ANSWERS: 2
  • The formula is: (earned runs x 9) divided by innings pitched. This will give you the average number of runs a pitcher has allowed in each nine-inning subset of his total innings pitched. So, for example, if a pitcher has 18 innings behind him, and he allowed 2 earned runs in those 18 innings, his ERA is 1.00.
  • Earned Runs x 9 / Innings Pitched

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