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As of 2008 the circumference of a regulation size baseball is between nine and nine and a quarter inches which converts to between about 7.3 cm and 7.5 cm in diameter according to the official rules of Major League Baseball (MLB).
Softball rules vary somewhat from those of baseball. Two major differences are that the ball must be pitched underhandâfrom 46 ft (14 m) for men or 43 ft (13.1 m) for women as compared with 60.5 ft (18.4 m) in baseballâand that seven innings instead of nine constitute a regulation game.