Winning Percentage — Win% & Pythagorean
Win% = Wins/(Wins+Losses). Pythagorean: Runs²/(Runs²+RA²). .716 Mariners 2001, 17–0 Dolphins, 73–9 Warriors. ESPN, Bill James.
Why This Stat Matters
Why: Win% standard across sports. Pythagorean predicts expected record from runs scored/allowed. .500 = average.
How: Enter wins, losses, ties. Optional: runs for/against for Pythagorean expectation.
- ●.716 Mariners 2001; 73–9 Warriors 2016
- ●Pythagorean: Runs²/(Runs²+RA²)
- ●17–0 Dolphins 1972 perfect season
📋 Quick Examples — Click to Load
📊 Historic Win%
📈 Win% Scale
🍩 73–9 Warriors Breakdown
📉 Actual vs Pythagorean (2001 Mariners)
For educational and informational purposes only. Verify with a qualified professional.
🏅 Sports Records
.716 Mariners 2001 (116 wins)
73–9 Warriors 2016 best NBA record
17–0 Dolphins 1972 perfect season
Win% = Wins / (Wins + Losses). With ties: Win% = (Wins + 0.5 × Ties) / Total. Pythagorean expectation: Win% = Runs² / (Runs² + Runs Against²)—Bill James's formula predicts wins from run differential. .500 = average. The 1972 Dolphins (17–0) are the only undefeated NFL champions. The 2001 Mariners won 116 (.716) but didn't win the World Series. The 2015–16 Warriors went 73–9 (.890).
Sources: ESPN, Sports Reference, Bill James.
Key Takeaways
- • Win% = Wins / (Wins + Losses); with ties add 0.5 × Ties to numerator
- • Pythagorean expectation predicts wins from run/point differential
- • .500 = average; .600+ strong; .700+ elite
- • 1972 Dolphins: only undefeated NFL champions (17–0)
Did You Know?
How Does Winning Percentage Work?
Basic Formula
Win% = Wins / (Wins + Losses). Example: 10–5 = 10/15 = .667 (66.7%). No ties: denominator is total games.
With Ties
Win% = (Wins + 0.5 × Ties) / Total. NHL, NFL (historically) use this. A tie = half a win. 9–1–1 = 9.5/11 = .864.
Pythagorean Expectation
Win% = Runs² / (Runs² + Runs Against²). Bill James. Predicts "true" record from run differential. Exponent 2 for baseball; varies by sport.
Expert Tips
Historic Records
| Team/Season | Record | Win% | Note |
|---|---|---|---|
| 1972 Dolphins | 17–0 | 1.000 | Only undefeated NFL |
| 2015–16 Warriors | 73–9 | .890 | Best NBA record |
| 2001 Mariners | 116–46 | .716 | Didn't win WS |
| Average | 81–81 | .500 | MLB 162 games |
Frequently Asked Questions
How is winning percentage calculated?
Win% = Wins / (Wins + Losses). With ties: Win% = (Wins + 0.5 × Ties) / Total Games. Example: 10–5 record = 10/(10+5) = .667 (66.7%).
What is Pythagorean expectation?
Bill James's formula predicts win% from run differential: Win% = Runs² / (Runs² + Runs Against²). Used in baseball to estimate "true" performance. Exponent varies by sport.
What is a good winning percentage?
.500 (50%) is average. Above .600 is strong; .700+ is elite. The 2015–16 Warriors went 73–9 (.890). The 2001 Mariners won 116 games (.716) but didn't win the World Series.
Who has the best NFL record ever?
Don Shula's 1972 Miami Dolphins are the only undefeated NFL champions (17–0, 1.000). The 2007 Patriots went 18–1 including playoffs but lost the Super Bowl.
How do ties affect winning percentage?
Ties count as half a win: Win% = (Wins + 0.5 × Ties) / Total. A 9–1–1 record = (9 + 0.5) / 11 = .864. NHL and NFL use this formula.
What is the Pythagorean exponent?
Baseball typically uses 2 (or 1.83). Basketball uses ~14. NFL uses 2.37. The exponent reflects how much run/point differential predicts wins in each sport.
Key Statistics
Official Data Sources
⚠️ Disclaimer: This calculator is for educational purposes only. Win% and Pythagorean formulas are standard; exponents vary by source. Not professional advice.