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FIP (Fielding Independent Pitching) calculator

FIP estimates a pitcher's run prevention using only the outcomes they control — home runs, walks, hit-by-pitches and strikeouts — scaled to look like ERA: FIP = ((13·HR) + (3·(BB + HBP)) − (2·K)) ÷ IP + constant. The league constant (default 3.10) sets FIP to the same scale as league ERA. Innings use the .1 = ⅓, .2 = ⅔ notation.

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Enter Home runs allowed (HR), Walks (BB), Hit by pitch (HBP), Strikeouts (K), Innings pitched (IP, .1=⅓), FIP constant and the FIP (Fielding Independent Pitching) calculator works out FIP, Innings (decimal) straight away. For instance, with Home runs allowed (HR) = 9, Walks (BB) = 31, Hit by pitch (HBP) = 0, Strikeouts (K) = 239, Innings pitched (IP, .1=⅓) = 198.1 and FIP constant = 3.1 it returns FIP = 1.75 and Innings (decimal) = 198.33.

How to use it

  1. Enter your values: Home runs allowed (HR), Walks (BB), Hit by pitch (HBP), Strikeouts (K), Innings pitched (IP, .1=⅓), FIP constant.
  2. Read the result instantly: FIP, Innings (decimal).

Frequently asked questions

How does the FIP (Fielding Independent Pitching) calculator work?

It takes Home runs allowed (HR), Walks (BB), Hit by pitch (HBP), Strikeouts (K), Innings pitched (IP, .1=⅓) and FIP constant and derives FIP and Innings (decimal) from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

6 values: Home runs allowed (HR), Walks (BB), Hit by pitch (HBP), Strikeouts (K), Innings pitched (IP, .1=⅓) and FIP constant. Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Home runs allowed (HR) = 9, Walks (BB) = 31, Hit by pitch (HBP) = 0, Strikeouts (K) = 239, Innings pitched (IP, .1=⅓) = 198.1 and FIP constant = 3.1, the calculator returns FIP = 1.75 and Innings (decimal) = 198.33. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

When would I actually use this?

Running a league or a tournament: how many fixtures a format produces, how the table resolves ties, and what a team still needs to qualify.

What is the most common mistake?

Assuming tie-breaks work the same everywhere. Goal difference, head-to-head and goals scored are applied in a different order by nearly every competition, and the order decides the table.

How accurate is it, and what are the limits?

The FIP constant differs by season and league (roughly 3.0–3.2); adjust it to match the year you are analysing so FIP lines up with league ERA.

What is the difference between the FIP (Fielding Independent Pitching) calculator and the ERA (earned run average) calculator?

This one returns FIP; the ERA (earned run average) calculator returns ERA. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

OPS (on-base plus slugging) calculator is the closest one after this: OPS combines the two halves of hitting — getting on base and hitting for power — into one number: OPS = OBP + SLG. On-base percentage = (H + BB + HBP) ÷ (AB + BB + HBP + SF); slugging = (1B + 2·2B + 3·3B + 4·HR) ÷ AB, with singles = H − 2B − 3B − HR. It is the fastest all-round gauge of an offensive player.

What else is worth having open alongside it?

WHIP (walks + hits per inning pitched) calculator and WAR (Wins Above Replacement) calculator — simplified — they come up in the same task often enough to be worth a second tab.

Where do the figures come from, and how current are they?

Fixture counts and point totals are pure combinatorics and hold for any competition. The tie-break order is set by each governing body's own regulations — check the one you are actually in.

Further reading

All guides →
ComparisonERA, FIP and WHIP: Three Answers to One QuestionERA measures what happened, FIP measures only what the pitcher controls without his fielders, WHIP measures traffic allowed. Two pitchers can swap places entirely between them — and the gap between ERA and FIP is a forecast, not a verdict.ExplainerOPS Is a Flawed Sum, and Still the Most Useful Number on the CardOPS adds two fractions with different denominators, which as arithmetic is indefensible. It survives because it tracks run scoring far better than batting average and costs nothing to compute — but it underpays on-base ability, and OPS+ does not fix that.ExplainerHow a Golf Handicap Is Actually Calculated Under the World Handicap SystemBest 8 of your last 20 score differentials, averaged, and no 0.96 multiplier — that disappeared in 2020. Here is the full chain from a gross 92 to a Course Handicap of 17, with the numbers worked out.ExplainerSleeping Bag Temperature Ratings, and What Comfort Actually MeansThe numbers on a sleeping bag come from ISO 23537-1, which publishes four figures and lets retailers print one. The standard measures a heated manikin's heat loss — so it measures insulation, and its own test mat is R 4.8. Put the same bag on an R 1.5 pad and the heat leaving through your back more than triples.How-toHow to Calculate Batting Average and What .300 MeansBatting average is hits divided by at-bats. Learn how to calculate it, why a .300 hitter is excellent and what counts as an at-bat in baseball.ExplainerExpected Goals: What xG Actually MeasuresxG is the fitted probability that a shot with a given set of features becomes a goal — a model output, not an observation. A worked match, the binomial arithmetic that says one game is far too few shots, and the limits nobody quotes.