Earned Run Average Calculator

Earned Run Average (ERA) Calculator calculator can be used to calculate a pitcher's performance in baseball by measuring the number of earned runs they allow per nine innings pitched.

Input Parameters

Calculation Results

Calculation Formula

ERA = (9 × Earned Runs) ÷ Innings Pitched

Where:
ERA = Earned Run Average
Earned Runs = Number of runs scored off a pitcher while they were pitching, excluding unearned runs
Innings Pitched = Total innings pitched by the pitcher

Result

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Earned Run Average (ERA)

Earned Run Average Calculator Calculator Usage Guide

Learn how to use the Earned Run Average Calculator calculator and its working principles

What is Earned Run Average (ERA)?

Earned Run Average (ERA) is a statistic used in baseball to measure a pitcher's effectiveness. It represents the number of earned runs a pitcher allows per nine innings pitched. The lower the ERA, the better the pitcher's performance.

How to Use This Calculator

  1. Enter the number of earned runs allowed by the pitcher
  2. Enter the total number of innings pitched (as a decimal, e.g., 7.2 for 7 and 2/3 innings)
  3. Click the Calculate button to compute the ERA
  4. Click Reset to clear all inputs and start over

Example Calculation

If a pitcher allows 3 earned runs over 6 innings pitched:

ERA = (9 × 3) ÷ 6 = 27 ÷ 6 = 4.50

Important Notes

  • Earned runs include all runs scored except those resulting from fielding errors or passed balls
  • ERA is typically compared among pitchers to assess their relative performance
  • The league average ERA varies by league and era, but a below-average ERA is generally considered good