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FIP Calculator

SportsSports Performance

Baseball notation: 180.1 means 180 innings and one out.

League-season value that puts FIP on the ERA scale; about 3.10 in most MLB seasons.

FIP —
Rough MLB tier
—
Raw FIP (before constant)
—
True innings
—
K per 9
—
BB + HBP per 9
—
HR per 9
—
FIP against MLB tiers
The chart appears with your result

FIP (fielding independent pitching) is (13 × HR + 3 × (BB + HBP) − 2 × K) ÷ IP plus a league constant near 3.10. A pitcher with 180 innings, 18 home runs, 45 walks, 5 hit batters and 180 strikeouts has 24 weighted events, 0.13 per inning, so a FIP of 3.23.

About this tool

FIP strips out what the defence behind a pitcher does and keeps only the outcomes the pitcher controls: home runs, walks, hit batters and strikeouts. Scouts, fantasy players and analysts use it to judge whether an ERA is backed by the underlying work or propped up by good fielding and luck on balls in play. Enter the season line and the tool returns FIP on the ERA scale, the raw value before the constant, rates per nine innings and where the number sits against rough MLB tiers on a scale chart. Innings use baseball notation, so 180.2 counts as 180 and two-thirds. One limit: the constant changes every season and league, so for an exact match with published figures, type that year's constant in.

How to use it

  1. Enter innings pitched

    Use the box-score form: .1 for one out and .2 for two outs. Any other decimal is rejected.

  2. Add the four event counts

    Set home runs with the − / + buttons, then type walks, hit batters and strikeouts. Hit batters can be left empty.

  3. Set the constant

    3.10 is a typical MLB value. Replace it with the published constant for the season you are matching.

  4. Read FIP and the rates

    FIP, its tier and the per-nine rates update as you type, and the steps show each part of the sum.

Examples

180 IP, 18 HR, 45 BB, 5 HBP, 180 K

Innings pitched
180
Home runs allowed
18
Walks (BB)
45
Hit batters (HBP)
5
Strikeouts (K)
180
FIP constant
3.1

Result FIP: 3.23
Rough MLB tier: Great
Raw FIP (before constant): 0.13
True innings: 180
K per 9: 9
BB + HBP per 9: 2.5
HR per 9: 0.9

  1. Innings: 180 = 180 + 0/3 = 180 true innings
  2. Weighted events = 13 × 18 + 3 × (45 + 5) − 2 × 180 = 24
  3. Per inning = 24 ÷ 180 = 0.133
  4. FIP = 0.133 + 3.1 = 3.23

234 + 150 − 360 leaves 24 weighted events over 180 innings, or 0.13 per inning; adding the 3.10 constant gives a FIP of 3.23.

200.2 IP with 220 strikeouts

Innings pitched
200.2
Home runs allowed
15
Walks (BB)
40
Hit batters (HBP)
4
Strikeouts (K)
220
FIP constant
3.1

Result FIP: 2.54
Rough MLB tier: Excellent
Raw FIP (before constant): -0.56
True innings: 200.67
K per 9: 9.87
BB + HBP per 9: 1.97
HR per 9: 0.67

  1. Innings: 200.2 = 200 + 2/3 = 200.667 true innings
  2. Weighted events = 13 × 15 + 3 × (40 + 4) − 2 × 220 = -113
  3. Per inning = -113 ÷ 200.667 = -0.563
  4. FIP = -0.563 + 3.1 = 2.54

200.2 is 200 and two-thirds innings. Strikeouts outweigh the home runs and walks, so the raw value is negative (−0.56) and FIP lands well under 3.

How it is calculated

FIP = (13 × HR + 3 × (BB + HBP) − 2 × K) ÷ IP + C

HR
home runs allowed
BB
walks issued (FanGraphs subtracts intentional walks; enter BB minus IBB to match)
HBP
batters hit by a pitch
K
strikeouts
IP
true innings, where each .1 in box-score notation is one third
C
league constant that sets average FIP equal to average ERA

The weights come from run values: a home run costs about 13 times as much per inning as the baseline, a walk or hit batter 3 times, and a strikeout saves about 2. The weighted sum is divided by innings and the constant is added so league FIP and league ERA match for the season.

When not to use it

  • Samples under about 40 innings, where one home run swings FIP sharply.
  • Judging pitchers who live on weak contact, since FIP ignores balls in play.
  • Comparing across leagues or eras without changing the constant.

Common mistakes

  • Typing 180.33 for 180 and one-third innings instead of 180.1.
  • Leaving intentional walks in when matching FanGraphs figures.
  • Mixing a season's counts with another season's constant.

Frequently asked questions

Why is FIP different from ERA?

ERA counts every earned run, including those caused by bloop hits, poor range in the field and sequencing luck. FIP uses only home runs, walks, hit batters and strikeouts, so a pitcher with a lot of luck on balls in play will usually have an ERA lower than FIP, and one with bad luck the reverse.

Where do I find the FIP constant?

FanGraphs publishes a Guts table listing the constant for each MLB season. It usually sits between 3.0 and 3.2. Use the value for the season whose counts you entered.

What counts as a good FIP?

In recent MLB seasons, a FIP under 3.00 is elite, around 3.50 is very good, about 4.00 to 4.20 is near league average, and above 5.00 is poor. Those bands shift slightly with the run environment of each season.

Can the raw value be negative?

Yes. When twice the strikeouts exceed the weighted home runs, walks and hit batters, the numerator is negative. A heavy strikeout pitcher can therefore have a raw value below zero and a FIP under the constant.

How is xFIP related?

xFIP replaces actual home runs with the number expected from the pitcher's fly balls at league home-run-per-fly-ball rate. This page computes standard FIP only, since it does not take fly-ball counts.

Does it work for college or amateur leagues?

The weights still apply, but the constant should be that league's average ERA minus its average raw FIP. Work that out from league totals and enter it in the constant box.

Cite this tool

Using this tool in an assignment, article or report? Copy a citation, or a link for your website.

APA

Tools Directory Editorial Team. (2026, October 15). FIP Calculator. Tools Directory. Retrieved October 26, 2026, from https://tools.milunir.com/sports/sports-performance/fip-calculator/

MLA

Tools Directory Editorial Team. “FIP Calculator.” Tools Directory, 15 Oct. 2026, https://tools.milunir.com/sports/sports-performance/fip-calculator/. Accessed 26 Oct. 2026.

Chicago

Tools Directory Editorial Team. “FIP Calculator.” Tools Directory. Last modified October 15, 2026. Accessed October 26, 2026. https://tools.milunir.com/sports/sports-performance/fip-calculator/.

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