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How is a pitchers Earned Run Average (ERA) calculated?

April 26, 2017average calculated earned era pitcher run

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How is a pitchers Earned Run Average (ERA) calculated?

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Multiply the total number of earned runs by 9 and divide the result by the total innings pitched. Say Randy Johnson has allowed 67 runs in 220 innings pitched. Multiply 67 (total earned runs allowed) by 9: 67 x 9 = 603. Divide 603 by 220 (total innings pitched): 603/220. His ERA would be 2.