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ERA Calculator
Calculate a pitcher’s Earned Run Average
About ERA
Earned Run Average (ERA) is a statistic in baseball that measures a pitcher’s effectiveness. It represents the average number of earned runs a pitcher allows per nine innings pitched.
Formula: ERA = (Earned Runs × 9) ÷ Innings Pitched
ERA Scale Reference
- Excellent: Below 2.00
- Good: 2.00-3.50
- Average: 3.50-4.50
- Poor: Above 4.50
ERA Calculator: Measure Pitching Performance
Table of Contents
- What is ERA in Baseball?
- Why is ERA Important?
- How to Calculate ERA
- Features of Our ERA Calculator
- How to Use the ERA Calculator
- Understanding ERA Results
- Advanced ERA Statistics
- Common ERA Questions (FAQs)
- Trust & Accuracy
What is ERA in Baseball
Earned Run Average (ERA) is one of the most important statistics in baseball to evaluate a pitcher’s effectiveness. It measures the average number of earned runs a pitcher allows per nine innings pitched.
- Earned Runs: Runs scored without errors or passed balls
- Innings Pitched (IP): Total innings a pitcher has played
A lower ERA indicates a better pitcher, while a higher ERA suggests weaker performance.
Example:
- A pitcher with a 2.50 ERA is excellent
- A pitcher with a 5.00 ERA is struggling
Why is ERA Important?
ERA helps:
1. Compare pitchers across teams and seasons
2. Evaluate performance objectively (not affected by team offense)
3. Make strategic decisions (bullpen management, player trades)
ERA vs. Other Pitching Stats
| Stat | What It Measures | Why ERA is Better |
|---|---|---|
| Win-Loss Record | Games won/lost | Doesn’t account for team support |
| WHIP | Walks + Hits per IP | Doesn’t measure run prevention |
| Strikeouts (K/9) | Strikeouts per 9 IP | Doesn’t show run impact |
| ERA | Earned runs per 9 IP | Best overall performance metric |
How to Calculate ERA
The ERA formula is simple:ERA=Earned Runs×9Innings PitchedERA=Innings PitchedEarned Runs×9
Example Calculation:
- Earned Runs Allowed: 4
- Innings Pitched: 6.2 (6⅔ innings)
ERA=4×96.67=5.40ERA=6.674×9=5.40
This means the pitcher allows 5.40 earned runs per 9 innings.
Features of Our ERA Calculator
Our free online ERA calculator provides:
1. Instant Results – No manual math needed
2. Decimal Innings Support – Enter 5.1 (5⅓) or 6.2 (6⅔)
3. Visual ERA Scale – See how your ERA compares to MLB standards
4. Mobile-Friendly – Works on phones, tablets, and desktops
5. No Login Required – Use it anytime, no data tracking
How to Use the ERA Calculator
- Enter Earned Runs Allowed (e.g., 3)
- Input Innings Pitched (e.g., 7.1 for 7⅓ innings)
- Click “Calculate ERA”
- See Results – ERA value + performance rating
Example Input:
| Input | Value |
|---|---|
| Earned Runs | 2 |
| Innings Pitched | 6.0 |
| Calculated ERA | 3.00 |
Understanding ERA Results
Our calculator also shows how your ERA compares to professional standards:
1. Excellent ERA: Below 2.50 (Elite pitchers)
2. Good ERA: 2.50–3.50 (Solid MLB starter)
3. Average ERA: 3.50–4.50 (Back-end rotation)
4. Poor ERA: Above 4.50 (Bullpen/struggling pitcher)
MLB ERA Leaders (2023 Example)
| Pitcher | ERA |
|---|---|
| 1. Jacob deGrom | 1.98 |
| 2. Shane McClanahan | 2.20 |
| 3. Justin Verlander | 2.75 |
Advanced ERA Statistics
For deeper analysis, consider:
1. ERA+ (Adjusted ERA)
- Compares ERA to league average (100 = average)
- Higher than 100 = better than average
2. FIP (Fielding Independent Pitching)
- Measures what ERA should be based on strikeouts, walks, and HRs
- Eliminates fielding impact
3. xERA (Expected ERA)
- Uses Statcast data to predict ERA based on contact quality
1. What’s a good ERA in MLB?
Under 3.00 = Ace pitcher
3.00–4.00 = Solid starter
Over 4.50 = Below average
2. What’s the lowest ERA in MLB history?
1.82 – Tim Keefe (1880) in the dead-ball era.
1.89 – Pedro Martinez (2000) in modern baseball
3. How do you calculate ERA for relief pitchers?
Same formula, but often over fewer innings.
Final Thoughts
Whether you’re a coach, player, or fan, understanding ERA helps you analyze pitching performance accurately.
