ERA Calculator
Calculate a pitcher's Earned Run Average (ERA) with this free, easy-to-use calculator. Perfect for baseball coaches, players, and fans.
ERA Formula
Where Total Innings Pitched = Innings + (Outs ÷ 3)
Calculation Example
Let's calculate ERA for a pitcher with these stats:
Total Innings = 30 + (2 ÷ 3) = 30.67
ERA = (10 × 9) ÷ 30.67 = 2.94
An ERA of 2.94 is considered excellent in professional baseball.
About Earned Run Average (ERA)
ERA (Earned Run Average) is one of the most important statistics in baseball for evaluating pitchers. It represents the average number of earned runs a pitcher allows per nine innings pitched (or per standard game). Lower ERA values indicate better pitching performance.
Frequently Asked Questions
In Major League Baseball (MLB):
- Below 2.00: Exceptional (Cy Young contender)
- 2.00 - 3.00: Excellent (All-Star level)
- 3.00 - 4.00: Good (Solid starter)
- 4.00 - 5.00: Average
- Above 5.00: Below average
Baseball innings are measured in thirds (3 outs = 1 inning). If a pitcher leaves a game with 1 or 2 outs in an inning, those partial innings must be included for accurate ERA calculation. For example, 5.1 innings means 5 full innings plus 1 out (⅓ of an inning).
Earned runs are runs that score without the benefit of an error or a passed ball. Unearned runs, which result from defensive mistakes, do not count toward a pitcher's ERA. This makes ERA a better measure of pure pitching performance.
