COLLEGE FOOTBALL STATISTICS
2021: 4th Down Conversion Pct Defense
| Rank | Team | G | W-L | Opp 4th Conv | Opp 4th Att | Pct |
| 1 | Utah St. (Mountain West) | 14 | 11-3 | 5 | 21 | 0.238 |
| 2 | Pittsburgh (ACC) | 14 | 11-3 | 7 | 26 | 0.269 |
| 3 | Kentucky (SEC) | 13 | 10-3 | 5 | 18 | 0.278 |
| 4 | Oklahoma St. (Big 12) | 14 | 12-2 | 8 | 27 | 0.296 |
| 5 | Nebraska (Big Ten) | 12 | 3-9 | 6 | 20 | 0.300 |
| 6 | Wyoming (Mountain West) | 13 | 7-6 | 8 | 25 | 0.320 |
| 7 | Fresno St. (Mountain West) | 13 | 10-3 | 7 | 20 | 0.350 |
| 8 | Texas A&M (SEC) | 12 | 8-4 | 6 | 17 | 0.353 |
| 8 | ULM (Sun Belt) | 12 | 4-8 | 12 | 34 | 0.353 |
| 10 | Army West Point (FBS Independent) | 13 | 9-4 | 11 | 31 | 0.355 |
| 11 | Purdue (Big Ten) | 13 | 9-4 | 8 | 22 | 0.364 |
| 12 | Minnesota (Big Ten) | 13 | 9-4 | 7 | 19 | 0.368 |
| 13 | Auburn (SEC) | 13 | 6-7 | 10 | 27 | 0.370 |
| 14 | App State (Sun Belt) | 14 | 10-4 | 9 | 24 | 0.375 |
| 14 | Wake Forest (ACC) | 14 | 11-3 | 9 | 24 | 0.375 |
| 16 | Hawaii (Mountain West) | 13 | 6-7 | 8 | 21 | 0.381 |
| 16 | Oregon St. (Pac-12) | 13 | 7-6 | 8 | 21 | 0.381 |
| 18 | Air Force (Mountain West) | 13 | 10-3 | 10 | 25 | 0.400 |
| 18 | Boise St. (Mountain West) | 12 | 7-5 | 6 | 15 | 0.400 |
| 18 | Bowling Green (MAC) | 12 | 4-8 | 10 | 25 | 0.400 |
| 18 | Louisiana Tech (C-USA) | 12 | 3-9 | 10 | 25 | 0.400 |
| 18 | Mississippi St. (SEC) | 13 | 7-6 | 6 | 15 | 0.400 |
| 18 | UCLA (Pac-12) | 12 | 8-4 | 10 | 25 | 0.400 |
| 18 | West Virginia (Big 12) | 13 | 6-7 | 10 | 25 | 0.400 |
| 25 | Georgia (SEC) | 15 | 14-1 | 13 | 32 | 0.406 |
| 26 | Wisconsin (Big Ten) | 13 | 9-4 | 11 | 27 | 0.407 |
| 27 | Florida (SEC) | 13 | 6-7 | 9 | 22 | 0.409 |
| 28 | Northern Ill. (MAC) | 14 | 9-5 | 12 | 29 | 0.414 |
| 28 | Old Dominion (C-USA) | 13 | 6-7 | 12 | 29 | 0.414 |
| 30 | Clemson (ACC) | 13 | 10-3 | 10 | 24 | 0.417 |
| 31 | Colorado (Pac-12) | 12 | 4-8 | 8 | 19 | 0.421 |
| 31 | Ga. Southern (Sun Belt) | 12 | 3-9 | 8 | 19 | 0.421 |
| 31 | Iowa St. (Big 12) | 13 | 7-6 | 8 | 19 | 0.421 |
| 34 | Central Mich. (MAC) | 13 | 9-4 | 14 | 33 | 0.424 |
| 35 | Southern Miss. (C-USA) | 12 | 3-9 | 6 | 14 | 0.429 |
| 36 | Houston (AAC) | 14 | 12-2 | 13 | 30 | 0.433 |
| 36 | SMU (AAC) | 12 | 8-4 | 13 | 30 | 0.433 |
| 38 | Washington St. (Pac-12) | 13 | 7-6 | 10 | 23 | 0.435 |
| 39 | Western Ky. (C-USA) | 14 | 9-5 | 18 | 41 | 0.439 |
| 40 | Maryland (Big Ten) | 13 | 7-6 | 11 | 25 | 0.440 |
| 41 | Iowa (Big Ten) | 14 | 10-4 | 12 | 27 | 0.444 |
| 41 | Rutgers (Big Ten) | 13 | 5-8 | 8 | 18 | 0.444 |
| 43 | Coastal Carolina (Sun Belt) | 13 | 11-2 | 13 | 29 | 0.448 |
| 44 | NC State (ACC) | 12 | 9-3 | 9 | 20 | 0.450 |
| 45 | Miami (FL) (ACC) | 12 | 7-5 | 10 | 22 | 0.455 |
| 46 | Toledo (MAC) | 13 | 7-6 | 11 | 24 | 0.458 |
| 47 | Marshall (C-USA) | 13 | 7-6 | 16 | 34 | 0.471 |
| 48 | Eastern Mich. (MAC) | 13 | 7-6 | 10 | 21 | 0.476 |
| 48 | Ohio St. (Big Ten) | 13 | 11-2 | 10 | 21 | 0.476 |
| 50 | Boston College (ACC) | 12 | 6-6 | 11 | 23 | 0.478 |
| 50 | Florida St. (ACC) | 12 | 5-7 | 11 | 23 | 0.478 |
| 50 | Tulsa (AAC) | 13 | 7-6 | 11 | 23 | 0.478 |
| 53 | UCF (AAC) | 13 | 9-4 | 14 | 29 | 0.483 |
| 54 | Ole Miss (SEC) | 13 | 10-3 | 17 | 35 | 0.486 |
| 55 | Arizona (Pac-12) | 12 | 1-11 | 4 | 8 | 0.500 |
| 55 | Arizona St. (Pac-12) | 13 | 8-5 | 13 | 26 | 0.500 |
| 55 | California (Pac-12) | 12 | 5-7 | 6 | 12 | 0.500 |
| 55 | Liberty (FBS Independent) | 13 | 8-5 | 15 | 30 | 0.500 |
| 55 | Michigan (Big Ten) | 14 | 12-2 | 16 | 32 | 0.500 |
| 55 | San Diego St. (Mountain West) | 14 | 12-2 | 12 | 24 | 0.500 |
| 55 | South Carolina (SEC) | 13 | 7-6 | 5 | 10 | 0.500 |
| 55 | UTEP (C-USA) | 13 | 7-6 | 16 | 32 | 0.500 |
| 63 | Louisiana (Sun Belt) | 14 | 13-1 | 21 | 41 | 0.512 |
| 64 | Cincinnati (AAC) | 14 | 13-1 | 19 | 37 | 0.514 |
| 64 | Tennessee (SEC) | 13 | 7-6 | 19 | 37 | 0.514 |
| 66 | Utah (Pac-12) | 14 | 10-4 | 17 | 33 | 0.515 |
| 67 | Georgia St. (Sun Belt) | 13 | 8-5 | 15 | 29 | 0.517 |
| 67 | Nevada (Mountain West) | 13 | 8-5 | 15 | 29 | 0.517 |
| 69 | Middle Tenn. (C-USA) | 13 | 7-6 | 14 | 27 | 0.519 |
| 69 | UAB (C-USA) | 13 | 9-4 | 14 | 27 | 0.519 |
| 71 | Louisville (ACC) | 13 | 6-7 | 12 | 23 | 0.522 |
| 72 | Ball St. (MAC) | 13 | 6-7 | 11 | 21 | 0.524 |
| 72 | Miami (OH) (MAC) | 13 | 7-6 | 11 | 21 | 0.524 |
| 72 | UNLV (Mountain West) | 12 | 2-10 | 11 | 21 | 0.524 |
| 72 | UTSA (C-USA) | 14 | 12-2 | 11 | 21 | 0.524 |
| 76 | Syracuse (ACC) | 12 | 5-7 | 10 | 19 | 0.526 |
| 77 | New Mexico St. (FBS Independent) | 12 | 2-10 | 8 | 15 | 0.533 |
| 78 | Fla. Atlantic (C-USA) | 12 | 5-7 | 15 | 28 | 0.536 |
| 79 | Alabama (SEC) | 15 | 13-2 | 17 | 31 | 0.548 |
| 80 | Massachusetts (FBS Independent) | 12 | 1-11 | 11 | 20 | 0.550 |
| 81 | TCU (Big 12) | 12 | 5-7 | 10 | 18 | 0.556 |
| 82 | Notre Dame (FBS Independent) | 13 | 11-2 | 9 | 16 | 0.562 |
| 83 | Ohio (MAC) | 12 | 3-9 | 15 | 26 | 0.577 |
| 84 | Texas (Big 12) | 12 | 5-7 | 11 | 19 | 0.579 |
| 85 | Northwestern (Big Ten) | 12 | 3-9 | 7 | 12 | 0.583 |
| 85 | South Alabama (Sun Belt) | 12 | 5-7 | 14 | 24 | 0.583 |
| 85 | Stanford (Pac-12) | 12 | 3-9 | 14 | 24 | 0.583 |
| 88 | North Carolina (ACC) | 13 | 6-7 | 10 | 17 | 0.588 |
| 88 | Washington (Pac-12) | 12 | 4-8 | 10 | 17 | 0.588 |
| 90 | Arkansas (SEC) | 13 | 9-4 | 15 | 25 | 0.600 |
| 90 | Georgia Tech (ACC) | 12 | 3-9 | 9 | 15 | 0.600 |
| 90 | Kent St. (MAC) | 14 | 7-7 | 21 | 35 | 0.600 |
| 90 | Virginia (ACC) | 12 | 6-6 | 12 | 20 | 0.600 |
| 94 | Kansas St. (Big 12) | 13 | 8-5 | 20 | 33 | 0.606 |
| 95 | Baylor (Big 12) | 14 | 12-2 | 17 | 28 | 0.607 |
| 96 | Kansas (Big 12) | 12 | 2-10 | 11 | 18 | 0.611 |
| 96 | Navy (AAC) | 12 | 4-8 | 11 | 18 | 0.611 |
| 96 | San Jose St. (Mountain West) | 12 | 5-7 | 11 | 18 | 0.611 |
| 99 | North Texas (C-USA) | 13 | 6-7 | 13 | 21 | 0.619 |
| 99 | Vanderbilt (SEC) | 12 | 2-10 | 13 | 21 | 0.619 |
| 101 | Charlotte (C-USA) | 12 | 5-7 | 15 | 24 | 0.625 |
| 101 | Penn St. (Big Ten) | 13 | 7-6 | 15 | 24 | 0.625 |
| 103 | Oklahoma (Big 12) | 13 | 11-2 | 24 | 38 | 0.632 |
| 104 | South Fla. (AAC) | 12 | 2-10 | 14 | 22 | 0.636 |
| 105 | Virginia Tech (ACC) | 13 | 6-7 | 16 | 25 | 0.640 |
| 106 | Colorado St. (Mountain West) | 12 | 3-9 | 11 | 17 | 0.647 |
| 106 | East Carolina (AAC) | 12 | 7-5 | 11 | 17 | 0.647 |
| 108 | Michigan St. (Big Ten) | 13 | 11-2 | 24 | 37 | 0.649 |
| 109 | BYU (FBS Independent) | 13 | 10-3 | 17 | 26 | 0.654 |
| 109 | Memphis (AAC) | 12 | 6-6 | 17 | 26 | 0.654 |
| 111 | Indiana (Big Ten) | 12 | 2-10 | 10 | 15 | 0.667 |
| 111 | LSU (SEC) | 13 | 6-7 | 14 | 21 | 0.667 |
| 111 | Oregon (Pac-12) | 14 | 10-4 | 24 | 36 | 0.667 |
| 111 | Rice (C-USA) | 12 | 4-8 | 12 | 18 | 0.667 |
| 115 | Texas St. (Sun Belt) | 12 | 4-8 | 15 | 22 | 0.682 |
| 115 | Western Mich. (MAC) | 13 | 8-5 | 15 | 22 | 0.682 |
| 117 | Southern California (Pac-12) | 12 | 4-8 | 13 | 19 | 0.684 |
| 118 | Duke (ACC) | 12 | 3-9 | 9 | 13 | 0.692 |
| 119 | Akron (MAC) | 12 | 2-10 | 7 | 10 | 0.700 |
| 119 | Buffalo (MAC) | 12 | 4-8 | 14 | 20 | 0.700 |
| 121 | Troy (Sun Belt) | 12 | 5-7 | 23 | 32 | 0.719 |
| 122 | UConn (FBS Independent) | 12 | 1-11 | 18 | 25 | 0.720 |
| 123 | Illinois (Big Ten) | 12 | 5-7 | 13 | 18 | 0.722 |
| 124 | New Mexico (Mountain West) | 12 | 3-9 | 11 | 15 | 0.733 |
| 124 | Texas Tech (Big 12) | 13 | 7-6 | 22 | 30 | 0.733 |
| 126 | FIU (C-USA) | 12 | 1-11 | 9 | 12 | 0.750 |
| 127 | Temple (AAC) | 12 | 3-9 | 24 | 31 | 0.774 |
| 128 | Tulane (AAC) | 12 | 2-10 | 23 | 29 | 0.793 |
| 129 | Missouri (SEC) | 13 | 6-7 | 18 | 22 | 0.818 |
| 130 | Arkansas St. (Sun Belt) | 12 | 2-10 | 11 | 13 | 0.846 |