FIP Calculator

FIP Calculator — calculate fip for training and performance. Evidence-based formula and benchmarks.

Baseball's quantitative revolution — Sabermetrics, named after SABR (Society for American Baseball Research) — has produced metrics that far outperform traditional statistics (batting average, RBI, wins) in predicting player value and team success. Wins Above Replacement (WAR) aggregates a player's total contribution into a single number representing wins contributed above a freely available replacement-level player. On-Base Plus Slugging (OPS) combines on-base percentage and slugging percentage into a reliable proxy for offensive value. Batting Average on Balls In Play (BABIP) measures a hitter's success rate on balls put in play (excluding home runs and strikeouts), useful for identifying over- and under-performers. Fielding Independent Pitching (FIP) measures what a pitcher's ERA would be in a league-average fielding environment, removing the influence of teammate defence.

These metrics underpin front-office decision-making across MLB and have filtered into international baseball analysis for NPB (Japan), KBO (Korea), and the growing European baseball leagues. Related offensive and pitching measures include the Baseball WAR calculator, OPS calculator, and BABIP calculator.

For OPS: enter at-bats, hits, doubles, triples, home runs, and walks; the calculator computes OBP + SLG separately then sums them.
For BABIP (hitter): enter hits, home runs, at-bats, and strikeouts; BABIP = (H − HR) ÷ (AB − K − HR + SF).
For FIP: enter home runs allowed, walks, hit-by-pitches, strikeouts, and innings pitched; FIP = (13×HR + 3×(BB+HBP) − 2×K) ÷ IP + FIP_constant (typically ~3.1).
For WAR: this requires offensive runs above average (batting), positional adjustment, baserunning, and defensive runs saved — enter each component or use season-long stats directly.
For wRC+: enter weighted runs created and compare to league average; 100 = league average, 150 = 50% better than average.

Sabermetric baseball formulas

OPS = OBP + SLG = (H + BB + HBP) ÷ (AB + BB + HBP + SF) + (1B + 2×2B + 3×3B + 4×HR) ÷ AB

BABIP = (H − HR) ÷ (AB − K − HR + SF)

FIP = (13×HR + 3×(BB + HBP) − 2×K) ÷ IP + FIP_constant (FIP_constant ≈ league_ERA − league_FIP to keep FIP on ERA scale)

wRC+ = (wOBA − league_wOBA) ÷ wOBA_scale × 100 + 100 (100 = league average)

Example FIP: pitcher with 10 HR, 30 BB, 5 HBP, 150 K in 150 IP → FIP = (13×10 + 3×35 − 2×150) ÷ 150 + 3.15 = (130 + 105 − 300) ÷ 150 + 3.15 = −65 ÷ 150 + 3.15 = 2.72. Excellent.

Interpreting baseball statistics

MLB benchmarks by metric

OPS benchmarks: below .650 = poor; .650–.700 = below average; .700–.750 = average; .750–.800 = above average; .800–.850 = great; .850–.900 = excellent; above .900 = elite. Career OPS leaders: Babe Ruth (.1164 — typo in historical records normalised; actual career OPS = 1.164), Ted Williams (1.116), Lou Gehrig (1.079). BABIP league average is approximately .300 for hitters; a hitter with .350 BABIP is likely overperforming and will regress; below .270 suggests bad luck or poor contact quality. FIP: below 3.00 = elite; 3.00–3.50 = excellent; 3.50–4.00 = good; 4.00–4.50 = average; above 4.50 = below average. WAR: 0–1 = bench player; 2–3 = regular starter; 4–5 = All-Star; 6–7 = MVP candidate; 8+ = MVP-level season.

Sports tips and best practices

FIP is more predictive of next-season ERA than ERA itself — if a pitcher's ERA is significantly higher than their FIP, expect improvement; if lower, expect regression.
BABIP stabilises over 800–1,000 at-bats for hitters; for pitchers it takes 3–4 seasons — treat single-season BABIP outliers with scepticism.
wRC+ is the best single offensive metric — it accounts for park factors and league context that OPS does not.
WAR is useful for cross-position and cross-era comparisons but has significant uncertainty; treat ±1 WAR as within the margin of error for any single season.
OPS+ (OPS normalised to 100 = league average, park-adjusted) is a better comparison tool than raw OPS across different eras and home parks.

Barry Bonds's 2004 season OPS of 1.422 is the highest single-season OPS in MLB history.
A pitcher with a FIP of 2.50 in a full season (180+ IP) is historically in the top 1% of all single-season pitching performances.
The MLB average BABIP has hovered around .295–.305 over the Statcast era (2015–present).
A 10-WAR season places a player in the conversation for the best performance in baseball that year; only a handful of players reach 10 WAR in any given season.

Common mistakes to avoid

Using ERA as a pitching evaluation tool without checking FIP — pitchers on good defensive teams will have lower ERAs than their true performance warrants.
Treating BABIP as a luck metric for pitchers — extreme BABIP outliers for pitchers (above .330 or below .265) are partly skill (soft contact, groundball rate) not purely luck.
Comparing WAR across different calculation systems (FanGraphs WAR and Baseball-Reference WAR differ by design) without noting which version is used.

Baseball statistics are used for analytical and entertainment purposes. WAR, FIP, wRC+, and other advanced metrics are not official MLB statistics; they are maintained by independent research organisations including FanGraphs, Baseball-Reference, and Baseball Savant. Methodologies differ between providers and are updated as research evolves. Always cite the specific version and provider when referencing advanced statistics in formal analysis.