MLB League Averages: 76 Seasons of Context
MLB league ERA, OPS, and strikeouts per nine innings for every season since 1950 — with where today's numbers stand historically. Every chart ends with where today stands against the full history.
Strikeouts per 9 innings
The defining trend of modern baseball: K/9 has more than doubled since 1950.
League ERA
From 1968's Year of the Pitcher (2.98) through the steroid-era peaks near 4.8 — the baseline behind every ERA+ figure.
League OPS
The league's offensive baseline by season — what OPS+ measures your hitter against.
Sources & method
League averages fetched from the sport’s reference-standard database (Baseball-Reference) league year-by-year tables. “Where today stands” lines are computed live from the full series — percentile of all seasons on record plus the long-run median. Seasons for NBA/NFL are keyed by starting year.
League-wide averages — team and player context varies. Updated after each season.
Frequently asked questions
Why is 1968 called the Year of the Pitcher?
League ERA fell to 2.98 — so extreme MLB lowered the mound the next season. It's why a 2.98 ERA meant 'exactly average' in 1968 but would be elite in 2000 (league 4.76). Our ERA+ calculator applies the right season automatically.
Are strikeouts really at historic highs?
Yes — K/9 has run above 8.5 since 2018 vs a 5.8 long-run median since 1950. The chart's context line updates as seasons finish.
What do ERA+ and OPS+ mean?
They index a player against that season's league average, where 100 = average — a 130 OPS+ means 30% better than the league that year. That's why they're the fairest cross-era stats, and why our calculators embed 76 seasons of league baselines.