What is the Strike Zone in Baseball?
The strike zone in baseball is a tricky subject as the strike zone changes with each batter. Accordingly, there is no “automatic” strike zone and much of what is a strike or not a strike is left to the judgment of the home plate umpire. In short, the strike zone extends from the batter’s knees to the letters across the front of his uniform. To be called a strike, the pitcher must throw the baseball across home plate, an area 17 inches wide (0.4318 meters), and between the knees and letters as indicated.
