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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).
What is the weight of a Baseball ball? The weight of a standard baseball used in the MLB is between 5 and 5.25 ounces. It is made of a rubber core wrapped in twine with a leather skin over it.