ERA Calculator (Baseball)

Calculate earned run average from earned runs and innings pitched.

ERA

3.86

Rating

Average

Pitching Stats

Innings Pitched7.0
Earned Runs3
ERA3.86

Use the ERA Calculator (Baseball) above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

This calculator helps you determine a pitcher's Earned Run Average (ERA), a crucial statistic in baseball that reflects their effectiveness. A lower ERA indicates a better pitcher, as it represents the average number of earned runs allowed per nine innings pitched. For the 2026 MLB season, top pitchers are projected to maintain ERAs below 3.00, with elite relievers aiming for sub-2.00 figures.

The Earned Run Average (ERA) is calculated using a straightforward formula: (Earned Runs / Innings Pitched) * 9. 'Earned Runs' are runs scored against a pitcher that are not due to fielding errors. 'Innings Pitched' refers to the total number of innings a pitcher has completed, including fractions (e.g., 5.1 innings is 5 and 1/3 innings).

When using this calculator, ensure you differentiate between 'runs' and 'earned runs' – only earned runs count towards ERA. A common mistake is to include unearned runs, which can artificially inflate a pitcher's ERA. Remember that ERA is a rate statistic, so a small sample size of innings pitched can lead to a highly volatile and less representative ERA.

Example: Blake Snell's 2026 Projected ERA

  1. 1 Blake Snell is projected to pitch 175.0 innings in the 2026 season and is expected to give up 50 earned runs.
  2. 2 Using the formula: (50 Earned Runs / 175.0 Innings Pitched) * 9. This calculates to (0.2857) * 9.
  3. 3 Blake Snell's projected ERA for the 2026 season would be 2.57.
  4. 4 This projected ERA of 2.57 would place Blake Snell among the top tier of starting pitchers in the 2026 MLB season, indicating a highly effective performance. For comparison, the league average ERA for starting pitchers in 2025 was around 4.20.

Source: ACE · Last updated: April 2026

Frequently Asked Questions

What is a good ERA in baseball?
An ERA under 3.00 is excellent, 3.00-3.50 is very good, 3.50-4.00 is above average, and above 4.50 is below average for MLB starters. Relief pitchers typically have lower ERAs than starters.
How do you calculate ERA?
ERA equals (earned runs / innings pitched) x 9. For example, a pitcher who allows 30 earned runs over 180 innings has an ERA of 1.50 (30/180 x 9).
What does earned run mean in ERA?
An earned run is any run that scores without the aid of a fielding error or passed ball. Unearned runs (scored due to errors) do not count against a pitcher's ERA.

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