Baseball ERA Calculator
Works out a pitcher’s earned run average.
ERA
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Earned runs per inning —
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The formula
ERA = innings per game × earned runs ÷ innings pitched
Each out is a third of an inning.
What to watch out for
Runs that score because of a fielding error are unearned and stay out of the count.
Frequently Asked Questions
What does 6.2 innings mean?
6 innings and 2 outs, or 6⅔. Three earned runs in that time is an ERA of 4.05.