Baseball ERA Calculator
Calculate a pitcher's Earned Run Average from earned runs allowed and innings pitched.
Earned Run Average
3.15
Earned Runs per Inning0.350
Earned Run Average vs Earned Runs Allowed
Earned Run Average (ERA)
ERA is the average number of earned runs a pitcher allows per nine innings. It is the most traditional measure of pitching effectiveness.
Formula
ERA = (Earned Runs / Innings Pitched) x 9
Only earned runs count (errors by fielders are excluded). A lower ERA is better. In modern MLB, an ERA below 3.00 is excellent, 3.00-4.00 is above average, and above 5.00 is poor.
Example Calculation
A pitcher allows 35 earned runs in 100 innings.
- 01ERA = (35 / 100) x 9 = 0.35 x 9 = 3.15
- 02This is an above-average ERA in modern baseball
Frequently Asked Questions
Learn More
Understanding Batting Average - A Complete Guide to Baseball's Key Stat
Learn how batting average is calculated, what makes a good average, and how it compares to modern baseball statistics like OBP and OPS.