FIP Calculator
Calculate Fielding Independent Pitching (FIP) from home runs, walks, hit batters, strikeouts and innings.
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What this tool does
Calculate Fielding Independent Pitching (FIP) from home runs, walks, hit batters, strikeouts and innings. The FIP constant changes every season (FanGraphs publishes it with its league pitching data). Enter the constant for the season you are analysing; 3.10 matches recent MLB seasons. FIP ignores balls in play by design.
How to use the FIP Calculator
- Enter or select home runs allowed.
- Enter or select walks allowed.
- Enter or select hit batters.
- Enter or select strikeouts.
- Enter or select whole innings pitched.
- Enter or select additional outs (0, 1 or 2).
- Enter or select fip constant (season-specific — fangraphs published value; 3.10 is the recent-seasons default).
- Read the calculated result; change any measurement to compare alternatives.
Formula
FIP = (13×HR + 3×(BB + HBP) − 2×K) ÷ innings pitched + FIP constant. The constant is published by FanGraphs for each season so that league FIP equals league ERA
- hr
- Home runs allowed
- bb
- Walks allowed
- hbp
- Hit batters
- k
- Strikeouts
- innings
- Whole innings pitched
- outs
- Additional outs (0, 1 or 2)
- constant
- FIP constant (season-specific — FanGraphs published value; 3.10 is the recent-seasons default)
The FIP constant changes every season (FanGraphs publishes it with its league pitching data). Enter the constant for the season you are analysing; 3.10 matches recent MLB seasons. FIP ignores balls in play by design.
Worked example
For fip calculator, the following measurements illustrate the exact method: Home runs allowed: 20; Walks allowed: 50; Hit batters: 5; Strikeouts: 180; Whole innings pitched: 180; Additional outs (0, 1 or 2): 0; FIP constant (season-specific — FanGraphs published value; 3.10 is the recent-seasons default): 3.1.
Inputs
- Home runs allowed20
- Walks allowed50
- Hit batters5
- Strikeouts180
- Whole innings pitched180
- Additional outs (0, 1 or 2)0
- FIP constant (season-specific — FanGraphs published value; 3.10 is the recent-seasons default)3.1
Result
- FIP3.46
- Innings pitched180
Results explained
- FIP
- FIP from the formula above. The FIP constant changes every season (FanGraphs publishes it with its league pitching data). Enter the constant for the season you are analysing; 3.10 matches recent MLB seasons. FIP ignores balls in play by design.
- Innings pitched
- Innings pitched from the formula above. The FIP constant changes every season (FanGraphs publishes it with its league pitching data). Enter the constant for the season you are analysing; 3.10 matches recent MLB seasons. FIP ignores balls in play by design.
Frequently asked questions
FIP is scaled to look like ERA, so the same reading applies: around 4.00 is league average in recent seasons, 3.50 is strong, 3.00 is ace level, and 5.00+ is replacement-level territory.
The constant is chosen so the league-average FIP equals the league-average ERA for that season. When league offence rises or falls, FanGraphs republishes the constant — using last year's constant shifts every FIP slightly.
Research shows pitchers control strikeouts, walks and home runs far more than whether balls in play become hits, which depends heavily on defence and luck. FIP keeps only the outcomes a pitcher mostly owns.
The pitcher likely suffered from poor defence, bad sequencing luck or a weak bullpen behind them, and is a candidate to improve. A much higher FIP than ERA suggests the opposite — good fortune that may not last.
In the standard FanGraphs version, walks in the formula are unintentional plus hit batters handled separately; many simple calculators use total walks, which slightly raises FIP. Check which convention a comparison source uses.