ERA Calculator
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What is ERA (Earned Run Average)?
**Earned Run Average (ERA)** is widely considered one of the most important statistics in baseball for evaluating a pitcher's effectiveness. It represents the average number of earned runs a pitcher gives up for every nine innings pitched.
A lower ERA indicates a better performance, meaning the pitcher allows fewer runs to score. Our free ERA calculator helps you quickly compute this statistic using standard baseball rules, including proper handling of partial innings (e.g., 5.1 or 5.2 IP).
ERA Formula
The standard formula to calculate ERA is:
For leagues that play fewer innings per game (like High School or Little League, which often play 7 or 6 innings), you simply replace "9" with the number of innings in a regulation game.
What is a Good ERA?
ERA standards can vary by era and league, but generally:
- Under 3.00: Excellent. This is All-Star caliber performance.
- 3.00 - 4.00: Above Average. Reliable starting pitcher.
- 4.00 - 5.00: Average. Typical for a back-of-the-rotation starter.
- Over 5.00: Below Average. Needs improvement.