Babe Ruth has the highest on-base percentage with 100+ at-bats in a month, with an on-base percentage of .611 in July 1920.
| NAME | OBP | AB | MONTH | G | R | H | 2B | 3B | HR | RBI | BB | HBP | SO | SB | CS | PA | TB | XBH | SH | SF | IBB | GIDP | AVG | SLG | OPS | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | B. Ruth | .611 | 100 | July 1920 | 34 | 45 | 44 | 10 | 2 | 13 | 33 | 43 | 1 | 19 | 5 | 147 | 97 | 25 | 3 | .440 | .970 | 1.581 | ||||
| 2 |  | T. Williams | .592 | 107 | August 1941 | 35 | 31 | 43 | 4 | 2 | 10 | 26 | 50 | 0 | 8 | 0 | 157 | 81 | 16 | 0 | 2 | .402 | .757 | 1.349 | |||
| 3 |  | C. Gehringer | .586 | 122 | August 1937 | 32 | 38 | 59 | 11 | 0 | 7 | 38 | 30 | 0 | 2 | 6 | 152 | 91 | 18 | 0 | .484 | .746 | 1.331 | ||||
| 4 |  | R. Hornsby | .584 | 100 | June 1925 | 28 | 31 | 48 | 9 | 2 | 9 | 31 | 25 | 0 | 6 | 2 | 126 | 88 | 20 | 1 | .480 | .880 | 1.464 | ||||
| 5 |  | L. Gehrig | .582 | 111 | June 1930 | 28 | 37 | 55 | 11 | 3 | 10 | 41 | 20 | 3 | 10 | 5 | 137 | 102 | 24 | 3 | .495 | .919 | 1.501 | ||||
| 6 |  | W. Boggs | .581 | 101 | June 1987 | 26 | 26 | 49 | 8 | 4 | 4 | 19 | 22 | 1 | 5 | 0 | 0 | 125 | 77 | 16 | 1 | 0 | 8 | 4 | .485 | .762 | 1.343 |
| 7 | | B. Ruth | .580 | 100 | June 1920 | 29 | 38 | 45 | 7 | 4 | 12 | 37 | 30 | 1 | 17 | 6 | 131 | 96 | 23 | 0 | .450 | .960 | 1.540 | ||||
| 8 | | G. Sisler | .578 | 114 | June 1920 | 29 | 33 | 60 | 9 | 3 | 4 | 26 | 13 | 1 | 2 | 9 | 131 | 87 | 16 | 3 | .526 | .763 | 1.341 | ||||
| 9 | | B. Ruth | .571 | 111 | July 1923 | 31 | 36 | 51 | 9 | 3 | 10 | 27 | 29 | 0 | 18 | 1 | 140 | 96 | 22 | 0 | .459 | .865 | 1.436 | ||||
| 10 | | R. Hornsby | .570 | 106 | August 1924 | 29 | 29 | 54 | 13 | 2 | 8 | 22 | 15 | 0 | 7 | 0 | 127 | 95 | 23 | 6 | .509 | .896 | 1.466 | ||||
| 11 | | J. Jackson | .568 | 102 | June 1912 | 29 | 28 | 54 | 16 | 8 | 1 | 7 | 2 | 4 | 113 | 89 | 25 | 2 | .529 | .873 | 1.440 | ||||||
| 12 | | W. Boggs | .567 | 102 | May 1986 | 27 | 24 | 48 | 9 | 0 | 3 | 20 | 24 | 0 | 5 | 0 | 1 | 127 | 66 | 12 | 0 | 1 | 0 | 2 | .471 | .647 | 1.214 |
| 13 |  | T. Cobb | .562 | 127 | July 1912 | 30 | 33 | 67 | 11 | 8 | 3 | 21 | 9 | 1 | 15 | 137 | 103 | 22 | 0 | .528 | .811 | 1.373 | |||||
| 14 | | T. Williams | .559 | 104 | July 1954 | 33 | 31 | 40 | 7 | 0 | 11 | 29 | 45 | 0 | 9 | 0 | 0 | 152 | 80 | 18 | 0 | 3 | 2 | .385 | .769 | 1.328 | |
| 15 | | R. Sievers | .558 | 103 | July 1960 | 28 | 31 | 46 | 5 | 0 | 12 | 30 | 25 | 1 | 8 | 1 | 0 | 129 | 87 | 17 | 0 | 0 | 4 | 1 | .447 | .845 | 1.403 |
| 16 | | R. Hornsby | .556 | 112 | July 1924 | 31 | 34 | 52 | 8 | 3 | 7 | 27 | 23 | 0 | 6 | 1 | 139 | 87 | 18 | 4 | .464 | .777 | 1.332 | ||||
| 17 | | B. Ruth | .556 | 131 | July 1924 | 37 | 43 | 59 | 9 | 3 | 14 | 40 | 31 | 0 | 16 | 2 | 164 | 116 | 26 | 2 | .450 | .885 | 1.441 | ||||
| 18 | | L. Berkman | .553 | 104 | May 2008 | 28 | 31 | 49 | 11 | 1 | 9 | 22 | 18 | 1 | 18 | 6 | 1 | 123 | 89 | 21 | 0 | 0 | 6 | 1 | .471 | .856 | 1.409 |
| 19 |  | M. Mantle | .551 | 105 | June 1957 | 30 | 30 | 44 | 7 | 2 | 11 | 30 | 31 | 0 | 17 | 3 | 0 | 136 | 88 | 20 | 0 | 0 | 5 | 0 | .419 | .838 | 1.390 |
| 20 | | B. Ruth | .549 | 111 | July 1927 | 31 | 34 | 47 | 8 | 3 | 9 | 35 | 31 | 0 | 14 | 1 | 145 | 88 | 20 | 3 | .423 | .793 | 1.342 | ||||
| 21 | | T. Helton | .548 | 105 | August 2000 | 29 | 22 | 50 | 18 | 0 | 7 | 32 | 17 | 2 | 7 | 2 | 0 | 126 | 89 | 25 | 0 | 2 | 5 | 1 | .476 | .848 | 1.395 |
| 22 | | H. Heilmann | .546 | 104 | May 1925 | 29 | 21 | 45 | 9 | 4 | 3 | 31 | 26 | 0 | 7 | 1 | 137 | 71 | 16 | 7 | .433 | .683 | 1.229 | ||||
| 23 | | T. Williams | .546 | 116 | August 1949 | 31 | 31 | 47 | 7 | 2 | 10 | 34 | 36 | 0 | 6 | 0 | 152 | 88 | 19 | 0 | 3 | .405 | .759 | 1.305 | |||
| 24 | | C. Keller | .543 | 119 | August 1939 | 30 | 34 | 50 | 4 | 2 | 4 | 27 | 32 | 0 | 13 | 2 | 152 | 70 | 10 | 1 | 1 | .420 | .588 | 1.131 | |||
| 25 | | T. Williams | .540 | 101 | May 1941 | 26 | 29 | 44 | 7 | 0 | 6 | 22 | 22 | 1 | 3 | 1 | 124 | 69 | 13 | 0 | 3 | .436 | .683 | 1.223 | |||
StatMuse has game-level data for on-base percentage going back to the 1908 season.
Some of the information used here was obtained free of charge from Retrosheet.
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