ERA-, FIP- , xFIP-

Last night I rolled out ERA-, FIP-, and xFIP- to the site. These are all park and league adjusted and basically your pitching equivalent of wRC+, except that lower is better, with 100 still being average.

You can read more about ERA- (or as it’s called in the article, aERA) here.

These are now available in all the player pages and leaderboards.

One other quick addition was adding Shutdowns (SD) and Meltdowns (MD) to the player pages.





David Appelman is the creator of FanGraphs.

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Azim Damani
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Azim Damani

What are the chief differences between ERA+ and ERA- or are they essentially the same thing?