Enter earned runs, innings, and outs pitched. ERA updates automatically.
ERA (Earned Run Average) is the most widely used statistic to measure a pitcher's effectiveness in baseball. It represents the average number of earned runs a pitcher allows per nine innings pitched — giving coaches, scouts, and fans a quick, standardized way to compare pitchers across different contexts.
Unlike total runs allowed, ERA filters out errors and passed balls, focusing purely on a pitcher's own performance. Whether you're evaluating a starter's full season or a reliever's single outing, our ERA calculator gives you instant, accurate results.
ERA updates instantly as you type — no need to click calculate. See changes the moment you enter innings or runs.
Track additional outs separately to get a precise innings-pitched value — critical for relief pitchers and short outings.
Works for softball, little league, and non-standard formats. Adjust innings per game in the advanced settings.
Our calculator is designed to be fast and intuitive. Follow these steps to get an accurate earned run average in seconds:
Type in the number of earned runs the pitcher allowed. Remember: unearned runs caused by fielding errors do not count toward ERA.
Enter the number of complete innings. If the pitcher left mid-inning, use the "Additional Outs" field to account for partial innings (0, 1, or 2 extra outs).
Standard baseball uses 9-inning games. Open Advanced Settings to change this for softball (7 innings), little league, or other formats.
Your ERA appears instantly in both the result field and the Pitcher Summary panel on the right, along with a performance rating.
ERA = (Earned Runs ÷ Total Innings Pitched) × Innings Per Game — where Total Innings Pitched = Full Innings + (Additional Outs ÷ 3).
Use this scale to interpret your ERA results in the context of Major League Baseball standards. Ratings may vary for amateur and youth leagues where run production is typically higher.
Elite pitcher. Ace-level performance. Top of MLB rotations.
Above-average starter. Reliable and competitive at a high level.
League-average. Common for mid-rotation starters and long relievers.
Below average. Indicates the pitcher is struggling to limit runs.
Here are some reference ERA values to help you understand how different run totals and inning combinations affect the final figure:
| Earned Runs | Innings Pitched | ERA (9-inning game) | Rating |
|---|---|---|---|
| 1 | 6.0 | 1.50 | Excellent |
| 2 | 7.0 | 2.57 | Excellent |
| 3 | 7.0 | 3.86 | Good |
| 3 | 6.0 | 4.50 | Average |
| 4 | 6.0 | 6.00 | High ERA |
| 5 | 5.0 | 9.00 | High ERA |
| 0 | 9.0 | 0.00 | Shutout |
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