The ERA Calculator is a fast, reliable tool to help baseball players, coaches, and fans evaluate pitching performance. ERA, or Earned Run Average, is one of the most common stats used to assess a pitcher’s effectiveness over time.
Whether you’re tracking your own stats, coaching a youth league, or analyzing major league trends, this tool gives you a quick read on performance and where it stands compared to common benchmarks.
What Is ERA?
ERA stands for Earned Run Average. It represents the number of earned runs a pitcher allows per nine innings pitched. The formula is simple:
ERA = (Earned Runs × 9) ÷ Innings Pitched
An ERA of 3.00 means a pitcher gives up 3 earned runs every 9 innings. Lower is better.
How to Use the ERA Calculator
Enter Earned Runs Allowed – Total runs scored against the pitcher, not counting unearned runs caused by errors.
Enter Innings Pitched – Total innings the pitcher has thrown. Use decimals to account for partial innings (e.g., 6.2 for 6⅔ innings).
Optional: Enter Games Played – This helps calculate average earned runs per game.
Click “Calculate ERA” to instantly see:
ERA
Earned Runs/Game
Performance Rating (Elite, Excellent, Good, etc.)
The tool also generates a chart and reference table comparing your ERA to typical MLB ranges.
ERA Ratings Guide
| ERA Range | Rating | Description |
|---|---|---|
| 0.00–1.99 | Elite | Cy Young contender, dominant arm |
| 2.00–2.99 | Excellent | All-Star level |
| 3.00–3.99 | Good | Solid starting pitcher |
| 4.00–4.99 | Average | Back-end rotation or reliever |
| 5.00–5.99 | Below Avg | Needs improvement |
| 6.00+ | Poor | Struggling, below league average |
Why ERA Matters
ERA is widely used because it normalizes performance over nine innings, making comparisons across players and seasons easier. However, it doesn’t tell the full story. Ballparks, defense, and scoring rules can affect ERA, so use it alongside other stats like WHIP and strikeout rate.
Final Thoughts
The ERA Calculator is a simple yet effective way to track and understand pitching stats. Whether you’re just learning baseball analytics or need a tool to analyze your pitching rotation, this calculator gives you a quick, visual summary of performance.
Use it regularly to track improvement, spot trends, or scout competition.
ERA Calculator
Pitching Statistics
Pitching Analysis
| ERA Range | Rating | Description |
|---|
Note: ERA = (Earned Runs × 9) ÷ Innings Pitched. Lower values indicate better performance. MLB average ERA typically ranges between 3.50-4.50. Context matters - ballpark factors, league averages, and team defense affect ERA.