⚾ ERA Calculator
Calculate Earned Run Average for Baseball Pitchers
Total earned runs allowed by the pitcher
Use decimal for partial innings: 7.1 means 7 innings + 1 out
Earned Run Average
📊 Calculation Steps
What is ERA?
ERA (Earned Run Average) is one of the most important statistics in baseball. It measures the average number of earned runs a pitcher allows per nine innings pitched.
📐 The ERA Formula
ERA = (Earned Runs × 9) / Innings Pitched
The multiplication by 9 standardizes the statistic to a nine-inning game.
🎯 What is a Good ERA?
Under 2.00: Excellent – Cy Young Award caliber
2.00 – 3.00: Very Good – All-Star level
3.00 – 4.00: Good – Solid rotation member
4.00 – 5.00: Below Average – Struggling
Above 5.00: Poor – Needs improvement
📝 Partial Innings Notation
One out = 0.1 (or 0.33 innings)
Two outs = 0.2 (or 0.67 innings)
Three outs = 1.0 (one complete inning)
Example: 7.1 innings = 7 innings plus 1 out
ℹ️ Earned vs Unearned Runs
Earned Runs: Result from the pitcher’s performance (hits, walks, etc.)
Unearned Runs: Result from defensive errors – not counted in ERA