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MLB Calculators

13 tools

All 13 calculators

MLB

ERA Calculator

Earned run average from earned runs and innings pitched, with baseball's 6.1 = 6⅓ notation handled automatically.

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WHIP Calculator

Walks plus hits per inning pitched — the baserunner pressure stat.

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Strikeout Rate Calculator

K/9 and K% from strikeouts, innings and batters faced — the modern measure of swing-and-miss.

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BABIP Calculator

Batting average on balls in play — the regression signal for both pitchers and hitters.

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Batting Average Calculator

Batting average from hits and at-bats, displayed in baseball's three-digit notation.

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SLG Calculator

Slugging percentage from total bases, with isolated power (ISO) as a bonus.

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OBP Calculator

On-base percentage from hits, walks, hit-by-pitch and sacrifice flies — getting on base is the game.

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OPS Calculator

On-base plus slugging from a full slash-line input, the one-number summary of offensive production.

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WAR Calculator (Baseball)

An offensive WAR estimate from plate appearances and wRC+ with positional adjustment — clearly labelled as an estimate.

Calculate →FANTASY

MLB Fantasy Points Calculator

Roto-style fantasy points from a hitter's counting line: runs, hits, RBI, walks, homers and steals.

Calculate →SEASON

MLB Win Pace Calculator

Projected final wins across the 162-game season from any team's current record.

Calculate →SEASON

Pythagorean Wins MLB Calculator

Expected MLB wins from runs scored and allowed with Bill James's 1.83 exponent.

Calculate →SEASON

MLB Magic Number Calculator

The classic clinch formula: 163 − leader wins − chaser losses, with plain-language output.

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About these calculators

Thirteen baseball calculators split between pitching (ERA, WHIP, K-rate, BABIP) and hitting (average, slugging, OBP, OPS, a WAR estimate), plus win pace, Pythagorean expectation and the magic number for the 162-game season.

How to choose

Pick a tool matching the stat you want to check. Every calculator validates your input, shows the exact formula it uses, and explains how to read the result — no signup, nothing to install.

Frequently Asked Questions

How do I enter innings pitched?

Baseball notation: 6.1 means six and one-third innings. The calculator converts it to decimal automatically.

What is a good WHIP?

Below 1.10 is elite, around 1.30 is league average, and above 1.50 usually signals control problems.

Why is your WAR labelled an estimate?

Official WAR needs pitch-framing, defense and park factors. Our version uses offensive runs above average plus positional and replacement adjustments — great for sanity checks, not for record books.