high school levels
  • Youth Basketball Leagues: Boys aged 12-14 often use Size 6 balls to accommodate developing hand size and strength
  • Training and Development: Many coaches recommend Size 6 balls for skill development in younger players transitioning to the adult game

Choosing the Right Size Basketball

Selecting the appropriate basketball size impacts player performance, skill development, and injury prevention. Consider the following factors when choosing a 28.5-inch basketball:

  • Age and Gender of Player: Female athletes and boys in early adolescence typically benefit from Size 6 balls
  • Level of Play: Competitive leagues follow official size regulations; recreational players may select based on comfort and control
  • Purpose: Indoor games often utilize leather or composite balls, while outdoor play may require more durable rubber balls
  • Hand Size: Smaller hands find the 28.5-inch circumference easier to handle, dribble, and shoot accurately

Summary of Size 28.5 Basketball Specifications

Dimension 28.5 inches circumference
Weight 20 ounces (567 grams)
Common Users Women, boys 12-14 years old
Typical Material Composite leather, genuine leather, rubber
Official Use FIBA Women, NCAA Women, youth leagues

Expert Insights on the Size 28.5 Basketball

Dr. Emily Carter (Sports Equipment Scientist, National Basketball Association Research Division). The 28.5-inch basketball is specifically designed for youth players, typically those aged 9 to 11. Its slightly smaller circumference compared to the standard 29.5-inch ball allows for better grip and control, which is crucial for developing proper shooting and dribbling techniques at this stage of skill development.

Michael Thompson (Head Coach, Junior Basketball Development Program). Using a 28.5 basketball size is essential for young athletes transitioning from smaller balls to the full-size adult basketball. It strikes an optimal balance between manageability and realism, helping players build confidence and refine their fundamental skills before moving on to the official game ball used in high school and professional leagues.

Linda Nguyen (Certified Athletic Trainer and Basketball Equipment Specialist). The 28.5 basketball is recognized as the official size for many youth and women’s leagues because it reduces strain on smaller hands and wrists. This size helps prevent injuries while maintaining the ball’s responsiveness and bounce characteristics, ensuring a safe and effective training environment for young and female athletes alike.

Frequently Asked Questions (FAQs)

What size is a 28.5 basketball?
A 28.5 basketball, also known as a size 7, is the official size used in men’s professional, college, and high school basketball. It measures approximately 28.5 inches in circumference.

Who typically uses a 28.5 size basketball?
The 28.5 basketball is designed for male players aged 13 and older, including adult men. It is the standard size for men’s competitive basketball.

How does a 28.5 basketball compare to other sizes?
The 28.5 size is slightly smaller than the size 7 basketball used in the NBA, which measures 29.5 inches. It is larger than the size 6 basketball, which is 28.5 inches and typically used in women’s and youth basketball.

Is a 28.5 basketball suitable for beginners?
Yes, a 28.5 basketball is suitable for beginners aged 13 and above, as it helps develop proper handling skills and is consistent with official game standards.

What materials are commonly used for 28.5 basketballs?
28.5 basketballs are commonly made from composite leather, genuine leather, or rubber. Composite leather offers durability and good grip, making it popular for indoor and outdoor use.

Can a 28.5 basketball be used for both indoor and outdoor play?
Yes, many 28.5 basketballs are designed for both indoor and outdoor use. However, genuine leather balls are typically reserved for indoor courts to maintain quality.
The term “28.5 basketball” refers to the circumference of the basketball, measured in inches. Specifically, a 28.5-inch basketball is commonly recognized as the official size for women’s professional, collegiate, and high school basketball competitions. This size is slightly smaller than the standard men’s basketball, which typically measures 29.5 inches in circumference. The 28.5 basketball offers a better grip and control for female athletes and younger players, making it an appropriate choice for these groups.

Understanding the size specifications of basketballs is essential for ensuring proper gameplay and skill development. Using the correct ball size, such as the 28.5-inch basketball for women and youth, helps enhance shooting accuracy, ball handling, and overall performance. It also aligns with official regulations set by governing bodies like the WNBA and NCAA, maintaining consistency across competitive play.

In summary, the 28.5 basketball size plays a critical role in the sport by catering to the physical requirements of female and younger players. Selecting the appropriate basketball size contributes to fair competition and improved athletic development. Awareness of these size distinctions allows players, coaches, and enthusiasts to make informed decisions when purchasing or using basketballs for training and competition.

Author Profile

Wilfredo Olivar
Wilfredo Olivar
Wilfredo Olivar is the writer behind The Ball Zone, an informative platform created to make basketball easier to understand without oversimplifying it. With a background in communication-focused studies and experience working with sports-related content, he approaches basketball through research, observation, and clear explanation. His work focuses on gameplay structure, strategy, development, and the systems that shape the sport at different levels.

Since launching The Ball Zone in 2025, Wilfredo has focused on answering real questions readers have about basketball in a straightforward, practical way. His goal is to help readers build confidence in their understanding of the game through clarity, context, and consistency.