How do you come up with ERA's?

Question

crazydave · Accepted Answer

It's the number of earned runs mulitiplied by 9 then divided by the number of innings pitched.

Patrick L · Answer

number of earned runs allowed times 9 divided by number of innings pitched.  This does not include unearned runs.  

If a pitcher gives up 2 earned runs in 8 innings of work it's 2 times 9 (18) divided by 8  the answer would be 2.25

18 gibbs 20 · Answer

Earned runs allowed times nine divided by innings pitched

Tara ♥s Brian McCann · Answer

Simple;
you average the number of earned runs per 9 innings.

Hence the name: EARNED RUN AVERAGE

How do you come up with ERA's?

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