About ERA CALCULATOR (Formula)
The ERA (Earned Run Average) calculator is a formula used in baseball to measure a pitcher’s effectiveness by determining the number of earned runs they give up per nine innings pitched. The formula for ERA is:
ERA = (Earned Runs * 9) / Innings Pitched
Where “Earned Runs” is the number of runs scored by the opposing team that was earned (not including runs scored as a result of errors or passed balls) and “Innings Pitched” is the number of innings pitched by the pitcher.
The resulting number is the number of earned runs the pitcher gives up per nine innings pitched. A lower ERA indicates a better performance by the pitcher.