ERA Calculator

Baseball ERA Calculator – Calculate Pitcher’s Earned Run Average

ERA Calculator

Calculate a pitcher’s Earned Run Average

Note: Use .1 for 1/3 inning and .2 for 2/3 inning

Earned Run Average

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About ERA

Earned Run Average (ERA) is a statistic in baseball that measures the average number of earned runs a pitcher allows per nine innings pitched.

ERA = (Earned Runs × 9) ÷ Innings Pitched

An earned run is any run that scores against a pitcher without the benefit of an error or a passed ball.

Example: If a pitcher allows 15 earned runs in 45 innings pitched, their ERA would be (15 × 9) ÷ 45 = 3.00

In general:

  • ERA below 2.00: Elite / Cy Young caliber
  • ERA 2.00-3.00: Excellent / All-Star level
  • ERA 3.00-4.00: Very good / Solid starter
  • ERA 4.00-5.00: Average / Serviceable pitcher
  • ERA above 5.00: Below average / Needs improvement

Features of this ERA Calculator:

  1. Clean Baseball-Themed Design:
    • Blue and yellow color scheme reminiscent of baseball
    • Glass-morphism effect for the calculator container
    • Responsive layout that works on all devices
  2. User-Friendly Interface:
    • Clear input fields for earned runs and innings pitched
    • Instructions for entering partial innings (using .1 for 1/3 inning and .2 for 2/3 inning)
    • Prominent calculate and reset buttons
  3. Complete Functionality:
    • Calculates ERA using the standard formula: (Earned Runs × 9) ÷ Innings Pitched
    • Input validation to ensure only valid numbers are accepted
    • Results displayed with two decimal places
    • Performance evaluation based on the calculated ERA
  4. Educational Content:
    • Clear explanation of what ERA is
    • Formula display for transparency
    • Context about what different ERA values mean
    • Example calculation for reference