What Is a Good ERA?

The most common mistake about ERA is treating it like a fixed scale where a 3.50 is always "good" and a 5.50 is always "bad." That is wrong. A 4.28 ERA was exactly average for an MLB starter in 2023. A 4.50 ERA in Coors Field that same year was better than average. A 4.00 ERA in 1968 was terrible. The only honest answer to "what is a good era" is: compare it to the league average for that season and that level of play. Everything else is invented.

You get the real numbers for MLB, college, and high school below, plus the adjustments you need to make for ballpark, era, and sample size. You will learn why a reliever with a 4.80 ERA might be pitching better than the starter with a 4.10, and why a 2.00 ERA over 15 innings tells you almost nothing.

Compare the pitcher's ERA to the league average for that season and that level. If the ERA is below the league average, it is good. If it is above, it is not. That is the only universal rule.

For MLB starters, the 2024 league-average ERA was 4.21 (source: Baseball-Reference). A 3.80 ERA was about 10% better than average. A 4.50 was about 7% worse. For a high school pitcher, the league average might be 5.50 or 6.00 depending on the state and division. A 4.50 ERA in that context is excellent. The same number in MLB is slightly above average.

The failure case: using a single "good ERA" chart from a fantasy site or a generic guide. Those bands are not tied to any real league average and will mislead you. Ignore them.

Baseball-Reference publishes the league-average ERA for MLB starters each season. These are the numbers you need to judge an ERA against. The 2024 average was 4.21. For 2023 it was 4.28, for 2022 it was 4.07, and for 2021 it was 4.23. The 2020 average was 4.56, inflated by the shortened season.

Averages shift over time. The 1968 MLB average was 2.98. A 3.50 ERA that year was poor. A 3.50 ERA in 2023 was excellent. You cannot compare across eras without adjusting for the league average of each season.

For minor leagues, Baseball-Reference does not publish a single league-average figure. Use the major league average for the same season as a rough benchmark, but expect minor-league averages to be higher by about 0.50 to 1.00 runs due to lower quality of play and less consistent defense.

A reliever with a 4.50 ERA is not necessarily worse than a starter with a 4.00. Relievers enter games with inherited runners on base, and those runners count against the reliever's ERA even though they were put on base by the previous pitcher. This inflates reliever ERA by about 0.30 to 0.80 runs compared to a starter who begins a clean inning.

Relievers also pitch far fewer innings. The FanGraphs Library notes that reliever ERA is unreliable below 30 innings pitched. For a reliable estimate, you need 60 or more innings. A reliever with a 5.00 ERA over 25 innings could easily be a 3.50 pitcher over a full season. Use FIP (Fielding Independent Pitching) or SIERA (Skill-based Independent ERA) for relievers instead of raw ERA. These metrics remove the effect of defense and sample size.

The failure case: blaming a reliever for a high ERA when inherited runners and small sample size are the real cause. Always check innings pitched first.

The NCAA publishes team and individual ERA leaders by division. For 2024, the Division I leader was Oklahoma State with a team ERA of 1.84. Division II leader Rogers State had 1.97. Division III leader Salisbury had 1.69. These are elite numbers, not averages. The typical good college ERA is higher.

A good ERA in college baseball depends on the division and the conference. For a Division I starter, a 3.00 to 3.50 ERA is strong. For Division II or III, a 3.50 to 4.50 is solid. The NCAA does not publish a league-average ERA for each division, so use the leader's ERA as a reference point: if the leader is at 1.84, then 2.50 is excellent, 3.50 is good, and 4.50 is average or below.

College softball uses a 7-inning game, not 9. The NCAA Statistics Manual defines softball ERA as (earned runs / innings pitched) × 7. A 2.00 ERA in softball is not comparable to a 2.00 ERA in baseball. Adjust for game length before comparing.

High school ERA has no authoritative national standard. MaxPreps does not publish systematic ERA data. State associations vary in how they score earned runs, and many high school scorekeepers use different rules than MLB. The NFHS rules for baseball and softball do not define ERA as an official statistic.

Given these gaps, treat any high school ERA number as rough. A good ERA for a high school pitcher might be 4.00 to 5.00 in a competitive state, or 5.00 to 6.00 in a weaker league. There is no reliable national source to give you a precise band. If you are evaluating a high school pitcher, compare their ERA to the average of pitchers in their own league for the same season, not to an MLB or college chart.

The failure case: applying MLB "good" bands (3.00-4.00) to a high school pitcher and concluding they are elite. They might be, but you cannot know without the league average.

ERA varies by ballpark because of altitude, wind, and stadium geometry. A 4.00 ERA in Coors Field (high altitude, inflates ERA by about 0.50 to 1.00 runs) is much better than a 4.00 ERA in a neutral park. To compare pitchers across parks and eras, use ERA+ and ERA-.

ERA+ adjusts raw ERA for the ballpark's park factor and normalizes to a scale where 100 is league average. A pitcher with an ERA+ of 110 is 10% better than average. ERA- is the inverse: lower is better, with 100 as average. Both are published by FanGraphs and are the only honest way to compare a 2023 pitcher in Arizona to a 1973 pitcher in Los Angeles.

The failure case: ignoring park factor when evaluating a pitcher who plays half their games at a high-altitude or windy park. Their raw ERA will be higher than their skill level. Use ERA+ or ERA- to correct for it.

The best single-season ERA in MLB history belongs to a handful of pitchers. Baseball-Reference lists the top single-season ERAs as under 1.50 for pitchers with at least 150 innings. The career leader, with a minimum of 1,000 innings pitched, is also under 1.50. These are historically dominant performances, not targets for normal evaluation.

For comparison, the 2023 league average was 4.28. A 3.00 ERA that season was excellent. A 2.00 ERA was elite. A 1.50 ERA was historically great. Do not use the best-ever numbers as your standard for "good." Use the league average for that season.