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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).
Confidence votes 7.3K. Baseball fields vary in size from a small little league fields to larger professional base ball fields. the size of the infield (area between the bases) is 3600 sq. feet (60 ft baseline) for little league fields and 8100 sq. feet (90 ft. baseline) for larger fields.