Ring Size to Millimeter Converter
Convert ring sizes between different international standards and millimeters. Ring sizes vary by country and region. This tool helps you find the perfect fit.
| US Size | UK Size | EU Size | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|
| 3 | F | 44 | 14.1 | 44.2 |
| 4 | H | 47 | 14.9 | 46.8 |
| 5 | J | 50 | 15.7 | 49.3 |
| 6 | L | 51 | 16.5 | 51.9 |
| 7 | N | 54 | 17.3 | 54.4 |
| 8 | P | 57 | 18.1 | 56.9 |
| 9 | R | 60 | 18.9 | 59.5 |
| 10 | T | 62 | 19.8 | 62.1 |
| 11 | V | 65 | 20.6 | 64.6 |
| 12 | X | 67 | 21.4 | 67.2 |