Compute a pitcher’s Fielding Independent Pitching (FIP) from home runs, walks, hit batters, strikeouts and innings pitched.
FIP
How to use this tool
Home runs, walks, hit batters and strikeouts allowed.
Use .1 for one out and .2 for two outs.
Keep 3.10 or enter the season’s published FIP constant in advanced options.
A FIP well below ERA suggests bad luck or poor defence behind the pitcher, and vice versa.
Formula & worked example
10 HR, 20 BB, 2 HBP and 100 K in 100 innings with constant 3.10 gives FIP 3.06.
Limitations — read this before you rely on it
FIP credits/blames the pitcher only for HR, BB, HBP and K; it says nothing about balls in play, sequencing or park effects. The constant must match the league and season.
Frequently asked questions
Fielding Independent Pitching: what a pitcher’s ERA would look like with league-average defence and luck on balls in play.
Without it FIP would sit near zero; the constant scales it onto the familiar ERA scale for that league and season.
Use baseball notation: 6.1 means 6 innings and 1 out (6⅓), 6.2 means 6⅔. Never .3.
It is more stable and more predictive, but it ignores everything that happens on balls in play. Use both.
Yes for the formula, provided you use the same FIP constant for the season in question.