ERA is one of the first numbers you see next to a pitcher’s name, and one of the most important stats in baseball. But what actually counts as a “good” ERA? A 3.50 might be excellent for one pitcher and merely average for another, because the answer depends on the era, the level of play, and whether you are talking about a starter or a reliever. So what is a good ERA in baseball, and how should you read the number?
Here is a clear breakdown of ERA benchmarks at every level, how the stat is calculated, and how the “good” line has shifted across baseball history.
The chart below shows what counts as a good ERA at each level. Take a look, then we’ll explain it.
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What Is a Good ERA in Baseball?
For a Major League starting pitcher, the general benchmarks are clear: an ERA under 3.00 is elite and puts a pitcher in Cy Young contention, 3.00 to 4.00 is good and marks a reliable starter, 4.00 to 5.00 is roughly league average, and anything above 5.00 signals a pitcher who is struggling and may lose his rotation spot. The league-average ERA has hovered around 4.00 to 4.50 in recent years (about 4.10 since 2010), so a 3.50 ERA represents a genuinely good season for most pitchers. The key thing to remember is that “lower is always better,” ERA works like a golf score, where a smaller number reflects better performance.
How ERA Is Calculated
ERA stands for Earned Run Average, and it measures how many earned runs a pitcher allows per nine innings pitched. The formula is straightforward: ERA = 9 x earned runs / innings pitched. So if a pitcher throws a complete nine-inning game and gives up two earned runs, his ERA for that outing is 2.00.
The word “earned” matters: runs that score because of a fielding error or passed ball are “unearned” and do not count against the pitcher’s ERA, since they were not his fault. One small note for anyone calculating it by hand, fractional innings are written as decimals (.1 means one-third of an inning, .2 means two-thirds), so they must be converted to .333 and .667 for an accurate result.
Good ERA by Level: Starters vs Relievers
A good ERA depends heavily on the level and the role. Relief pitchers are held to a higher standard than starters, because they throw fewer innings, often enter in favorable situations, and rarely face a lineup more than once.
A good MLB reliever ERA is under 3.00, and elite closers regularly post ERAs under 2.00. Outside the majors, the benchmarks shift by competition level: in college baseball, an ERA around 3.50 to 4.50 is considered good (with under 3.00 being elite), partly because BBCOR metal bats boost offense. For high school, a good ERA falls between roughly 2.00 and 4.00, with under 2.00 being truly dominant, though high school numbers vary widely depending on the strength of competition faced.
Why a “Good” ERA Changes Over Time
What counts as a good ERA has shifted dramatically across baseball history, because the balance between pitching and hitting is always changing. In the Dead Ball Era, pitchers dominated: the league-wide ERA was just 2.37 in 1908, so a 3.00 back then was merely ordinary.
By 1938 the average had climbed to 4.30 as hitting surged. Then came 1968, the famous “Year of the Pitcher,” when the average ERA fell back to 2.98, so low that the league lowered the pitcher’s mound the following year to help hitters. Across more than 150 years, the all-time MLB average sits around 3.89, but it has been closer to 4.10 since 2010. The takeaway: always judge an ERA against the era it was earned in.
What Else Affects ERA
ERA is the most commonly cited pitching stat, but it does not tell the whole story, and several factors outside a pitcher’s control can skew it. Defense is a big one: a pitcher backed by a strong fielding team will post a better ERA than one whose teammates misplay balls, since plays that should be outs can extend innings and let runs score.
Ballpark matters too, some stadiums are far more favorable to hitters, inflating ERAs through no fault of the pitcher. MLB also adjusts the competitive balance over time through rule changes, such as the recent crackdown on pitchers using illegal sticky substances to improve their grip and spin. Because of these factors, savvy fans pair ERA with stats like WHIP and FIP for a fuller picture.
Notable ERA Records and Marks
A few ERA numbers stand out in the record books. In 2025, Paul Skenes led all of MLB with a 1.97 ERA, exactly the kind of sub-2.00 season that defines an ace at the top of the game. Looking at the history books, Ed Walsh holds the all-time career ERA record at a remarkable 1.82, set during the pitcher-friendly Dead Ball Era.
ERA itself was first officially tabulated by the National League in 1912, and statistician Henry Chadwick is generally credited with developing the concept. These marks help frame just how good a modern sub-2.00 season really is, and why ERA remains one of baseball’s most enduring measuring sticks. For a closely related stat, see our explainer on what WHIP is in baseball.
The Bottom Line
A good ERA in baseball depends on context, but the simple guide for MLB starters is: under 3.00 is elite, 3.00 to 4.00 is good, 4.00 to 5.00 is average, and over 5.00 is a problem. Relievers are held to a tougher standard, while college and high school benchmarks run differently because of bats and competition.
The “good” line also shifts with the era, a 3.00 ERA was ordinary in the Dead Ball days but excellent now. Use ERA as a quick, reliable snapshot of a pitcher’s run prevention, but remember to weigh it alongside the level, the role, the ballpark, and stats like WHIP for the complete picture.