Standard Ring Size Conversion
Here at Quidcart, our ring sizes are specified in standard UK sizing. For ease, we have also illustrated the conversions to Europe, US and China brand sizing, to ensure that you choose the perfect size for you.
| Circumference | Inside Diameter | Ring Size | ||||
|---|---|---|---|---|---|---|
| (mm) | (mm) | UK | Europe | US | China | |
| 37.8mm | 11.9mm | A | - | 1/2 | - | |
| 39.1mm | 12.3mm | B | - | 1 | - | |
| 40.4mm | 12.7mm | C | - | 1 1/2 | - | |
| 41.7mm | 13.1mm | D | 41 1/2 | 2 | - | |
| 42.9mm | 13.5mm | E | 42 3/4 | 2 1/2 | - | |
| 44.2mm | 13.9mm | F | 44 | 3 | - | |
| 45.5mm | 14.3mm | G | 45 1/4 | 3 3/8 | - | |
| 46.8mm | 14.7mm | H | 46 1/2 | 3 3/4 | 8 | |
| 48.0mm | 15.1mm | I | 47 3/4 | 4 1/4 | 9 | |
| 48.7mm | 15.5mm | J | 49 | 4 5/8 | 10 | |
| 50.0mm | 15.9mm | K | 50 | 5 1/8 | 11 | |
| 51.2mm | 16.3mm | L | 51 3/4 | 5 1/2 | 12 | |
| 52.5mm | 16.7mm | M | 52 3/4 | 6 | 13 | |
| 53.8mm | 17.1mm | N | 54 | 6 1/2 | - | |
| 55.1mm | 17.5mm | O | 55 1/4 | 7 | - | |
| 56.3mm | 17.9mm | P | 56 1/2 | 7 1/2 | 17 | |
| 57.2mm | 18.2mm | Q | 57 3/4 | 8 | 18 | |
| 58.9mm | 18.6mm | R | 59 | 8 5/8 | 19 | |
| 60.2mm | 19.1mm | S | 60 1/4 | 9 1/8 | 20 | |
| 61.4mm | 19.5mm | T | 61 1/2 | 9 5/8 | 21 | |
| 62.7mm | 20.0mm | U | 62 3/4 | 10 1/4 | 23 | |
| 64.0mm | 20.3mm | V | 63 | 10 5/8 | 24 | |
| 65.3mm | 20.7mm | W | 65 | 11 1/8 | 25 | |
| 66.6mm | 21.1mm | X | 66 1/4 | 11 5/8 | 26 | |
| 67.8mm | 21.5mm | Y | 67 1/2 | 12 | 27 | |
| 68.5mm | 21.5mm | Z | 68 3/4 | 12 | 28 | |