The official size of the basketball used by the NBA is 29.5 inches in circumference. That’s the same size used throughout men’s college and high school basketball leagues.
A basketball is a spherical ball used in basketball games. Basketballs usually range in size from very small promotional items that are only a few inches (some centimeters) in diameter to extra large balls nearly 2 feet (60 cm) in diameter used in training exercises. For example, a youth basketball could be 27 inches (69 cm) in circumference, while a National Collegiate Athletic Association (NCAA) men's ball would be a maximum of 30 inches (76 cm) and an NCAA women's ball would be a maximum ...
In 1894 the first basketball was marketed. It was laced, measured close to 32 inches (81 cm), or about 4 inches (10 cm) larger than the soccer ball, in circumference, and weighed less than 20 ounces (567 grams). By 1948–49, when the laceless molded ball was made official, the size had been set at 30 inches (76 cm).
This is official size for high school, college, and the pros. Size 6: 28.5" 20 oz: Boys ages 12-14. Girls and women ages 12 and up. This is the official size for women’s high school, college, and pro basketball. Size 5: 27.5" 17 oz: Boys and girls ages 9-11 years old. This is the standard youth basketball you find in most stores. Size 4: 25.5" 14 oz
Gonzaga Women's Basketball Team, 1986-87. It was the early 80’s, and the popularity of women’s basketball was on the rise. With women now competing at a high level, one question remained: should women continue using the men’s size ball or move to a ball size more suited to them?
More Basketball Size History images
They created a leather ball that was sewn together with laces, having a rubber bladder inside. The ball weighed a bit less than 20 ounces, and it was of brown color. The first basketball’s had a circumference of 32 inches, which was about four inches bigger than a standard soccer ball.
One of the most significant developments in basketball design came in 1942, when the first moulded basketball was created. These balls, constructed in factories, were, for the first time in the sport's history, all created with a regulation circumference of 76 centimetres.
In 1924, rules for court sizes suggested that courts could be a maximum of 90 by 50 feet and a minimum of 60 feet by 3 feet. The basket rim height was 10 feet and remains that way in 2011. Early courts had no 3-point line.