ERA Calculator
Calculate a pitcher's earned run average. The result updates as you type, with the working underneath so you can check it.
Your details
Game length
Result
ERA
2.25
- Innings (decimal)
- 180.00
Good to know: ERA = 9 × ER ÷ IP
About this tool
Formula
ERA = 9 × ER ÷ IP
Questions people ask
How do partial innings work?
Baseball writes .1 for one out (⅓ inning) and .2 for two outs, which this calculator reads correctly.
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How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it.
Spotted a mistake? Tell us and we'll check it. How we check our calculators