This earned run average calculator is tool for baseball that measures a pitcher’s effectiveness by calculating the average number of earned runs they allow per nine innings pitched.
An earned run is specifically attributed to the pitcher’s responsibility, occurring when runs score without the aid of errors or passed balls. If a batter hits a home run, that’s an earned run because the pitcher is directly responsible.
Earned Run Average Calculator
| Scenario | Innings Pitched | Earned Runs | ERA Calculation | Final ERA |
|---|---|---|---|---|
| Complete Game | 9.0 | 2 | (2 × 9) ÷ 9 | 2.00 |
| Relief Appearance | 2.1 | 1 | (1 × 9) ÷ 2.33 | 3.86 |
| Seven Inning Game | 7.0 | 3 | (3 × 9) ÷ 7 | 3.86 |
| Multiple Games | 18.2 | 8 | (8 × 9) ÷ 18.67 | 3.86 |
| Short Start | 4.0 | 5 | (5 × 9) ÷ 4 | 11.25 |
| Long Relief Appearance | 5.0 | 2 | (2 × 9) ÷ 5 | 3.60 |
| Quality Start | 6.0 | 1 | (1 × 9) ÷ 6 | 1.50 |
| Poor Performance | 3.0 | 6 | (6 × 9) ÷ 3 | 18.00 |
| Excellent Relief | 3.2 | 0 | (0 × 9) ÷ 3.67 | 0.00 |
| Extended Relief Appearance | 4.2 | 4 | (4 × 9) ÷ 4.67 | 7.71 |
| Spot Start | 5.1 | 2 | (2 × 9) ÷ 5.33 | 3.38 |
| High-Scoring Game | 7.0 | 5 | (5 × 9) ÷ 7 | 6.43 |
| Extra Innings Game | 10.0 | 4 | (4 × 9) ÷ 10 | 3.60 |
| Complete Game Shutout | 9.0 | 0 | (0 × 9) ÷ 9 | 0.00 |
Earned Run Average Calculation Formula
The standard ERA formula is expressed as:
ERA = (Earned Runs × 9) ÷ Innings PitchedIf a pitcher allows 4 earned runs over 6 innings pitched:
ERA = (4 × 9) ÷ 6
ERA = 36 ÷ 6
ERA = 6.00How to Calculate Earned Run Average?
Calculating ERA involves these detailed steps:
- Track Earned Runs: Record all runs that score without the benefit of errors or passed balls.
- Log Innings Pitched: Document complete innings and partial innings.
- Convert Partial Innings: Transform partial innings into decimals (1/3 inning = 0.33, 2/3 inning = 0.67).
- Apply the Formula: Multiply earned runs by 9, then divide by innings pitched.
A pitcher has thrown 7⅔ innings (7.67 innings) and allowed 3 earned runs:
ERA = (3 × 9) ÷ 7.67
ERA = 27 ÷ 7.67
ERA = 3.52What is a Good Earned Run Average in Baseball?
ERA quality typically falls into these categories:
- Excellent: Below 2.00
- Very Good: 2.00-3.00
- Average: 3.00-4.00
- Below Average: 4.00-5.00
- Poor: Above 5.00
The interpretation of ERA varies by level of play, era, and ballpark factors. In Major League Baseball’s modern era, an ERA below 3.00 is considered exceptional. For 2023, Blake Snell led the National League with a 2.25 ERA, demonstrating elite-level performance.
How to Calculate ERA in 7 Inning Game?
For seven-inning games, using formula ERA = (Earned Runs × 9) ÷ Innings Pitched, in doubleheaders or certain league formats, the ERA calculation needs adjustment to maintain the nine-inning standard:
ERA = (Earned Runs × 9) ÷ 7If a pitcher throws a complete 7-inning game allowing 2 earned runs:
ERA = (2 × 9) ÷ 7
ERA = 18 ÷ 7
ERA = 2.57References
- MLB.com Official Statistics: https://www.mlb.com/stats
- Baseball Reference Statistical Glossary: https://www.baseball-reference.com/bullpen/ERA
- FanGraphs Sabermetrics Library: https://library.fangraphs.com/pitching/era/
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