1. What is Earned Run Average (ERA)?

ERA is a statistic in baseball that measures a pitcher's effectiveness, calculated as the average number of earned runs allowed per nine innings pitched. It's one of the most important metrics for evaluating pitcher performance.

2. How Does the Calculator Work?

The calculator uses the standard ERA formula:

Where:

• Earned Runs — Runs scored without benefit of errors
• Innings Pitched — Number of innings the pitcher has completed (can include fractions like 6.2)
• 9 — Represents a standard 9-inning game

Explanation: The formula scales the earned runs to a standard 9-inning game to allow comparison between pitchers regardless of how many innings they've pitched.

3. Importance of ERA in Baseball

Details: ERA is crucial for evaluating pitcher performance, comparing pitchers across different games and seasons, and making strategic decisions about pitcher usage.

4. Using the Calculator

Tips: Enter the total earned runs allowed and innings pitched. Innings can include fractions (e.g., 6.2 means 6 innings and 2 outs).

5. Frequently Asked Questions (FAQ)

Q1: What's considered a good ERA?
A: In modern MLB, below 4.00 is generally good, below 3.00 is excellent, and below 2.00 is exceptional.

Q2: How does ERA differ from WHIP?
A: WHIP (Walks + Hits per Inning Pitched) measures baserunners allowed, while ERA measures runs scored.

Q3: Why multiply by 9 in the formula?
A: This standardizes the statistic to a full 9-inning game, allowing comparison between starters and relievers.

Q4: What's the difference between earned and unearned runs?
A: Earned runs are those that score without defensive errors, while unearned runs result from defensive mistakes.

Q5: Does ERA account for ballpark factors?
A: No, ERA is a raw statistic. ERA+ adjusts for ballpark and league factors for better comparisons.