Rot-Weiß Oberhausen played 67 league seasons and cup tournaments in the data, 1936 to 2019. Success weighs every finish by how hard that competition was to win; Efficiency is the share of what the club could have won that it did win; Edge compares that with an average participant (×1.00).
| 580 | Levski Sofia (BUL) | 4.4 |
| 581 | Burgos CF (Spain) | 4.4 |
| 582 | Wrexham (England) | 4.4 |
| 583 | Rot-Weiß Oberhausen (Germany) | 4.4 |
| 584 | The Strongest (BOL) | 4.4 |
| 585 | Casale (Italy) | 4.3 |
| 586 | Varzim SC (Portugal) | 4.3 |