Earned Run Average

ER X 9 / IP
(Earned Runs Times 9 Divided by Innings Pitched)

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  • The average number of runs per 9 inning game attributed. . .    
  • . . . to a given pitcher and not to team fielding errors
  • Good results and bad results are combined and averaged. . .
  • . . . to get a number that indicates a pitcher's overall effectiveness!  
  • It takes lots of good outings to bring down a lousy ERA. . .
  • . . .but one really bad outing can blow a good ERA sky-high!
    • DID YOU KNOW THAT

  • Ed Walsh has the lowest ERA of any pitcher in baseball history?
  • His career earned run average: 1.82
                              
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