All-Star / Ace Quality (2.50–3.49 ERA)
Walks + Hits per Inning Pitched
K/BB: 4 strikeout-to-walk
Pitcher has an ERA of 3.44 over 65.1 innings pitched (25 earned runs allowed).
Earned Run Average, or ERA, shows how many earned runs a pitcher allows over a standard game length. Lower ERA values usually show stronger pitching.
ERA measures earned runs allowed by a pitcher. Baseball usually uses nine innings, while some levels use seven or six innings.
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Our ERA Calculator quickly calculates earned run average, WHIP, strikeout rate, and strikeout-to-walk ratio. Enter your pitching numbers and choose the game length.
Enter earned runs, innings pitched, hits allowed, walks, and strikeouts.
Select the game format for accurate pitching calculations.
Get your ERA, WHIP, K/9, and K/BB ratio instantly.
Enter earned runs, innings pitched, hits allowed, walks, and strikeouts.
Select the game format for accurate pitching calculations.
Get your ERA, WHIP, K/9, and K/BB ratio instantly.
You can calculate ERA with earned runs, innings pitched, and the game's standard innings. The formula changes when the game length changes.
Use the game's earned runs and innings pitched. For standard nine-inning baseball, multiply earned runs by 9, then divide by innings pitched.
Formula
For a nine-inning game:
Step by step guide
Practical Example
A pitcher allows 2 earned runs across 6 innings in a nine-inning game.
The pitcher's ERA is 3.00.
For several games, combine earned runs and innings pitched before calculating ERA. Do not average each game's ERA values directly.
Formula
Step by step guide
Practical Example
A pitcher allows 10 earned runs across 30 innings.
The pitcher's combined ERA is 3.00.
Major League Baseball uses a nine-inning standard for ERA. MLB pitching leaders use earned runs and innings pitched to rank pitcher performance.
A baseball field affects pitching conditions through dimensions, fences, and local factors. Ballparks can influence runs and ERA.
A baseball bat affects offensive results, but ERA measures pitching results. A pitcher still faces different hitters, bats, and ballpark conditions.
MLB ERA leaders record some of the lowest earned run averages during a season. In 2025, Paul Skenes led MLB at 1.97.
Rank | Pitcher | Team | 2025 ERA |
|---|---|---|---|
1 | Tarik Skubal | Detroit Tigers | 2.21 |
2 | Hunter Brown | Houston Astros | 2.43 |
3 | Garrett Crochet | Boston Red Sox | 2.59 |
4 | Max Fried | New York Yankees | 2.86 |
5 | Bryan Woo | Seattle Mariners | 2.94 |
Note: Tarik Skubal won the 2025 American League ERA title with a 2.21 ERA.
ERA gives fans, coaches, and teams a simple way to judge a pitcher's run prevention.
ERA shows how many earned runs a pitcher allows over a standard game length. A lower number usually means better run prevention.
ERA helps compare pitchers within the same league and season. League, ballpark, defense, and run scoring can affect those comparisons.
ERA helps baseball fans compare famous pitching seasons across different periods. Historical context matters because baseball rules and scoring conditions changed.
Teams use ERA alongside other statistics when evaluating pitchers. Awards such as the Cy Young Award also consider broader pitching performance.
ERA works best with other pitching statistics. Each metric shows a different part of a pitcher's performance.
WHIP measures walks and hits allowed per inning. A lower WHIP usually means a pitcher allows fewer baserunners.
K/9 shows how many batters a pitcher strikes out across nine innings. Higher K/9 values often show strong strikeout ability.
K/BB compares strikeouts with walks. A higher ratio usually shows better control and strikeout ability.
ERA+ compares ERA with the league average and adjusts for ballpark effects. A score above 100 means better than league average.
FIP estimates pitching results using home runs, walks, hit batters, and strikeouts. It reduces the effect of defense behind the pitcher.
Statistic | What It Measures | Main Use |
|---|---|---|
ERA | Earned runs allowed | Measures actual run prevention |
xERA | Expected ERA based on quality of contact | Estimates expected run results |
WHIP | Walks and hits per inning | Measures baserunner prevention |
FIP | Home runs, walks, hit batters, and strikeouts | Focuses on defense independent events |
SIERA | Skill Interactive ERA | Estimates pitcher skill using strikeouts and batted balls |
ERA measures actual earned runs. FIP focuses on key events a pitcher controls, while xERA and SIERA estimate expected performance.
ERA does not show every part of pitching skill. Defense, ballpark, league, scoring conditions, and sample size can affect the number. Use ERA with WHIP, FIP, and ERA+ for better context.
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These answers explain good ERA values, earned runs, partial innings, ERA records, and related pitching statistics.