Q&A for How to Calculate ERA (Earned Run Average)

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A buddy of mine started an inning, walked the bases full, then got pulled out. The guy after him cashed in all his runs. That's the first and only time my buddy has pitched. What's his ERA?

Donagan

Top Answerer

If -- as it sounds -- your friend never got an out, that means he worked zero innings officially, and that means his ERA (so far) is infinity.

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Question

What would it be for 12 innings, 1 run off error?

Donagan

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If no earned runs were allowed, the ERA is zero.

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Question

Can a pitcher make a fielding error?

Community Answer

Absolutely. If a weak ground ball is hit and the pitcher bobbles the ball while fielding it, making the throw to first for the out late, he receives an E1.

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How do I calculate an ERA for the season if the number of innings played changed every game?

Donagan

Top Answerer

Use the total number of innings pitched so far in the season.

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Question

If a game goes to more than nine innings, do I multiply by that number instead of 9?

Community Answer

No. A standard game is still 9 innings. ERA is based off of a standard game. The extra innings would be reflected in the number of innings pitched.

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Question

How do passed balls affect ERA?

Donagan

Top Answerer

A passed ball has no effect on a pitcher's ERA. A passed ball is roughly the same as an error and would not play a part in the scoring of an earned run.

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Question

My son is a closer. He appeared in 8 games, had 5 saves. He gave up a total of four runs in those 8 appearances. He never gave up more then one run in any appearance. Why is his ERA 2.24?

Community Answer

ERA does not reflect performance in a single game. It's calculated by using three statistics: total earned runs allowed so far in the season, total innings pitched so far, and number of innings contained in a typical game (usually nine or seven).

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What is the ERA for 64 innings and 7 runs given up?

Donagan

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.098. That's "oh ninety-eight." This assumes that all seven runs were earned, and that a standard game is considered to be nine innings. If you consider seven innings to be standard, the ERA is .076.

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What is the ERA for 54 innings and 6 runs given up?

Community Answer

The ERA would be 0.99, assuming 9 innings is standard and that all 6 of the runs were earned.

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How do I calculate ERA when fewer than 9 innings have been played?

Community Answer

You take the total number of runs allowed and divide it by the number of innings pitched. Then multiply that number by 9.

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