## 7/28/11

### How to Calculate Earned Run Average / ERA in Baseball

In baseball, the skill of a pitcher is measured by the pitcher's earned run average or ERA. Calculating this is easy. Please read on to learn how to Calculate Earned Run Average / ERA in Baseball

Difficulty:
Easy

## Instructions

• 1
The first step to doing this is understanding that an Earned run average in baseball or ERA is calculated by taking the amount of 'earned' runs times nine and dividing this figure by the total number of innings pitched.
• 2
Next, you'll need to know that an 'earned' run is when a baseball player scores without the benefit of an error.
• 3
Determine how many times the opposing teams scored (without the benefit of an error) while that pitcher was pitching.
• 4
Then multiply that how many times the opposing teams scored by 9. For example if the opposing teams scored 10 runs against that pitcher, multiply 10 x 9 = 90. 90 would be the amount of "earned" runs times nine. Remember, don't count the ones scored on errors.
• 5
Determine how many innings of baseball the pitcher has actually pitched over the course of the season. If he pitched 9 games, 5 innings per game, he pitched 45 innings for example.
• 6
Then, understand that earned run average in baseball or ERA is calculated by taking the amount of earned runs times nine and dividing this figure by the total number of innings pitched.
• 7
Finally, to sum up using the above examples, if our baseball pitcher pitched fifty innings and gave up 10 runs x 9 (90) during 45 innings of play, you would divide 90 by 45 = 2.00. 2.00 would be the pitchers Earned Run Average or ERA