In baseball statistics, earned run average (ERA) is the average of earned runs allowed by a pitcher per nine innings pitched (i.e. the traditional length of a game). It is determined by dividing the number of earned runs allowed by the number of innings pitched and multiplying by nine.

Earned run average represents the number of earned runs a pitcher allows per nine innings -- with earned runs being any runs that scored without the aid of an error or a passed ball. ERA is the most commonly accepted statistical tool for evaluating pitchers.

The ERA Calculator is used to calculate the ERA (earned run average) used in baseball statistics. What is ERA? In baseball statistics, Earned Run Average, or ERA, is one of the most well-known pitching statistics and represents the average number of earned runs a pitcher will give up per nine-inning game.

Feb 16, 2010 · Earned Run Average (ERA) is a rudimentary metric designed to assess how well a pitcher has prevented runs in the past. Given that a pitcher’s job is to aid in the prevention of run scoring, ERA...

Dec 20, 2024 · Most runs — usually somewhere between 91 and 93% of them at an MLB-wide level in a given season — are of the earned variety. However, a run is considered unearned if it scored because of an error or a passed ball. The run doesn’t need to score on the play in which the error was committed, though.

May 15, 2022 · A pitcher's Earned Run Average (aka ERA) is a primary measure of his success. It is similar, but not identical to, run average. It is expressed as an average number of opponents' earned runs scored per notional nine inning game: ERA = (Earned Runs Allowed * 9) / …

May 24, 2023 · ERA is a baseball acronym that stands for Earned Run Average. It is a metric that measures the number of earned runs a pitcher allows per nine innings pitched. ERA works by factoring in the number of innings pitched and the total …

May 22, 2023 · Earned Run Average, or ERA, lies at the heart of evaluating a pitcher's effectiveness in a baseball game. Developed by English-American sportswriter and statistician Henry Chadwick, ERA measures the number of earned runs allowed per nine innings pitched.

Jan 22, 2024 · Earned Run Average, commonly known as ERA, stands as a fundamental metric in the realm of baseball statistics. It serves as a barometer of a pitcher's effectiveness, encapsulating their ability to thwart opposing batters and prevent runs from scoring.