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FIP Calculator

FIP estimates what a pitcher's ERA should be based only on the outcomes they control — home runs, walks, hit batters, and strikeouts — then scales it to look like ERA.

FIP

IP

≈ 3.10, set to league ERA − league FIP core

Fielding independent pitching
—
Scaled to look like ERA
Formula

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

FIP isolates the three outcomes a pitcher controls — home runs, walks/HBP, and strikeouts — then adds a league constant (about 3.10) to put it on the ERA scale.

How it works

FIP = (13×HR + 3×(BB + HBP) − 2×K) ÷ IP + constant. Home runs are penalized most, walks and hit batters moderately, and strikeouts credited. The constant re-centers the result on the ERA scale so a 3.50 FIP reads like a 3.50 ERA.

Frequently asked questions

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Sources

Last reviewed March 1, 2025. Rules and manufacturer charts change — verify against current official sources each season.