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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).
At the youth level (Little League Baseball and Softball) there is no distinction between a baseball bat and a softball bat. A 30-inch youth bat is the same regardless of which sport it is used for. However, at the adult level noticeable and important differences between softball and baseball bats exist. As I will try to demonstrate on this page, adult baseball and softball bats are quite different.