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Earned Run Average calculator is used to calculate the earned run average of a player or pitcher in baseball. Baseball ERA is a measure of the performance of a player. This online ERA calculator can be used to check the player’s performance in any baseball leagues around the world. Our MLB ERA calculator is fast and efficient in calculating earned run average. It can calculate ERA baseball for MLB, NL, AL, Minor Baseball League, and any other leagues in the world.

We will discuss what does ERA mean in baseball, its formula, history of baseball, and much more in this space.

To calculate ERA using the above calculator, you should identify the following things first.

- Earned Runs
- Innings Pitched
- Outs Pitched
- Game Innings

After getting these values, enter all of them in the given input boxes one by one. Make sure to enter all of these four values in the corresponding input boxes. After entering the values, press the **“Calculate” **button. It will instantly calculate the earned run average of the pitcher and show you the result.

ERA stands for earned run average, is an indicator of the performance of a pitcher. ERA takes into account the time that a player took for pitching and his performance in all nine innings.

By definition, the ERA is the average value of the total number of runs that are given by a pitcher in all innings. There is a total of 7 innings in softball games, 6 innings in little league games, and 9 innings in regular games. If there are defensive glitches during the game, the run will be deemed unearned, and ERA estimates will not consider it.

The lower ERA score is better in general. Ed Walsh, who played from 1904 to 1917, has the lowest average of 1.82 in history. After the rule changes since 1920, Mariano Rivera, who played baseball in years 1995-2013, is now the lowest ERA average holder, which is 2.21.

ERA can be calculated by using the following formula:

Earned Runs Average or ERA = (Earned runs / Pitched Innings) × Total innings

In this equation:

Earned runs are the total runs that are scored minus runs due to error. Pitched innings are the total number of innings pitched by a player. Total innings are the total number of innings in a game, and it can vary depending on the game. Typically, there are 9 innings in a standard baseball game. Let’s discuss how is era calculated?

Earned run average can be calculated by dividing the total number of runs earned by the total number of pitched innings by a player and multiplying the answer by total innings in the game.

We will calculate ERA by using an example. Suppose a pitcher in a baseball game has pitched a total of 60 innings and allowed 20 earned runs with 3 outs. ERA can be calculated by following the steps given below.

- First of all, count the number of innings pitched by players. Each out represents 1 / 3 of an inning. For this example, pitched innings will be:

Pitched innings = 60 + 3/3 = 61.

- Now check the total number of innings in the game. We will assume 9 innings.

**Total innings = 9**

- Substitute all values in the era equation.

ERA = (Earned runs / Pitched innings) × Total innings

ERA = (20 / 61) × 9

ERA = 2.95

- So, with the given earned score (20), pitched innings (60), and 3 outs, the ERA score will be 2.95 for that pitcher.

Ed Walsh having 1.82 and Mariano Rivera with 2.21 earned runs average, are two players who have had the best career ERA score in history. MLB honors players with the lowest average in each league, separately. Let's see the greatest ERA players in the last ten years in the season.

**National League**

Year | Leader | ERA | Team |

2018 | Jacob deGrom | 1.70 | New York Mets |

2017 | Clayton Kershaw | 2.31 | Los Angeles Dodgers |

2016 | Kyle Hendricks | 2.13 | Chicago Cubs |

2015 | Zack Greinke | 1.66 | Los Angeles Dodgers |

2014 | Clayton Kershaw | 1.77 | Los Angeles Dodgers |

2013 | Clayton Kershaw | 1.83 | Los Angeles Dodgers |

2012 | Clayton Kershaw | 2.53 | Los Angeles Dodgers |

2011 | Clayton Kershaw | 2.28 | Los Angeles Dodgers |

2010 | Josh Johnson | 2.30 | Florida Marlins |

2009 | Chris Carpenter | 2.24 | St. Louis Cardinals |

2008 | Johan Santana | 2.53 | New York Mets |

**American League**

Year | Leader | ERA | Team |

2018 | Blake Snell | 1.89 | Tampa Bay Rays |

2017 | Corey Kluber | 2.25 | Cleveland Indians |

2016 | Aaron Sanchez | 3.00 | Toronto Blue Jays |

2015 | David Price | 2.45 | Detroit Tigers Toronto Blue Jays |

2014 | Félix Hernández | 2.14 | Seattle Mariners |

2013 | Aníbal Sánchez | 2.57 | Los Angeles Dodgers |

2012 | David Price | 2.56 | Tampa Bay Rays |

2011 | Justin Verlander | 2.40 | Detroit Tigers |

2010 | Félix Hernández | 2.27 | Seattle Mariners |

2009 | Zack Greinke | 2.16 | Kansas City Royals |

2008 | Cliff Lee | 2.54 | Cleveland Indians |