The ERA Calculator helps baseball players, coaches, scouts, and fans quickly compute a pitcher's earned run average — the most widely used metric for evaluating pitching performance. All calculations run locally in your browser, so your data stays completely private. Whether you are a baseball coach evaluating pitcher performance, a fantasy league manager making roster decisions, or a sports analyst comparing historical players, ERA is the standard metric for measuring a pitchers effectiveness.
How to Use
- 1Enter Innings Pitched — Type the number of complete innings the pitcher has thrown.
- 2Select Additional Outs — Choose 0, 1, or 2 outs for partial innings.
- 3Enter Earned Runs — Add the total earned runs allowed by the pitcher.
- 4See instant results — ERA, innings pitched, and RA9 update as you type, with a visual rating bar.
The Formula
Why ERA Matters
Tips for Best Results
An ERA under 3.00 is considered excellent in modern baseball. Under 4.00 is above average. Remember to only count earned runs — unearned runs from fielding errors do not affect ERA.
Frequently Asked Questions
ERA stands for Earned Run Average. It measures how many earned runs a pitcher allows per nine innings pitched and is the primary statistic used to evaluate pitching performance.
ERA is calculated by dividing total earned runs by total innings pitched, then multiplying by 9. The formula is: ERA = (Earned Runs / Innings Pitched) × 9.
In MLB, an ERA below 3.00 is excellent, between 3.00 and 4.00 is very good, and below 5.00 is average. An ERA above 6.00 is generally considered poor.
Yes, the ERA Calculator is completely free to use with no subscriptions or hidden fees.
Absolutely. All calculations happen locally in your browser. Your numbers never leave your device.
You need innings pitched (full innings plus partial outs) and earned runs allowed. The tool handles the conversion of outs to decimal innings automatically.
ERA only counts earned runs, while RA9 (runs allowed per nine innings) counts all runs including unearned runs from errors. ERA is the standard metric.
It correctly interprets 6.2 as 6 and 2/3 innings (20 outs), not 6.2 decimal innings.
In MLB, sub-3.00 is elite, 3.00-4.00 is above average, 4.00-5.00 is average, above 5.00 needs improvement.
No, ERA only counts runs charged to the specific pitcher. Inherited runners scoring count against the previous pitcher.
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