| Inside Diameter | EU Ring Size | US Ring Size Equivalent |
|---|---|---|
| 14mm | 44 | 3 |
| 14.1mm | 44 5/8 | 3 1/4 |
| 14.4mm | 45 1/4 | 3 1/2 |
| 14.6mm | 45 7/8 | 3 3/4 |
| 14.9mm | 46 1/2 | 4 |
| 15.0mm | 47 1/8 | 4 1/4 |
| 15.3mm | 47 3/4 | 4 1/2 |
| 15.6mm | 48 3/8 | 4 3/4 |
| 15.8mm | 49 | 5 |
| 16.0mm | 49 5/8 | 5 1/4 |
| 16.1mm | 50 1/4 | 5 1/2 |
| 16.3mm | 50 7/8 | 5 3/4 |
| 16.4mm | 51 1/2 | 6 |
| 16.9mm | 52 1/8 | 6 1/4 |
| 17.0mm | 52 3/4 | 6 1/2 |
| 17.1mm | 53 3/8 | 6 3/4 |
| 17.2mm | 54 | 7 |
| 17.5mm | 54 5/8 | 7 1/4 |
| 17.9mm | 55 1/2 | 7 1/2 |
| 18.0mm | 55 7/8 | 7 3/4 |
| 18.1mm | 56 3/4 | 8 |
| 18.3mm | 57 1/8 | 8 1/4 |
| 18.6mm | 58 | 8 1/2 |
| 18.9mm | 58 3/8 | 8 3/4 |
| 19.0mm | 59 | 9 |
| 19.1mm | 59 5/8 | 9 1/4 |
| 19.4mm | 60 1/4 | 9 1/2 |
| 19.7mm | 60 7/8 | 9 3/4 |
| 19.9mm | 61 1/2 | 10 |
| 20mm | 62 1/8 | 10 1/4 |
