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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).
There is no difference between a High school baseball and a MLB baseball, let alone a High School ball and college ball. The circufrence of the ball is 9 inches and the weightâ¦ is 5 ounces. Although, there is no difference in size between the baseballs, the seams of a high school and college baseball are raised.