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ERA Calculator

Our free ERA calculator helps you calculate the Earned Run Average (ERA) for baseball pitchers. This essential ERA calculator tool measures pitching performance by calculating the average number of earned runs a pitcher allows per nine innings pitched.

Features

Accurate ERA Calculator Tool

Our ERA calculator ensures precise ERA calculations following the official baseball formula: (Earned Runs ÷ Innings Pitched) × 9.

Partial Inning Support

This ERA calculator accounts for partial innings by allowing you to enter the number of outs recorded (1/3 of an inning each).

Customizable Game Length

Our versatile ERA calculator adjusts calculations for different game formats including MLB (9 innings), softball (7 innings), or little league games.

How to Use Our Free ERA Calculator

Calculate a pitcher's ERA in a few simple steps with this baseball ERA calculator.

  1. 1

    Enter Earned Runs

    Input the number of earned runs allowed by the pitcher into the ERA calculator.

  2. 2

    Input Innings Pitched

    Enter the total complete innings pitched by the pitcher in the ERA calculator.

  3. 3

    Add Any Extra Outs

    If applicable, add the number of additional outs recorded in a partial inning (0-2) to the ERA calculator.

  4. 4

    Set Game Length

    Keep the default 9 innings in the ERA calculator or adjust for other game formats as needed.

  5. 5

    Calculate

    Click the 'Calculate ERA' button to get the result from our ERA calculator.

Frequently Asked Questions

ERA is valued because it focuses on what a pitcher can control – preventing earned runs – while filtering out runs that score due to fielding errors. This makes the ERA calculator a more accurate tool for measuring a pitcher's effectiveness than simply looking at total runs allowed.

In baseball, each out represents 1/3 of an inning. So if a pitcher completes 6 innings and gets 2 outs in the 7th inning before being replaced, their innings pitched would be 6⅔ or approximately 6.67 innings when entered into an ERA calculator.

While ERA measures actual runs allowed and is calculated with a standard ERA calculator, Fielding Independent Pitching (FIP) estimates a pitcher's performance based solely on outcomes they directly control (strikeouts, walks, hit batters, and home runs), removing defensive factors entirely.

Ed Walsh holds the record for the lowest career ERA in MLB history at 1.82, pitching from 1904 to 1917. Among modern era pitchers (post-1920), Clayton Kershaw has one of the lowest career ERAs according to baseball ERA calculators.