Work out earned run average instantly with clear inputs, formula shown and shareable results.
ERA is earned runs divided by innings pitched, scaled to a full game length, which is nine innings in baseball and seven in most softball codes. Scaling to game length is what makes ERA comparable, and it is why the same pitcher's ERA looks lower under a seven inning format.
Earned run average
ERA = earned runs / innings pitched x innings in a full game
ERA = earned runs / innings pitched x innings in a full game. ERA is earned runs divided by innings pitched, scaled to a full game length, which is nine innings in baseball and seven in most softball codes.
Scaling to game length is what makes ERA comparable, and it is why the same pitcher's ERA looks lower under a seven inning format.
Enter earned runs allowed, innings pitched, innings in a full game. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.