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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).
Quick Answer. The mass of a baseball is about 145 grams or approximately 5.11 ounces. According to the Major League Baseball website, an official baseball cannot weigh less than 5 ounces or more than 5.25 ounces. Continue Reading