Earned run average

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One of the important individual pitching statistics is earned run average (or earned runs average or ERA). It is calculated by mulitplying the number of earned runs (ER) a pitcher allows by 9, and then dividing by the number of innings pitched (IP).

ERA = ER × 9 ÷ IP

ERA Records

The lowest ERA achieved by a pitcher over a season, with at least 100 IP, is 1.54, held by Ricky Terrazas in 2012. The lowest career ERA, with at least 500 IP, is held by Iron Arm with 2.23.

References