Nearly every pitch thrown in a baseball game feeds into a running tally known as the count, and understanding how that count builds is essential to following the sport. This article walks through the strike zone, how balls and strikes accumulate, what happens when a batter walks or strikes out, how foul balls factor in, and the different ways a batter can be put out.
The Strike Zone
At the center of every pitch is the strike zone, an imaginary box over home plate that defines the area a pitch must pass through to be called a strike if the batter doesn't swing. The strike zone's width is set by the width of home plate, while its height is defined relative to the individual batter, generally spanning from around the midpoint of the torso down to just below the kneecap, with the exact boundaries defined in the official rulebook of the governing league. Because the zone's height is tied to each batter's stance and body, it can look slightly different from one hitter to the next, which is why umpires are trained to judge it specific to the batter standing at the plate for that pitch.
The home plate umpire is responsible for judging whether each pitch passes through the strike zone and making the call of ball or strike accordingly, unless the batter swings, in which case the location of the pitch becomes irrelevant to that specific call.
How the Count Builds
The count refers to the running total of balls and strikes on a batter during a single at-bat, conventionally expressed as balls first and strikes second, such as a count of two balls and one strike. Every pitch thrown during an at-bat adds to this count in one of two ways:
- A pitch outside the strike zone that the batter does not swing at is called a ball.
- A pitch inside the strike zone that the batter does not swing at, or any pitch the batter swings at and misses, is called a strike.
The count resets to zero balls and zero strikes at the start of every new batter's at-bat. As the count progresses pitch by pitch, it eventually reaches one of two thresholds that end the at-bat: four balls results in a walk, while three strikes results in a strikeout, with a couple of important nuances described below.
Walks and Strikeouts
When a batter accumulates four balls before accumulating three strikes, the result is a walk, formally called a base on balls. The batter is awarded first base without needing to put the ball in play, since the pitcher failed to throw enough pitches inside the strike zone that the batter was willing to swing at.
When a batter accumulates three strikes, the result is a strikeout, and the batter is out. A strikeout can happen either because the batter swung and missed on the third strike or because the batter did not swing at a pitch that the umpire ruled to be in the strike zone, commonly described as a called strikeout or a backwards strikeout in informal commentary. In most situations, a strikeout is a clean out, though certain rule sets include an exception, often called the uncaught third strike rule, in which a batter may attempt to reach first base if the catcher fails to cleanly catch the third strike, depending on the specific base-runner situation defined in the rulebook.
Foul Balls and the Count
A foul ball is any batted ball that lands outside the boundaries of fair territory, and foul balls interact with the count in a distinctive way. A foul ball is counted as a strike, with one major exception: a foul ball cannot be the third strike that ends an at-bat via strikeout, unless it's a foul bunt, which is typically ruled a strikeout even on the third strike. This means that once a batter reaches two strikes, they can foul off pitch after pitch without ever striking out from a foul ball alone, continuing the at-bat indefinitely until they either put the ball in play, draw a walk, or swing and miss or take a called third strike.
This quirk is part of why some at-bats can last far longer than others, with a determined hitter fouling off many pitches in a row while working the count in their favor.
How Outs Are Recorded
A strikeout is only one of several ways a batter or baserunner can be put out. Common types of outs include:
- Strikeout: the batter accumulates three strikes, as described above.
- Flyout: a fielder catches a batted ball in the air before it touches the ground, regardless of whether it was hit on the ground, in a line, or high into the air.
- Groundout: the batter hits the ball on the ground, and a fielder throws it to first base ahead of the batter's arrival, or otherwise records the out through a force play.
- Force out: a baserunner is out because they were obligated to advance to the next base and a fielder reached that base with the ball before the runner arrived.
- Tag out: a fielder touches a baserunner with the ball, or with a glove holding the ball, while the runner is not touching a base they're entitled to occupy.
Each of these out types counts the same toward the half-inning's total, regardless of how it occurred. Once three outs have been recorded against the batting team, the half-inning ends immediately, and the two teams exchange roles between batting and fielding, regardless of the count on the batter currently at the plate.
Quick Recap
- The strike zone is the area over home plate a pitch must pass through to be a strike if the batter doesn't swing.
- The count tracks balls and strikes, written as balls-then-strikes, and resets with each new batter.
- Four balls produce a walk; three strikes produce a strikeout.
- Foul balls count as strikes but cannot cause a strikeout on the third strike, except for foul bunts.
- Outs can come from strikeouts, flyouts, groundouts, force outs, and tag outs, among other methods.
- A half-inning ends the instant the batting team records its third out.