Calculate Bill James Game Score for baseball pitching starts. Evaluate single-game pitching dominance with historical comparisons.
Game Score is a single-game pitching metric created by Bill James that assigns a numerical value to a starting pitcher's performance. Starting at 50 points, the formula adds and subtracts points based on innings pitched, strikeouts, hits allowed, runs, walks, and other events to produce a number that captures how dominant or poor a start was.
An average start registers around 50 Game Score. Quality starts typically fall in the 55-75 range, while exceptional starts score 80+. The highest Game Score in MLB history belongs to Kerry Wood's 20-strikeout one-hitter in 1998 (105 Game Score). A 9-inning perfect game scores approximately 98-101 depending on strikeouts.
This calculator lets you evaluate any pitching start by entering the game's box score stats. It provides context through historical comparisons, season projections, and milestone references so you can understand exactly where a start ranks in the spectrum of pitching performances.
Use the preset examples to load common values instantly, or type in custom inputs to see results in real time. The output updates as you type, making it practical to compare different scenarios without resetting the page.
Game Score distills an entire pitching performance into a single number, making it easy to compare starts across games, seasons, and eras. This tool is designed for quick, accurate results without manual computation. Whether you are a student working through coursework, a professional verifying a result, or an educator preparing examples, accurate answers are always just a few keystrokes away.
Game Score = 50 + (1 × Outs recorded) + (2 × IP after 4th inning) + (1 × K) - (2 × H) - (4 × ER) - (2 × Unearned Runs) - (1 × BB). Outs recorded = IP × 3. Updated version (Tom Tango): 40 + 2×Outs + K - 2×BB - 2×H - 3×ER - 6×HR.
Result: Game Score = 105
Kerry Wood's famous 1998 start: 9 IP, 1 H, 0 R, 0 BB, 20 K. Game Score = 50 + 27 + 10 + 20 - 2 - 0 - 0 - 0 = 105. This is the highest single-game Game Score in MLB history.
Start with 50. Add 1 per out recorded (IP × 3). Add 2 per inning after the 4th (so 1 point for the 5th, 2 for the 6th, etc.). Add 1 per strikeout. Subtract 2 per hit. Subtract 4 per earned run. Subtract 2 per unearned run. Subtract 1 per walk. The result is a score that ranges roughly from -20 (catastrophic) to 105+ (historic).
The all-time single-game leaderboard features some of the most memorable pitching performances ever. Kerry Wood's 1998 debut is #1 at 105. Max Scherzer's 20-K no-hitter is #2 at 104. Other notable entries include Nolan Ryan's no-hitters (mid-90s range), Roger Clemens' 20-K games, and Sandy Koufax's perfect game (97). Modern aces like Jacob deGrom and Justin Verlander regularly post 80+ Game Scores.
Season-long Game Score averages provide insight into pitcher consistency. A season average above 60 is All-Star caliber. Above 65 is Cy Young territory. The standard deviation of Game Score measures consistency—a pitcher with a 62 average and 10 SD is preferrable to one with a 62 average and 20 SD (wildly inconsistent).
Below 40 is poor, 40-49 is below average, 50-59 is average, 60-69 is quality start range, 70-79 is excellent, 80-89 is dominant, and 90+ is historically great. Use this as a practical reminder before finalizing the result.
Kerry Wood scored 105 on May 6, 1998 (9 IP, 1 H, 0 R, 0 BB, 20 K against the Astros). Max Scherzer's 20-K game scored 104. Perfect games with high K counts score 95-101.
A quality start (6+ IP, 3 or fewer ER) typically produces a Game Score of 50-65. The highest quality starts (7+ IP, 0-1 ER, 8+ K) can reach 80+.
Yes, Tom Tango developed an updated formula: 40 + 2×Outs + K - 2×BB - 2×H - 3×ER - 6×HR. This version is simpler and weights home runs more heavily. Both versions are widely used.
Game Score can be calculated for any pitching appearance, but it was designed for starters. Short relief outings tend to produce lower scores even when dominant because of the IP-based bonus structure.
Higher Game Scores correlate with wins, but the relationship isn't perfect because wins depend on run support. A Game Score of 70+ results in a win roughly 85% of the time historically.