RING SIZES
RING SIZE (UK) | APPROX EU SIZE | INSIDE DIAMETER | INSIDE CIRCUMFERENCE |
| A | N/A | 11.9mm | 37.8mm |
| B | N/A | 12.4mm | 39.1mm |
| C | 40 1/2 | 12.8mm | 40.4mm |
| D | 41 1/2 | 13.2mm | 41.7mm |
| E | 42 3/4 | 13.6mm | 42.9mm |
| F | 44 1/2 | 14mm | 44.2mm |
| G | 45 1/2 | 14.4mm | 45.5mm |
| H | 46 1/2 | 14.9mm | 46.8mm |
| I | 47 3/4 | 15.3mm | 48mm |
| J | 49 1/2 | 15.5mm | 48.7mm |
| K | 50 1/4 | 15.9mm | 50mm |
| L | 51 1/2 | 16.3mm | 51.2mm |
| M | 52 1/2 | 16.7mm | 52.5mm |
| N | 54 | 17.1mm | 53.8mm |
| O | 55 1/4 | 17.5mm | 55.1mm |
| P | 56 1/4 | 17.9mm | 56.3mm |
| Q | 57 1/2 | 18.3mm | 57.6mm |
| R | 58 1/2 | 18.7mm | 58.9mm |
| S | 60 | 19.2mm | 60.2mm |
| T | 61 1/2 | 19.6mm | 61.4mm |
| U | 62 1/2 | 20mm | 62.7mm |
| V | 63 3/4 | 20.4mm | 64mm |
| W | 65 1/4 | 20.8mm | 65.3mm |
| X | 66 1/4 | 21.2mm | 66.6mm |
| Y | 67 1/2 | 21.6mm | 67.8mm |
| Z | 68 3/4 | 21.8mm | 68.5mm |