Explainers
FIP vs ERA: Which Pitching Stat Should You Trust?
Compare FIP and ERA in baseball, learn what each captures, and see when to trust peripherals over traditional earned run average.
Two views of the same pitcher
ERA describes what happened with a pitcher’s run prevention after defense and sequencing. FIP focuses on outcomes a pitcher influences most directly: strikeouts, walks, hit batters, and home runs.
When ERA and FIP diverge, ask whether the gap comes from defensive support, timing of hits, or a true change in the pitcher’s underlying skills.
A practical midseason checklist
If a starter’s ERA is far better than FIP, dig into batting average on balls in play and home-run rates before projecting the second half. If FIP is better than ERA, the pitcher may be due for improved luck—or may simply pitch in a tough park and defense.
Cross-check Ballrecord innings, strikeouts, walks, and home runs allowed on the pitcher page, then compare against league pitching leaders for the same season.
Frequently asked questions
- Is FIP better than ERA?
- Neither replaces the other. ERA is the traditional results number; FIP is a skill-leaning companion for forecasting and context.
- Do relievers need a different lens?
- Yes. Small samples swing both ERA and FIP hard. Emphasize contact quality, chase rates, and role leverage for bullpen arms.
Continue in the record
Related notebook entries
- ERA Explained: How Earned Run Average WorksA practical explanation of ERA in baseball, how earned runs are calculated, and why innings pitched qualification matters on leaderboards.
- Quality Start vs Complete Game: Pitching Milestones ComparedCompare quality starts and complete games in MLB, why complete games became rare, and how to evaluate starters in bullpen eras.
- Innings Pitched Notation: Why .1 and .2 Mean OutsLearn how baseball innings pitched notation works, why .1 and .2 represent outs, and how Ballrecord displays pitcher workloads.
- WHIP Explained: Walks Plus Hits Per Inning PitchedUnderstand WHIP in baseball, how it measures baserunner traffic, and how to pair it with ERA when evaluating pitchers.