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ERA Calculator
Find a pitcher’s earned run average.
ERA
—
Earned run average.
| Per 9 innings | — |
|---|---|
| Earned runs | — |
| Innings | — |
| — |
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How the ERA Calculator Works
Earned run average (ERA) is the number of earned runs a pitcher gives up per nine innings — the length of a standard game. Divide earned runs by innings pitched, then multiply by nine. A pitcher who allows 3 earned runs over 6 innings has a 4.50 ERA.
Lower is better: an ERA under 3.00 is excellent, around 4.00 is average, and above 5.00 is poor. Only earned runs count — runs that score due to errors are excluded.
ERA = earned runs ÷ innings pitched × 9
Frequently Asked Questions
How do you calculate ERA?
Divide earned runs by innings pitched and multiply by nine. 3 earned runs in 6 innings is a 4.50 ERA.
What is a good ERA?
Under 3.00 is excellent, around 4.00 is league average, and over 5.00 is poor.
What counts as an earned run?
A run the pitcher is responsible for — runs that score because of fielding errors are unearned and don’t count.
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