ERA Calculator (Earned Run Average)
Use our ERA calculator to calculate earned run average from earned runs, innings pitched, and outs pitched. Includes the ERA formula, how to calculate ERA for a pitcher, and tips for calculating ERA in Excel.
What Is Earned Run Average?
Earned run average (ERA) is a pitching statistic that estimates how many earned runs a pitcher allows per nine innings.
An earned run is a run that scores without the help of defensive errors or passed balls (based on official scoring rules). ERA focuses on runs considered the pitcher’s responsibility.
A lower ERA generally indicates better pitching performance, though ERA can be influenced by ballpark, defense, and scoring decisions.
ERA Formula
ERA is earned runs divided by innings pitched, multiplied by 9. This calculator supports innings plus outs, converting outs to fractional innings.
3 outs = 1 inning. Outs should be 0, 1, or 2 for partial innings.
IP is total innings pitched in innings (including fractional innings).
ERA is scaled to 9 innings.
How to Calculate ERA
- 1
Enter earned runs (ER).
- 2
Enter innings pitched (whole innings).
- 3
Enter outs pitched (0, 1, or 2).
- 4
The calculator converts innings + outs into total innings pitched (IP).
Frequently Asked Questions
Use ERA = (earned runs ÷ innings pitched) × 9. If you have outs, convert to innings by adding outs ÷ 3.
If ER is in A2, innings in B2, and outs in C2, you can use: =(A2/(B2+(C2/3)))*9.
It depends on league and era, but lower is better. Compare pitchers within the same league and season for the most meaningful benchmark.
ERA estimates earned runs allowed per nine innings, focusing on runs not attributed to fielding errors.
Because ERA is standardized to a 9-inning game, making pitchers comparable even if they pitched different total innings.