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ERA Calculator

Enter total earned runs:
Enter number of innings pitched: (2.33 = 2 1/3 innings, 2.67 = 2 2/3 innings, etc.)
Enter number of innings in regulation game:
Earned Run Average:

The ERA Calculator is an easy-to-use web tool for baseball fans and players to calculate a pitcher’s Earned Run Average (ERA). ERA is one of the most popular statistics used to measure pitching performance in baseball. We will provide an overview of ERA, explain how to use the ERA Calculator, and answer frequently asked questions.

What is ERA?

ERA stands for Earned Run Average. It indicates the average number of earned runs a pitcher surrenders per 9 innings pitched. In other words, ERA measures the effectiveness of a pitcher at preventing runs that are not the result of fielding errors. A lower ERA generally indicates a better pitching performance.

How ERA is Calculated

The formula for calculating ERA is:

ERA = (Earned Runs Allowed x 9) / Innings Pitched

  • Earned Runs Allowed are runs given up by the pitcher that are not due to fielding errors or passed balls.
  • Innings Pitched measures the number of innings thrown by the pitcher.
  • The number 9 is used because baseball games last 9 innings. So ERA measures average runs allowed per 9 inning game.

The resulting number indicates the average number of earned runs the pitcher surrenders per 9 innings pitched.

Importance of ERA

ERA is considered one of the best measures of pitching effectiveness. It is more indicative of the pitcher’s performance than other stats like Wins and Losses which depend greatly on run support from the offense. ERA statistics allow coaches, fans, and scouts to accurately judge and compare pitchers.

How to Use the ERA Calculator

Using the ERA Calculator to determine a pitcher’s ERA is simple:

  1. Enter the Earned Runs Allowed
  2. Enter the Innings Pitched
  3. The tool automatically calculates the ERA

You can calculate ERA for a single game or an entire season by entering the cumulative totals.

Helpful Hints

  • Pay close attention to the Innings Pitched. Be sure to use the actual innings pitched, not the rounded total. The most accurate ERAs are calculated using fractional innings.
  • For career ERAs, add up all the runs and innings pitched over a pitcher’s entire career before calculating the ERA.
  • Avoid errors by double checking your inputs. One mistake can significantly skew the calculated ERA.

All-Time Career Leaders

Rank ERA Player Team(s) Year(s)
1 1.82 Ed Walsh Boston (NL) 1904–17
2 1.89 Addie Joss Cleveland (AL) 1902–10
3 1.89 Jim Devlin Louisville (NL) 1875–77
4 2.02 Jack Pfiester Chicago (NL) 1903–04, 1906–11
5 2.03 Smoky Joe Wood Cleveland (AL) 1908–15, 1917–22

Frequently Asked Questions

What is a good ERA?

ERAs below 4.00 are generally considered above average. The league average usually falls around 4.00 as well. Some of the best pitchers have ERAs in the 2’s and lower. Therecord for the lowest career ERA is 1.82.

What stats do I need to calculate ERA with this tool?

You only need two stats – Earned Runs Allowed and Innings Pitched. The tool takes care of the rest.

What if there is an error during gameplay?

Do not include runs scored due to errors as Earned Runs Allowed when calculating ERA. Only runs given up by the pitcher that did not involve errors should be included.

Can I use the ERA calculator for other sports?

No, ERA only measures pitching effectiveness in baseball. However, the underlying concept of comparing runs allowed to defensive opportunities could be applied to develop similar statistics for other sports.

By following this guide, anyone can learn about ERA, accurately calculate it using the user-friendly web tool, and leverage ERA to better evaluate pitching performance. Whether you are a fan wanting to understand the game better or a player looking to track your progress, the ERA Calculator is a valuable resource.