Free FIP Calculator (Fielding Independent Pitching)

For over a century, Earned Run Average (ERA) was the gold standard for evaluating baseball pitchers. But what happens if a pitcher makes great pitches, but the defense behind them is terrible? Their ERA goes up, even though they pitched well.

To find a pitcher's true talent, modern baseball front offices and fantasy managers use FIP (Fielding Independent Pitching).

Our free FIP Calculator does the complex sabermetric math for you. Unlike generic calculators, our tool handles "baseball math" for innings pitched perfectly (automatically converting outs to decimals) and includes an adjustable FIP Constant so you can calculate stats for any season in MLB history.

Below the calculator, we break down exactly what FIP means in baseball, how the FIP formula works, and how to find the elusive FIP constant.

What is FIP in Baseball?

FIP stands for Fielding Independent Pitching. It is a modern sabermetric statistic that estimates what a pitcher's ERA should be, based solely on the outcomes they can actually control.

Because pitchers cannot control what happens once a ball is put into play (a line drive might go right into the shortstop's glove, or it might sneak through for a hit), FIP completely ignores balls in play. It focuses entirely on the "Three True Outcomes" of baseball:

1. Strikeouts (K)
2. Walks (BB) & Hit By Pitches (HBP)
3. Home Runs (HR)

If a pitcher has a high ERA but a low FIP, it usually means they have suffered from bad luck or terrible defense, and you can expect their ERA to improve in the future.

How to Calculate FIP (The Formula)

If you are looking for the exact fielding independent pitching formula, here is the equation developed by sabermetrician Tom Tango:

FIP = ( (13 × HR) + (3 × (BB + HBP)) - (2 × K) ) ÷ IP + FIP Constant

The Variables Explained:

• HR (Home Runs): Weighted heavily (x13) because they are automatic runs.
• BB + HBP (Walks & Hit By Pitches): Weighted moderately (x3) because they give the opponent free baserunners.
• K (Strikeouts): Deducted from the score (x -2) because they are the best outcome for a pitcher.
• IP (Innings Pitched): Remember, baseball uses thirds of an inning. If a pitcher pitches 5 innings and gets 1 out, they have pitched 5.1 innings in the scorebook, which is mathematically 5.333. (Our calculator handles this for you!)
• FIP Constant: A league-wide number added to the equation to ensure league-average FIP matches league-average ERA.

What is a FIP Constant?

The FIP constant is the most confusing part of the FIP calculation for beginners.

Because the FIP formula uses raw numbers (HR, BB, K) that don't naturally scale to match an ERA, statisticians add a "constant" to the end of the formula. This ensures that the league average FIP is on the exact same scale as the league average ERA (usually around 4.00 to 4.20).

FIP Constant by Year

The constant changes every single year because the league-wide run environment changes. For example, during the "Steroid Era," the constant was higher. In a pitcher-friendly year, it is lower.

• Typically, the MLB FIP constant hovers around 3.10 to 3.20.
• You can find the exact FIP constant for any historical season on stats websites like FanGraphs or Baseball-Reference.
• Tip: If you are calculating FIP for a current high school or college player, leaving the constant at 3.10 or 3.20 will give you a highly accurate estimate.

What is a Good FIP? (Benchmarks)

Because FIP is designed to mirror ERA, evaluating it is very simple. A good fielding independent pitching number looks exactly like a good ERA.

Here are the standard benchmarks for evaluating an MLB pitcher's FIP:

• Under 2.90: Elite / Cy Young Caliber.
• 2.90 - 3.20: Great / All-Star Level.
• 3.21 - 3.80: Above Average.
• 3.81 - 4.20: League Average (A solid rotational starter).
• 4.21 - 4.50: Below Average.
• Over 4.50: Poor / Struggling.

FIP vs. xFIP: What is the difference?

Once you master FIP, you will likely encounter the xFIP formula (Expected Fielding Independent Pitching).

xFIP is identical to FIP, with one major change: it replaces the pitcher's actual home runs allowed with the expected number of home runs allowed based on the league-average Home Run to Fly Ball ratio (HR/FB). xFIP is considered even more predictive than standard FIP because giving up home runs can sometimes be chalked up to a lucky gust of wind or a very small stadium.

Frequently Asked Questions (FAQs)

How is FIP calculated? FIP is calculated by multiplying Home Runs by 13, adding Walks and Hit-by-Pitches multiplied by 3, and subtracting Strikeouts multiplied by 2. That sum is divided by Innings Pitched, and finally, the league's FIP Constant is added to the result.

Is FIP more predictive than ERA? Yes, most baseball analysts agree that FIP is more predictive of future success than ERA. Because FIP removes the variables of defensive skill and "batted ball luck," it provides a truer measure of the pitcher's individual talent and performance.

How to find the FIP constant? The FIP constant changes every season. To find the exact FIP constant for a specific MLB season, you can visit the sabermetrics glossary on FanGraphs, which publishes the mathematically correct constant for every year in baseball history.

What is the lowest FIP in a season? The legendary Pedro Martinez holds the modern record for the lowest single-season FIP. In 1999, during the height of the high-scoring steroid era, Martinez posted an unbelievable 1.39 FIP with the Boston Red Sox.

What is a good FIP number? A good FIP number is anything under 3.80. A FIP under 3.20 is considered elite, while a FIP around 4.10 represents a league-average pitcher.

What is the Ohtani rule in baseball? The "Ohtani Rule" allows a team to list a starting pitcher as their Designated Hitter (DH) in the batting order. If the player is removed from the game as a pitcher, they can remain in the game to hit as the DH. It was created specifically for two-way superstar Shohei Ohtani.

Is 70 mph good for a 13 year old? Yes, pitching a baseball at 70 mph is exceptionally good for a 13-year-old. The average pitching speed for a 13-year-old generally ranges between 55 mph and 65 mph. Hitting 70 mph indicates advanced arm strength and mechanics for that age group.

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