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FIP

Calculate Fielding Independent Pitching (FIP). Pedro 1.39, Kershaw 1.81, deGrom. ERA-FIP differential, xFIP estimate. Tom Tango 2006.

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⚡Defense-Independent

FIP Calculator

Pedro 1.39, Kershaw 1.81, deGrom. FIP isolates pitching from defense. Tom Tango 2006. Constant ~3.10.

FanGraphsBaseball-Reference

Elite FIP Seasons

Best for: Evaluating true pitching talent, ERA-FIP differential, predicting future ERA, defense-independent analysis.

fip_result.txt●
$ fip --hr 15 --bb 50 --k 180 --ip 180
FIP: 3.10
HR: 15
BB+HBP: 55
K: 180
IP: 180
xFIP: 3.69
FIP = ((13×HR) + (3×(BB+HBP)) - (2×K)) / IP + 3.1
FIP = ((13×15) + (3×55) - (2×180)) / 180.3 + 3.1
FIP = 3.10
xFIP estimate: 3.69
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Summary

FIP 3.10 — Solid

📸 Screenshot Summary

3.10
HR:15 BB:50 K:180 IP:180
FIP

⚠️For educational and informational purposes only. Verify with a qualified professional.

Answer Capsule

FIP = ((13×HR)+(3×(BB+HBP))-(2×K))/IP + 3.10. Isolates pitching from defense. FanGraphs creator Tom Tango popularized it in 2006. FIP constant ~3.10.

Key Takeaways

  • FIP = ((13×HR) + (3×(BB+HBP)) - (2×K)) / IP + 3.10.
  • FIP isolates pitcher-controlled events; defense and BABIP excluded.
  • ERA - FIP > 0 suggests luck; < 0 suggests unluck or poor defense.
  • Uses 3 defense-independent stats: HR, BB+HBP, K.

Did You Know?

📊 FIP isolates pitching from defense—BABIP and errors don\'t affect it. (FanGraphs)
📅 Tom Tango popularized FIP in 2006; FanGraphs is the primary source. (FanGraphs)
📐 The FIP constant is ~3.10; it scales FIP to league ERA. (Baseball-Reference)
🏆 Clayton Kershaw had one of the best ERA-FIP differentials—elite defense behind him. (SABR)
⚡ FIP below 2.00 is elite; Pedro\'s 1.39 in 1999 is the best ever. (FanGraphs)
📈 FIP correlates better with future ERA than past ERA. (Baseball-Reference)

How It Works

Formula

FIP weights events by their run impact: HR (13), BB+HBP (3), K (-2). The constant aligns FIP to league ERA. Pitchers with high BABIP or bad defense often have ERA > FIP.

Defense-Independent

Each HR adds ~13 to the numerator; each walk or HBP adds 3; each strikeout subtracts 2. Over 200 IP, 10 extra HR ≈ +0.65 FIP; 20 extra K ≈ -0.20 FIP.

SIERA and xFIP

SIERA (Skill-Interactive ERA) refines FIP with batted-ball data. xFIP normalizes HR rate to league average—useful when a pitcher\'s HR/FB seems unsustainable. Both improve predictive value.

Expert Tips

Compare FIP to ERA—large gaps often regress.
Use xFIP for small samples when HR rate seems fluky.
FIP predicts future ERA better than current ERA.
Fantasy: target pitchers with FIP < 3.50 for sustainable value.

Comparison Table

FIPLevelStatus
2Elite (<2)✅
3Excellent (<3)✅
3.5Solid (<3.5)⚠️
4League Avg⚠️

Infographic Stats

3.10
FIP constant
3
Defense-independent stats
2006
Tango popularized FIP
<2.00
Elite FIP

Official Sources

FanGraphs

Invented FIP; comprehensive FIP, xFIP, SIERA data

Last updated: 2025-01

Baseball-Reference

MLB pitching statistics including FIP

Last updated: 2025-01

SABR

Society for American Baseball Research

Last updated: 2025-01

Sample Calculation

Pedro 1999: 9 HR, 43 BB+HBP, 313 K, 213.1 IP.

FIP = ((13×9)+(3×43)-(2×313))/213.1 + 3.10 = 1.39

Best FIP season in modern history.

Quick Reference

FIP = ((13×HR)+(3×(BB+HBP))-(2×K))/IP + 3.10

  • • 3.10 — FIP constant
  • • 3 — Defense-independent stats (HR, BB+HBP, K)
  • • 2006 — Tom Tango popularized
  • • <2.00 — Elite FIP

Disclaimer: FIP constant varies by season. xFIP is an approximation. Official stats from FanGraphs.

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