The standard size of a Basketball in the NBA is 9.5 to 9.85 inches (24.1 to 25.0 cm) in diameter. In the NCAA, the diameter of a basketball cannot be larger than 30 inches, and women's basketballs are no larger than 29 inches.
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Basketball sizes are different for men and women. For men, an official basketball must have a circumference of 29.5 inches (74.9 cm) and must weigh 22 ounces (624 g). For women, the circumference must be 28.5 inches (72.4 cm) and must weigh 20 ounces (527 g).