Women's Size Guide
| UK | US | EU | Inside Diameter (MM) | Inside Circumference (MM) |
| I | 4 | 47 | 15.29 | 48 |
| J | 4 3/4 | 48 | 15.49 | 48.7 |
| J 1/2 | 5 | 49 | 15.7 | 49.3 |
| K | 5 3/8 | 50 | 16 | 50.3 |
| L | 5 3/4 | 51 | 16.31 | 51.2 |
| M | 6 | 52 | 16.71 | 52.5 |
| N | 6 3/4 | 53 | 17.12 | 53.8 |
| N 1/2 | 7 | 54 | 17.32 | 54.4 |
| O | 7 1/4 | 55 | 17.53 | 55.1 |
| P | 7 3/4 | 56 | 17.93 | 56.3 |
| Q | 8 | 57 | 18.34 | 57.6 |
| Q 1/2 | 8 1/2 | 58 | 18.54 | 58.2 |
| R | 9 | 59 | 18.95 | 59.5 |
| S | 9 3/8 | 60 | 19.25 | 60.5 |