The Strike Zone, Explained
Quick answer
The strike zone is the space over home plate between the midpoint of the batter’s shoulders and the top of the pants (the top edge) and the hollow beneath the kneecap (the bottom edge), judged from the batter’s stance as they prepare to swing. Any pitch that passes through this three-dimensional zone is a strike.
The official boundaries
The strike zone is a three-dimensional space over home plate. A pitch is a strike if any part of the ball passes through it. Its edges are defined by the batter's stance:
- Top: the midpoint between the top of the shoulders and the top of the pants
- Bottom: the hollow beneath the kneecap
- Width: the 17-inch width of home plate
Diagram
How it’s actually called
The rulebook zone and the called zone are not identical. Umpires judge the top and bottom from the batter's stance as they prepare to swing, and in youth ball the zone is often called a little wider to keep games moving and encourage hitters to swing.
For young players the practical lesson is simple: anything near the plate and between the knees and the chest is likely to be called a strike, so hitters should be ready to swing at strikes rather than waiting for a perfect pitch.
About the author
The Baseball Tools Team
baseball.tools publishes free, plain-English baseball tools and guides for players, parents and coaches. Content is reviewed for accuracy against official sources and updated each season.