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ERA Calculator

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ERA Calculator

Earned Run Average for Baseball Pitchers

e.g. 5.1 = 5⅓, 5.2 = 5⅔
ERA:0.15
Elite (MLB Top 10%)
MLB Average
Your Performance

Calculate baseball pitcher’s Earned Run Average (ERA) instantly with our advanced tool. Compare with MLB averages, visualize performance trends, and optimize training strategies.

What is ERA?

A core baseball statistic measuring a pitcher’s effectiveness by calculating earned runs allowed per 9 innings pitched. Recognized globally as the gold standard for pitcher evaluation.

Key Formula

ERA = (Earned Runs × 9) ÷ Innings Pitched

Variables:

  • Earned Runs: Runs not caused by fielding errors
  • Innings Pitched: Counts outs (0.1 IP = 1 out, 0.2 IP = 2 outs)

How to Use

  1. Input Data

    • Enter total earned runs (integer)
    • Input innings pitched (e.g. 5.1 = 5⅓ innings)

  2. Interpret Results

    • ERA value (e.g. 3.25)
    • Performance tier indicator:
      • <2.50 : Elite (MLB top 10%)
      • 2.51-3.50 : Competitive
      • 3.51-4.50 : Average

  3. Advanced Features

    • Historical MLB average comparison chart
    • Mobile-responsive design
    • Exportable calculation reports

FAQs

Q: How is ERA different from RA?
A: ERA excludes unearned runs from fielding errors, while Run Average (RA) counts all runs.

Q: What’s a good ERA in modern baseball?
A: As of 2025, the MLB average ERA is 4.18. Sub-3.50 is considered excellent.

Q: Can I calculate ERA for partial seasons?
A: Yes, the calculator works for any inning sample size, though smaller samples may lack statistical significance.

Terminology

  • WHIP: Walks + Hits per Inning Pitched
  • FIP: Fielding Independent Pitching
  • QS: Quality Start (≥6 IP, ≤3 ER)
  • K/9: Strikeouts per 9 innings
  • BABIP: Batting Average on Balls In Play
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