ERA Table: Earned run average by Earned runs allowed
Reference table of earned run average for ERA across a range of earned runs allowed values — exact, engine-computed figures you can read off at a glance.
ERA Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Earned run average
1.50
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the ERA Calculator
The ERA Calculator works out your earned run average in an instant. Enter earned runs allowed and innings pitched and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the earned runs allowed.
- Enter the innings pitched.
- Read off your earned run average — the calculator updates automatically, with no button to press.
Formula
The ERA Calculator uses the formula:
Earned run average = Earned runs allowed × 9 ÷ Innings pitched
Worked example
For example, with earned runs allowed of 30 and innings pitched of 180, the earned run average is 1.50.
| Earned runs allowed | 30 |
|---|---|
| Innings pitched | 180 |
| Earned run average | 1.50 |
|---|
Results are estimates for educational use, not professional advice.
Key terms explained
- Mean
- The average of a set of numbers — their sum divided by how many there are.
Frequently asked questions
Multiply earned runs by 9, then divide by innings pitched. 30 earned runs over 180 innings is an ERA of 1.50.
ERA expresses earned runs per nine innings, the length of a standard game, so pitchers can be compared on an even basis.
An ERA under 3.00 is excellent, around 4.00 is average, and above 5.00 is poor in professional baseball.
An earned run is one charged to the pitcher without the help of fielding errors or passed balls, so it reflects the pitcher's own performance.
Enter the earned runs allowed. Enter the innings pitched. Read off your earned run average — the calculator updates automatically, with no button to press.
Related guides
How to Calculate ERA: Formula, Steps & Examples
Learn how to calculate ERA — the formula explained step by step, with worked examples and a free calculator to check your answer.