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ERA

Calculate Earned Run Average (ERA = ER ÷ IP × 9). Bob Gibson 1.12, Dutch Leonard 0.96, Pedro 1.74. Start-by-start tracker, ERA+ estimate, elite benchmarks.

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🔥Pitching Stats

ERA Calculator

Compare to Gibson (1.12), Leonard (0.96), Pedro (1.74). ERA below 2.00 is elite. Start-by-start tracker included.

Baseball-ReferenceFanGraphs

Legendary Seasons

Best for: Fantasy baseball, comparing to Gibson/Pedro/deGrom, start-by-start tracking, partial innings (6.1, 6.2).

Start-by-Start Tracker

era_result.txt●
$ era --er 20 --ip 150
ERA: 1.20
ER: 20
IP: 150
ERA+: 334
ER/Start: 0.77
ERA = (Earned Runs ÷ IP) × 9 = (20 ÷ 150.3) × 9
ERA = 1.20
ERA+ approximation (vs 4.00 lg): 334
ER per start (est.): 0.77
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Summary

ERA 1.20 — Elite

📸 Screenshot Summary

1.20
20 ER / 150 IP
Your ERA

⚠️For educational and informational purposes only. Verify with a qualified professional.

Answer Capsule

ERA = (Earned Runs ÷ Innings Pitched) × 9. Use 6.1 for 6⅓, 6.2 for 6⅔. Under 2.00 is elite. Bob Gibson 1.12 in 1968; Dutch Leonard 0.96 in 1914.

Key Takeaways

  • ERA = (ER ÷ IP) × 9. Normalizes to 9 innings.
  • Use 6.1 for 6⅓, 6.2 for 6⅔, 7.0 for 7 full innings.
  • Under 2.00 is elite; league average is ~4.00.
  • Unearned runs do not count toward ERA.

Did You Know?

🔥 Bob Gibson posted 1.12 ERA in 1968—Year of the Pitcher—leading to the mound being lowered in 1969. (Baseball-Reference)
📜 Dutch Leonard holds the modern record with 0.96 ERA in 1914 for the Boston Braves. (SABR)
⚡ ERA below 2.00 is considered elite; only a handful of pitchers achieve it each season. (FanGraphs)
📅 1968 "Year of the Pitcher" saw Carl Yastrzemski win the AL batting title with .301—lowest ever. (MLB.com)
🏆 Pedro Martinez\'s 1.74 in 2000 came in the heart of the steroid era. (Baseball-Reference)
📊 ERA+ adjusts for ballpark and league; 100 is average, 150 means 50% better than league. (FanGraphs)

How It Works

Formula

ERA normalizes runs allowed to a 9-inning game. Partial innings: .1 = 1 out (⅓), .2 = 2 outs (⅔).

Earned vs Unearned

Only earned runs count; errors and passed balls create unearned runs. A pitcher with 5 runs allowed but 2 earned has 2.00 ERA over 9 IP.

1968 and the Mound

The "Year of the Pitcher" (1968) saw Bob Gibson post 1.12 ERA and Denny McLain win 31 games. The mound was lowered from 15 inches to 10 inches in 1969 to restore offense.

Expert Tips

Use the Start-by-Start tracker to see ERA trends over a season.
Compare to FIP for pitchers with poor defense behind them.
ERA+ and FIP give context beyond raw ERA.
Fantasy: sub-3.00 ERA is elite; target 150+ ERA+ for aces.

Comparison Table

ERALevelStatus
1.12Gibson 68✅
0.96Leonard 14✅
2Elite (<2)✅
4League Avg⚠️

Infographic Stats

1.12
Gibson 1968 (modern record)
0.96
Leonard 1914 (all-time)
<2.00
Elite threshold
1968
Mound lowered (15"→10")

Official Sources

Baseball-Reference

Comprehensive MLB pitching statistics and ERA leaders

Last updated: 2025-01

FanGraphs

Advanced pitching metrics including ERA+, FIP, xFIP

Last updated: 2025-01

MLB.com

Official Major League Baseball stats and standings

Last updated: 2025-01

Sample Calculation

Bob Gibson 1968: 38 ER in 304.2 IP.

ERA = (38 ÷ 304.2) × 9 = 1.12

Modern single-season record; mound lowered in 1969.

Quick Reference

ERA = (ER ÷ IP) × 9

  • • 0.96 — Dutch Leonard 1914 (all-time)
  • • 1.12 — Bob Gibson 1968 (modern)
  • • <2.00 — Elite
  • • ~4.00 — League average
  • • 6.1 = 6⅓ IP, 6.2 = 6⅔ IP

Disclaimer: For educational use. ERA+ is an approximation. Official stats from Baseball-Reference and FanGraphs.

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