How to Calculate ERA in Baseball

How to Calculate ERA in Baseball. A pitcher’s ERA, or earned run average, measures
how many earned runs they allowed during a game. Learn how to calculate ERA, and see if your
favorite pitcher is really as strong as he seems. You will need Calculator and basic understanding
of baseball. Step 1. Determine the total number of innings pitched. For partially played innings, add in one-third
of an inning for each out recorded. For example, if a pitcher threw 6 full innings,
then recorded one out in the seventh, he threw 6 1/3 innings. Step 2. Calculate the total number of earned runs
allowed. For innings where no errors occurred, this
will be the total number of runs. If errors did occur, add in only the runs
that would have scored had there not been an error. Remember to include earned runs that might
come after the pitcher leaves the game. If a hitter gets on base against a pitcher,
that runner is his responsibility, even if the pitcher has been taken out of the game. Step 3. Divide the total number of earned runs by
the total number of innings pitched. Step 4. Multiply by 9, and round this number to 2
decimal places to find the pitcher’s ERA. For Major League ball players, an ERA of 4
is about average, and an ERA of 2 or less is excellent. Did you know Ed Walsh, who played with the
Chicago White Sox from 1904 to 1916, has the lowest career ERA in Major League baseball
at 1.82. But the statistic is unofficial, since the
American League didn’t accept ERA as a statistic until 1913.

14 thoughts on “How to Calculate ERA in Baseball

  1. MLB notates ⅓ of an inning as .1, and ⅔ of an inning as .2. This incorrect notation is lowering the overall ERA of the pitchers. I'm glad you did it the correct way in this video.

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