Calculate Fielding Independent Pitching (FIP) from home runs allowed, walks, hit batters, strikeouts, innings pitched, and a constant.

Calculate FIP from observed pitching totals and a matching league constant.

FIP is on an ERA-like scale. It is not park adjusted and is not a complete measure of pitching skill.

Changing format reinterprets the innings number.

Use the constant for your league, season and data source.