Rings Sizeguide
| UK | US / Canada | France / Russia | Switzerland | Inside Circ mm | Inside Dia mm |
|---|---|---|---|---|---|
| E | 2 1/2 | 42.75 | 2.75 | 42.76 | 13.61 |
| F | 3 | 44 | 4 | 44.14 | 14.05 |
| G | 3 3/8 | 45.25 | 5.25 | 45.11 | 14.36 |
| H | 3 3/4 | 46.5 | 6.5 | 46.02 | 14.65 |
| I | 4 1/4 | 47.75 | 7.75 | 47.25 | 15.04 |
| J | 4 5/8 | 49 | 9 | 48.38 | 15.40 |
| K | 5 T/8 | 50 | 10 | 49.64 | 15.80 |
| L | 5 T/2 | 51.75 | 11.75 | 50.58 | 16.10 |
| M | 6 | 52.75 | 12.75 | 51.87 | 16.51 |
| N | 6 1/2 | 54 | 14 | 53.16 | 16.92 |
| O | 7 | 55.25 | 15.25 | 54.51 | 17.35 |
| P | 7 1/2 | 56.5 | 16.5 | 55.76 | 17.75 |
| Q | 8 | 57.75 | 17.75 | 57.15 | 18.19 |
| R | 8 5/8 | 59 | 19 | 58.47 | 18.61 |
| S | 9 T/8 | 60.25 | 20.25 | 60.00 | 19.10 |
| T | 9 5/8 | 61.5 | 21.5 | 61.29 | 19.51 |
| U | 10 1/4 | 62.75 | 22.75 | 62.89 | 20.02 |
| V | 10 5/8 | 63 | 23.75 | 63.84 | 20.32 |
| W | 11 1/8 | 65 | 25 | 65.22 | 20.76 |
| X | 11 5/8 | 66.25 | 26.25 | 66.54 | 21.18 |