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# How To Calculate ERA In Baseball

By: Brian Neese

Break Studios Contributing Writer

Learning how to calculate ERA in baseball is important if you want to find out your earned run average (ERA) or the ERA of someone else.  Finding the ERA in baseball is relatively simple, using a formula to help determine the calculation.  Take the following steps into account to calculate ERA in baseball.

1. Errors do not count.  If a batter reaches on an error, even if it is by the pitcher, do not count towards a pitcher's ERA.  Also, runners that are on base from another pitcher do not count.
2. Divide your total earned runs by innings pitched.  These two statistics will help determine your ERA.  You will simply take your earned runs allowed and divide that by the total innings pitched.
3. Multiply by 9.  You will then need to multiply the value from the second step by nine, for the number of innings in a game of baseball.
4. You now have the pitcher's ERA calculation.  Once you have divided the two numbers and have multiplied by nine, the ERA is calculated.
5. You can figure out further statistics from the ERA.  From the ERA, you can figure you splits which may be helpful.  For instance, you could calculate a pitcher's ERA based on home or away, lefty versus righty, and other situations.  Also more complicated sabermetrics can be found.  Quick ERA, defense-independent ERA, component ERA, and peripheral ERA exist as more complicated yet interesting calculations that can be made.  Take the time to look at these to see if they are appropriate to your needs.
Posted on: Apr. 20, 2010