Ring Size Guide
| Inside Diameter (mm) | Inside Circumference (mm) | UK/Ireland Ring Sizes | US/Canada Ring Sizes | EU Ring Sizes |
| 14.65 | 46.02 | H | 3 3/4 | 46 1/2 |
| 15.04 | 47.25 | I | 4 1/4 | 47 3/4 |
| 15.40 | 48.38 | J | 4 5/8 | 49 |
| 15.80 | 49.64 | K | 5 1/8 | 50 |
| 16.10 | 50.58 | L | 5 1/2 | 51 3/4 |
| 16.51 | 51.87 | M | 6 | 52 3/4 |
| 16.92 | 53.16 | N | 6 1/2 | 54 |
| 17.35 | 54.51 | O | 7 | 55 1/4 |
| 17.75 | 55.76 | P | 7 1/2 | 56 1/2 |
| 18.19 | 57.15 | Q | 8 | 57 3/4 |
| 18.61 | 58.47 | R | 8 5/8 | 59 |
| 19.10 | 60.00 | S | 9 1/8 | 60 1/4 |
| 19.51 | 61.29 | T | 9 5/8 | 61 1/2 |
| 20.02 | 62.89 | U | 10 1/4 | 62 3/4 |
| 20.32 | 63.84 | V | 10 5/8 | 63 |
| 20.76 | 65.22 | W | 11 1/8 | 65 |
| 21.18 | 66.54 | X | 11 5/8 | 66 1/4 |
| 21.49 | 67.51 | Y | 12 | 67 1/2 |
| 21.89 | 68.77 | V | 12 1/2 | 68 3/4 |