| Men's Size | Women's Size | Kids Size | Birkenstock Size |
| 6-6.5 | 24 | ||
| 7-7.5 | 25 | ||
| 8-8.5 | 26 | ||
| 9-9.5 | 27 | ||
| 10-10.5 | 28 | ||
| 11-11.5 | 29 | ||
| 12-12.5 | 30 | ||
| 13-13.5 | 31 | ||
| 1-1.5 | 32 | ||
| 2-2.5 | 2-2.5 | 33 | |
| 3-3.5 | 3-3.5 | 34 | |
| 4-4.5 | 4-4.5 | 35 | |
| 5-5.5 | 5-5.5 | 36 | |
| 6-6.5 | 6-6.5 | 37 | |
| 5-5.5 | 7-7.5 | 38 | |
| 6-6.5 | 8-8.5 | 39 | |
| 7-7.5 | 9-9.5 | 40 | |
| 8-8.5 | 10-10.5 | 41 | |
| 9-9.5 | 11-11.5 | 42 | |
| 10-10.5 | 12-12.5 | 43 | |
| 11-11.5 | 13-13.5 | 44 | |
| 12-12.5 | 45 | ||
| 13-13.5 | 46 | ||
| 14-14.5 | 47 | ||
| 15-15.5 | 48 | ||
| 16-16.5 | 49 | ||
| 17-17.5 | 50 |
| Women's American Width Equivalent | Men's American Width Equivalent | |
| Regular | D - EE | C - D |
| Narrow | B - C | A - B |