ERA Calculator
Find a baseball or softball pitcher's earned run average.
About the ERA Calculator
Enter the earned runs allowed, the innings pitched as written in the box score (152.1 means 152 and one out), and the innings in a game. The calculator gives the ERA and the innings and outs it used.
ERA is earned runs allowed per nine innings (seven in softball and many youth leagues). Innings pitched are written with .1 and .2 for one and two outs, so 152.1 innings is 152⅓, not 152.1.
The formula
ERA = earned runs × 9 ÷ innings pitched
Worked example
45 earned runs in 152.1 innings
- 152.1 = 152⅓ innings = 457 outs
- ERA = 45 × 9 ÷ 152.333 = 2.66
Questions people ask
What's a good ERA?
In MLB, under 3.00 is excellent and around 4.00 is roughly average.
What's an earned run?
A run that scored without an error or passed ball being responsible.
How do I enter softball innings?
Set innings per game to 7.