Era Calculator
Calculate a baseball pitcher's Earned Run Average (ERA) based on earned runs allowed and innings pitched.
Published by:
isCalculator Editorial Team
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How to use this tool?
Follow these steps to calculate a pitcher's ERA:
- Enter Earned Runs — Input the number of earned runs allowed (e.g., 45). Must be a whole number (0 or higher).
- Enter Innings Pitched — Input total innings pitched in decimal format (e.g., 120.2 for 120⅔). Use tenths for fractional innings (e.g., 7.2 for 7⅔, 8.0 for 8 full innings).
- Click "Calculate ERA" — The result shows ERA rounded to two decimals. If innings pitched is 0, ERA displays as "Infinite".
- Review the breakdown — Below the result, see the formula: ERA = (Earned Runs ÷ Innings Pitched) × 9, with step-by-step math.
Note: The calculator automatically converts decimal innings (e.g., 7.2) to actual outs for accurate computation. All inputs must be non-negative numbers.
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Frequently Asked Questions
ERA stands for Earned Run Average, a statistic that measures the average number of earned runs a pitcher allows per nine innings pitched.
ERA is calculated as (Earned Runs / Innings Pitched) × 9.
A lower ERA indicates better performance, as it means the pitcher allows fewer earned runs per nine innings.
