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Boston Red Sox in numbers: decades, seasons and the World Series
How many games have the Boston Red Sox won all time? This page answers with Retrosheet's game logs: from 1901 to 2025, the franchise, now in MLB's American League, played 19,463 regular season games, going 10,044 and 9,336 for a .518 winning percentage, with 9 World Series titles. Below are the decade by decade record, the best and worst seasons, and one piece of club history checked outside the numbers.
Record by decade (regular season)
| Decade | G | W | L | T | PCT |
|---|---|---|---|---|---|
| 1900s | 1344 | 691 | 634 | 19 | .522 |
| 1910s | 1507 | 857 | 624 | 26 | .579 |
| 1920s | 1542 | 595 | 938 | 9 | .388 |
| 1930s | 1528 | 705 | 815 | 8 | .464 |
| 1940s | 1552 | 854 | 683 | 15 | .556 |
| 1950s | 1543 | 814 | 725 | 4 | .529 |
| 1960s | 1610 | 764 | 845 | 1 | .475 |
| 1970s | 1609 | 895 | 714 | 0 | .556 |
| 1980s | 1564 | 821 | 742 | 1 | .525 |
| 1990s | 1555 | 814 | 741 | 0 | .523 |
| 2000s | 1619 | 920 | 699 | 0 | .568 |
| 2010s | 1620 | 872 | 748 | 0 | .538 |
| 2020s | 870 | 442 | 428 | 0 | .508 |
| Total | 19463 | 10044 | 9336 | 83 | .518 |
Key: G games, W wins, L losses and T ties, those old games suspended by darkness and never completed, which stay out of the winning percentage. The decade the Boston Red Sox entered the league and the current decade appear incomplete.
Decade by decade, the Boston Red Sox peak came in the 1910s: 857 wins across 1,507 games, a .579 percentage. The roughest stretch was the 1920s, at 595 wins and 938 losses (.388). The gap between the franchise ceiling and floor shows how baseball punishes and rewards in long cycles.
Best and worst seasons
| Kind | Season | W | L | PCT |
|---|---|---|---|---|
| Best | 1912 | 105 | 47 | .691 |
| 2nd best | 1946 | 104 | 50 | .675 |
| 3rd best | 1915 | 101 | 50 | .669 |
| Worst | 1932 | 43 | 111 | .279 |
| 2nd worst | 1926 | 46 | 107 | .301 |
| 3rd worst | 1925 | 47 | 105 | .309 |
Seasons need at least 100 decisions to qualify, which excludes 2020, shortened to 60 games. A curiosity computed from the logs: the longest Boston Red Sox winning streak in a single season was 15 games, in 1946.
World Series: titles and appearances
9 World Series titles sit in the Boston Red Sox history books: 1903 (Boston Americans), 1912, 1915, 1916, 1918, 2004, 2007, 2013, 2018. In all, the franchise reached the final 13 times. Names in parentheses show what the franchise was called in that title year; scores and opponents for each series are in the year by year World Series archive table.
One fact to keep
After selling Babe Ruth in 1920, the club went 86 years without a title, a wait the press named the Curse of the Bambino. The turn came in 2004: down 3-0 to the Yankees in the American League Championship Series, Boston won four straight, the only team in MLB history to win a postseason series after trailing 3-0, then took the World Series.
Where these numbers come from
Every total, decade and record on this page about the Boston Red Sox comes from the game logs (one line per game) of the Retrosheet project (retrosheet.org), seasons 1901 to 2025 of the American and National Leagues, snapshot of 2026-07-10, recomputed by this site and copied from no one. Tie games count as games played, stay out of the percentage and do not interrupt winning streaks; the 100 decision filter keeps the short 2020 season out of the best and worst campaign lists. The statement below appears verbatim because Retrosheet's license requires it.
The information used here was obtained free of charge from and is copyrighted by Retrosheet. Interested parties may contact Retrosheet at "www.retrosheet.org".
This is an independent site with no ties to MLB or to any club; MLB, World Series and the team names are trademarks of their owners and appear here only to identify the facts.
Last updated: · Methodology and sources