"The strike zone is defined as that area over home plate the upper limit of which is a horizontal line at the midpoint between the top of the shoulders and the top of the uniform pants, and the lower level is a line at the hollow beneath the kneecap."
"With the implementation of the Automated Ball-Strike (ABS) system, these ambiguities have been quashed, defining the top of the strike zone at precisely 53.5 percent of a hitter's height, and the bottom at 27 percent of the player's height."
"Even extremely accurate machines are not exact. According to MLB, the ABS system's margin of error is approximately one sixth, or 17 percent, of an inch."
The 2026 MLB rules define a strike as when any part of the ball passes through the strike zone, which is determined by the batter's height. The strike zone's upper limit is set at 53.5% of a batter's height, while the lower limit is at 27%. The Automated Ball-Strike system eliminates human error by using precise measurements, although it still has a margin of error of about 17% of an inch. This system aims to provide consistency in strike calls.
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