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US and EU sizes comparisons, accurate to within approximately 1/4 of a finger size
For further reading we have written a blog post with lots of useful tips on finding the perfect ring size
| UK Size | Approx US Size | Approx EU Size | mm ring diameter | mm ring or finger circumference |
| C | 1 3/4 | 40 1/2 | 12.9 | 40.5 |
| D | 2 1/4 | 41 1/2 | 13.3 | 41.2 |
| E | 2 3/4 | 42 3/4 | 13.7 | 43 |
| F | 3 1/4 | 44 1/2 | 14.1 | 44.3 |
| G | 3 3/4 | 45 1/2 | 14.5 | 45.6 |
| H | 4 1/4 | 46 1/2 | 14.9 | 46.8 |
| I | 4 3/4 | 47 3/4 | 15.3 | 48.1 |
| J | 5 1/4 | 49 1/2 | 15.5 | 48.7 |
| K | 5 1/2 | 50 1/4 | 15.9 | 49.9 |
| L | 6 | 51 1/2 | 16.3 | 51.2 |
| M | 6 1/2 | 52 1/2 | 16.7 | 52.5 |
| N | 7 | 54 | 17.1 | 53.7 |
| O | 7 1/2 | 55 1/4 | 17.5 | 55 |
| P | 8 | 56 1/4 | 17.9 | 56.2 |
| Q | 8 1/2 | 57 1/2 | 18.3 | 57.5 |
| R | 8 3/4 | 58 1/2 | 18.8 | 59 |
| S | 9 1/2 | 60 1/4 | 19.2 | 60.3 |
| T | 9 3/4 | 61 1/2 | 19.6 | 61.6 |
| U | 10 1/4 | 62 1/2 | 20 | 62.8 |
| V | 10 3/4 | 63 3/4 | 20.4 | 64.1 |
| W | 11 1/4 | 65 1/4 | 20.8 | 65.3 |
| X | 11 3/4 | 66 1/4 | 21.2 | 66.6 |
| Y | 12 1/4 | 67 1/2 | 21.6 | 67.9 |
| Z | 12 3/4 | 68 3/4 | 21.8 | 68.5 |
