FIP Calculator
Calculate Fielding Independent Pitching (FIP) for baseball pitchers with visual performance scale, step-by-step formula breakdown, and MLB benchmarks.
What is Fielding Independent Pitching (FIP)?
Fielding Independent Pitching (FIP) is a sabermetric statistic that measures a pitcher's effectiveness by focusing on outcomes they directly control: home runs, walks, hit-by-pitches, and strikeouts. Unlike ERA, FIP removes the influence of defense, luck, and ballpark factors to provide a clearer picture of a pitcher's true skill level.
Developed by Tom Tango, FIP uses a linear weights approach to convert these events into a run-equivalent scale that mirrors ERA. This makes FIP more predictive than ERA for future performance, as it isolates the pitcher's contributions from team defense.
FIP Formula
The standard FIP formula is:
$$\text{FIP} = \frac{(13 \times HR) + (3 \times (BB - IBB + HBP)) - (2 \times SO)}{IP} + C$$Where:
- HR = Home runs allowed
- BB = Walks (bases on balls)
- IBB = Intentional walks
- HBP = Hit by pitches
- SO = Strikeouts
- IP = Innings pitched
- C = FIP constant (typically 3.10)
FIP Constant (C)
The FIP constant is used to scale FIP to the same level as league-average ERA. It is calculated as:
$$C = \text{lgERA} - \frac{(13 \times \text{lgHR}) + (3 \times (\text{lgBB} - \text{lgIBB} + \text{lgHBP})) - (2 \times \text{lgSO})}{\text{lgIP}}$$where lg prefix indicates league-wide totals. For MLB, this constant typically falls between 3.00 and 3.20. The most commonly used value is 3.10, but the constant varies slightly by season and league. Our calculator allows you to use the default 3.10 or enter a custom value for your specific league/season.
FIP Rating Scale
| Rating | FIP Range (vs C) | Description |
|---|---|---|
| Excellent | ≤ C - 1.50 | Elite run-prevention; Cy Young caliber |
| Great | C - 1.50 to C - 0.70 | Well above average; All-Star level |
| Average | C - 0.70 to C + 0.30 | League-average performance |
| Below Average | C + 0.30 to C + 1.20 | Below-average run prevention |
| Poor | > C + 1.20 | Well below average; replacement level |
How FIP Differs from ERA
ERA credits or debits a pitcher for what happens after the ball is put in play, which depends heavily on defense quality and ballpark. FIP only considers strikeouts, walks, hit-by-pitches, and home runs — events least affected by fielders. Studies show FIP predicts future ERA more accurately than past ERA does, making it valuable for forecasting and player evaluation.
For example, a groundball pitcher with a weak infield defense might have a 4.50 ERA but a 3.80 FIP, suggesting the defense is inflating their runs allowed. Conversely, a pitcher with a strong defense might have a lower ERA than FIP, signaling potential regression.
When FIP Is Less Useful
FIP works best over larger sample sizes (at least a full season). In small samples, extreme batted-ball profiles — such as knuckleballers or pitchers with exceptionally high or low groundball rates — can make FIP less reliable. For these cases, advanced variants like xFIP (which normalizes home run rates) or SIERA may be more appropriate.
Related Tools
Explore other baseball statistics with the ERA Calculator and Batting Average Calculator.
Frequently Asked Questions
What is Fielding Independent Pitching (FIP)?
FIP is a sabermetric statistic that evaluates a pitcher's effectiveness based only on outcomes they control: strikeouts, walks, hit-by-pitches, and home runs. It is scaled to match ERA, making it easy to interpret. A lower FIP means better performance.
What is a good FIP in MLB?
With the standard constant of 3.10, a FIP below 2.50 is considered elite (Cy Young caliber), between 2.50 and 3.10 is very good, between 3.10 and 3.80 is roughly average, and above 4.30 is below average. Context matters by season and league run environment.
Why is FIP better than ERA?
FIP removes defensive and luck factors from pitcher evaluation. ERA can be misleading when a pitcher has unusually good or bad defensive support. FIP isolates what the pitcher actually controls, making it more predictive of future performance than ERA.
Can FIP be lower than ERA?
Yes. When a pitcher's FIP is lower than their ERA, it suggests they have been unlucky or received poor defensive support. The difference between ERA and FIP is often called "FIP luck" — a large positive gap (ERA higher than FIP) typically signals future improvement.
How do I enter partial innings in baseball format?
Use the standard baseball notation: enter .1 for one out (1/3 inning) and .2 for two outs (2/3 inning). For example, 198.1 means 198 innings and 1 out, which equals 198.333 decimal innings. Our calculator handles this conversion automatically.
What is xFIP and how is it different?
xFIP (Expected FIP) replaces a pitcher's actual home run rate with the league-average home run rate per fly ball. This accounts for the fact that home run rates can fluctuate randomly. xFIP is considered more predictive than FIP in small samples but converges toward FIP over a full season.
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