According to the the Official Basketball Rules approved by the FIBA Central Board: For men's competition the ball's circumference will be between 749 millimeters and 780 millimeters (29.5 inches and 30.7 inches) and weigh between 567 grams and 650 grams (20 ounces and 23 ounces). For women's competition the ball's circumference will be between 724 millimeters and 737 millimeters (28.5 inches and 29 inches) and weigh between 510 grams and 567 grams (18 ounces and 20 ounces).
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