Regular Width Size Guide * American Width Equivalent / Women C-D /Men D-EE
Narrow Width Size Guide * American Width Equivalent / Women A-B /Men B-C
| Men's | Women's | Birkenstock Size |
| 5-5.5 | 35 | |
| 6-6.5 | 36 | |
| 7-7.5 | 37 | |
| 8-8.5 | 38 | |
| 7 - 7.5 | 9-9.5 | 39 |
| 8 | 10 | 40 |
| 10.5 | 40 | |
| 8.5 | 11 | 41 |
| 11.5 | 41 | |
| 9 | 12 | 42 |
| 9.5 | 42 | |
| 10-10.5 | 43 | |
| 11-11.5 | 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 |
| Men's | Women's | Birkenstock Size |
| 5-5.5 | 36 | |
| 6-6.5 | 37 | |
| 7-7.5 | 38 | |
| 7 - 7.5 | 8-8.5 | 39 |
| 8 | 9 | 40 |
| 9.5 | 40 | |
| 8.5 | 10 | 41 |
| 10.5 | 41 | |
| 9-9.5 | 11-11.5 | 42 |
| 10 | 12 | 42 |
| 10.5 | 43 | |
| 11-11.5 | 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 |