Calculate earned run averageTo calculate earned run average (ERA) of a baseball player, just use the following formula: Earned run average = (Number of earned runs × 9)/(number of innings pitched) The formula above applies only to pitchers and it is used to determine how good a pitcher is. The formula is used to find out how many runs a pitcher allows in a baseball game. The lower this average, the better the pitcher is at not allowing runs in the game Pitchers usually practice a lot to keep this number as low as possible. When computing this average, we usually round answers to two decimal places Example #1: A baseball player had the following performance: Allowed 4 runs 15 innings pitched Earned run average = (Number of earned runs × 9)/(number of innings pitched) Earned run average = (4 × 9)/(15) Earned run average = (36)/(15) Earned run average = 2.4 After rounding the answer to two decimal places, we get earned run average = 2.40 Example #2: A baseball player had the following performance: Allowed 7 runs 34 innings pitched Earned run average = (Number of earned runs × 9)/(number of innings pitched) Earned run average = (7 × 9)/(34) Earned run average = (63)/(34) Earned run average = 1.852941 After rounding the answer to two decimal places, we get earned run average = 1.85 Example #3: A baseball player had the following performance: Allowed 5 runs 32 innings pitched Earned run average = (Number of earned runs × 9)/(number of innings pitched) Earned run average = (5 × 9)/(32) Earned run average = (45)/(32) Earned run average = 1.40625 After rounding the answer to two decimal places, we get earned run average = 1.41 If you are a baseball coach, you may want to choose the player in example #3 because his average is lower. However, no one so far was able to get an earned run average of 1.41. The ERA by the player in example #2 is close to what top players of all time were able to meet 




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