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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).
1 The most standard way to determine the size of a softball bat is by your height and weight. 2  Players who stand under four feet tall should use a bat measuring 26 to 29 inches in length. 3  Players between four and five feet will best benefit from a bat length of 29 to 31 inches.