About ERA

Earned run average (ERA) is a metric that shows how many earned runs on average, a pitcher or team's pitcher, gives up over the course of nine innings. It is calculated by dividing earned runs by innings pitched then multiplying the result by 9. Generally, for ERA, lower is better. (Source)

Top Chicago Cubs Players by ERA

Which Chicago Cubs players rank highest in ERA? Below are the top ten by single season and by career totals with the team, requiring at least 50 innings pitched for a season record, or 100 innings pitched for a career record with the team.
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Chicago Cubs ERA Per Season

Chicago Cubs's ERA for each season of their history, plotted alongside yearly averages for MLB, the National League, and the National League Central.
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Chicago Cubs ERA Season Distribution vs. MLB and Peers

Each box summarizes ERA across all seasons, comparing the Chicago Cubs to MLB as a whole, the National League, and the National League Central. The box covers the middle 50% of seasons, the center line is the median, and the whiskers extend to the min and max values.
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Chicago Cubs ERA Year-Over-Year Change

A waterfall chart showing how the Chicago Cubs's ERA shifted season over season. Each bar represents the change from the previous year, making it easy to spot peak and decline phases.
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Chicago Cubs ERA — Season-by-Season Breakdown

Every season of Chicago Cubs's history with ERA alongside yearly averages for MLB, the National League, and the National League Central. Career totals include sum, average, minimum, maximum, and median.
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