ERA Calculator
Calculate earned run average from earned runs, completed innings and extra outs.
Formula
ERA = earned runs × game innings / (whole innings + extra outs/3).
Earned run average ≈ (3)×(9)÷((9)+(0)÷3)
How to use
- Enter earned runs and whole innings pitched.
- Enter extra outs: 0, 1 or 2.
- Choose the game-innings basis, usually 9, and read ERA.
Examples
- 3 earned runs over 5 innings and 2 outs give ERA 4.76 on a 9-inning basis.
Frequently asked questions
What does 5.2 innings mean?
Baseball notation 5.2 means five innings and two outs, or 5⅔ innings.
Do all runs count?
Enter only runs recorded as earned by the official scorer.
Can I use a seven-inning game?
Yes. Set the basis to 7 if your competition uses it. At least one out must be recorded.
Sources
Updated: