ERA & WHIP calculator

Enter innings pitched, earned runs, hits and walks to instantly calculate ERA, WHIP, K/BB and strikeouts per game. Choose your game length for youth leagues.

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Innings pitched

e.g. 5⅔ innings = 5 and 2/3

Innings per gameScale for ERA and strikeouts per gameEarned runs (ER)Hits allowed (H)Walks (BB)Strikeouts (SO)

Results

ERA

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WHIP

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K/BB

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K/9

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The formulas

ERA = ER × innings per game ÷ IP

WHIP = (H + BB) ÷ IP

K/BB = SO ÷ BB

K per game = SO × innings per game ÷ IP

“Innings per game” is the length of a regulation game. MLB and high school use 9, but many youth and amateur leagues play 6 or 7, so you can pick the length that matches your league.

Fractional innings

Three outs make one inning. 5⅔ innings is 17 outs, or 5.667 innings in the formulas. If a box score says “5.2”, that means 5⅔, so choose 5 and 2/3 here.

How to read them

ERA: runs allowed per full game. Lower is better.
WHIP: base runners allowed per inning. Lower is better; under 1.00 is elite in MLB.
K/BB: strikeouts per walk. Higher means better control. Undefined with zero walks.
K per game: strikeouts per full game.

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ERA, WHIP & K/9 Calculator (Supports 6- and 7-Inning Games) | My Baseball Stats