Summary
The diameter of a basketball is between 9.43 and 9.51 inches (24 to 24.2 cm) according to the NBA and competitive professional basketball
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, and 9.4 to 9.6 inches (24 to 25 cm) according to other sources.
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The circumference of a basketball is 9.6 to 9.8 inches (24 to 25 cm).
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Basketballs used in the NCAA are between 9.39 and 9.55 inches for men and 9.07 and 9.23 inches for women.
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According to
