How do you calculate baseball era?

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Found a bill buckner firstbaseman glove at garage sale.wonder if it would ever be worth anything?

(Earned Runs/Innings Pitched) x 9

Say I gave up 40 earned runs in 100 innings

id have a ERA of 3.60 (appx)

dont forget the nine because ERA is per 9 innings

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NY Yankees?

ERA is Earned Run Average per 9 innings pitched

(Earned Runs / Innings Pitched) x 9

An earned run is defined as a run that the pitcher is responsible for (not the direct result of a fielder's error)

One inning is equal to 3 outs - If the pitcher gets 9 batters out, he pitched 3 innings. If he gets 10 batters out he pitched 3 and 1/3rd Innings (showed as 3.1 IP in box scores) - 11 outs equals 3 and 2/3rd's Innings (or 3.2 IP as it would appear in box scores)

The equation is mutliplied by 9, to represent how many earned runs a Pitcher allows on average over the course of a full game

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