Earned run average scales earned runs to a standard game length.
ERA Calculator
Form
Results
Earned Run Average
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Table of Contents
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What is ERA Calculator?
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How to Use This Calculator
- Enter or select Earned Runs, Innings Pitched, Outs Pitched, Game Innings.
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
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Formula Used
ERA = earned runs × game innings/(innings pitched+outs/3)
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Variables Explained
| Input | What it means |
|---|---|
| Earned Runs | Use the measured or stated value for this item, with the unit or category shown beside the field. |
| Innings Pitched | Use the measured or stated value for this item, with the unit or category shown beside the field. |
| Outs Pitched | Use the measured or stated value for this item, with the unit or category shown beside the field. |
| Game Innings | Use the measured or stated value for this item, with the unit or category shown beside the field. |
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Worked Example
Three earned runs over 6 full innings in a 9-inning game give ERA=4.50.
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Why Use This Calculator?
Use the estimate to compare similar sessions or measurements taken under consistent conditions. A change in technique, measurement method or formula can change the result without a real change in fitness.
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Common Mistakes
- Baseball’s 6.2 notation means six innings and two outs, not 6.2 decimal innings.
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Frequently Asked Questions
Is a calculated estimate the same as a measured result?
No. A formula summarizes a relationship observed under particular conditions. Technique, fatigue, body measurements and the testing protocol can change an actual performance or measurement.
Can I compare results from different formulas?
Check which equation and input definitions each page uses. A change caused by switching methods is not necessarily a change in fitness.
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Sources & References
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