How Baseball Scoring Works: Runs, Innings, Outs and Extra Innings
Baseball teams alternate batting in half-innings until three outs; a run generally scores when a runner legally reaches home, and the team with more runs after the required innings wins.
Timeline
- Half-inning: The visiting or home team bats until the defense records three outs.
- Full inning: After both teams have batted, the line score records their runs for the inning and cumulative total.
- End or extras: The game ends when the result is decided after regulation opportunities, or continues through extra innings if tied.
A baseball game is divided into innings, and each inning has two halves. The visiting team bats in the top half while the home team fields; the teams exchange roles in the bottom half. A half-inning normally ends when the fielding team records three outs. An out can result from a strikeout, a caught batted ball, a force play, a tag or another rule-defined retirement. Outs reset to zero when the sides switch. [1][2]
The offense scores a run when a runner legally advances around first, second and third base and reaches home plate. How the player originally reached base does not by itself determine whether the run counts. The timing of a third out can matter: some plays prevent an apparent run from scoring, which is why the scoreboard may change only after the umpire and official scorer resolve the play. [3][4]
A plate appearance begins with the batter facing the pitcher. Four balls generally award first base, three strikes generally produce a strikeout, and a fair ball can put the batter and existing runners in motion. A foul ball usually counts as a strike when the batter has fewer than two strikes, with special rules for bunts and caught foul balls. The small 0–3 or 2–2 display is the current ball-strike count, separate from the game's run score. [4]
A line score lists each team's runs by inning, followed by totals such as runs, hits and errors. Runs decide the winner; hits and errors provide context but are not additional points. An RBI credits a batter in many situations where a plate appearance produces a run, yet a team run can score without an RBI. Earned and unearned runs affect pitching statistics but both count equally in the team score. [3][5]
A standard MLB game is scheduled for nine innings. If the home team leads after the visitors make three outs in the top of the ninth, the bottom half is unnecessary. If the home team takes the lead during the bottom of the ninth or a later inning, the game ends immediately. If the score remains tied after both teams complete nine innings, play continues in extra innings until one side has an unanswered lead after the required opportunity. [1]
In MLB regular-season extra innings, each half-inning after the ninth begins with an automatic runner on second base. The runner is generally the player in the batting order immediately before the leadoff hitter, unless replaced. MLB states that this automatic-runner provision applies only to regular-season games; postseason extra innings begin without that placed runner. Rules can differ in minor, college, youth and international competitions, so identify the league before assuming the format. [6][7]
To read a live scoreboard, follow five items: inning and top or bottom indicator, runs, outs, count and occupied bases. Then ask whether the offense is creating a force by advancing the batter-runner and whether two outs make the next retirement the end of the half-inning. The official rules control edge cases, while the line score remains simple: after all required opportunities, the club with more runs wins. [1][2][3][4][6]
Sources
- MLB Glossary — Regulation Game
- MLB Glossary — Out
- MLB Glossary — Run
- MLB — Official Baseball Rules
- MLB Glossary — Runs Batted In
- MLB Glossary — Automatic Runner
- MLB — Extra-Innings Rules for the Postseason