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ERA Calculator

Enter the earned runs and innings pitched into this tool to calculate the Earned Run Average (ERA).

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The ERA calculator calculates the number of innings a pitcher has played and determines the earned run average based on the input values.

What Is ERA in Baseball?

ERA (Earned Run Average) is a baseball metric used to evaluate a pitcher's effectiveness more accurately than a simple win-loss record. It represents the average number of earned runs a pitcher allows per nine-inning game.

A lower ERA indicates strong pitching performance.
A higher ERA suggests the pitcher may be struggling.

Innings Per Sport:

Baseball: 9 innings
Softball: 7 innings
Little League: 6 or 7 innings
Cricket: 1 or 2 innings

ERA Formula

The Earned Run Average can be calculated using:

ERA = (Earned Runs / Innings Pitched) × Game Innings

Note: Each out pitched counts as 1/3 of an inning.

For more details, see Earned Run Average. The terms in the formula are:

Earned Runs (ER): Runs scored without the benefit of a fielding error before the third out of the inning.
Innings Pitched (IP): Total innings a pitcher has thrown. Each out equals 1/3 of an inning.
Game Innings: Total innings in the game (usually 9 for baseball, 7 for softball, or customized for other leagues).

How to Calculate ERA in Baseball?

ERA represents the average number of runs allowed per 9 innings. Here's an example calculation:

Example:

A pitcher has pitched 96 innings and 1 out, allowing 28 earned runs.

Solution:

Using the ERA formula:

ERA = [28 / (96 + 1/3)] × 9

ERA = (28 / 96.333) × 9

ERA = 0.29066 × 9

ERA = 2.616

FAQs

What is a Good ERA in Baseball?

A lower ERA indicates better pitching. An ERA under 2.5 in a standard 9-inning game is considered excellent.

Who has the Lowest ERA in MLB?

Tim Keefe holds the record for the lowest single-season ERA in history. Pitching 105 innings for the National League’s Troy Trojans, his ERA was an astonishing 0.86, more than half a run lower than any other pitcher that season.

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