Size Guide
| Ring Size (US) | Inside Diameter (mm) | Inside Circumference (mm) |
|---|---|---|
| 3 | 14.05 | 44.14 |
| 3.5 | 14.45 | 45.40 |
| 4 | 14.86 | 46.68 |
| 4.5 | 15.27 | 47.97 |
| 5 | 15.70 | 49.32 |
| 5.5 | 16.10 | 50.58 |
| 6 | 16.51 | 51.87 |
| 6.5 | 16.92 | 53.16 |
| 7 | 17.35 | 54.51 |
| 7.5 | 17.75 | 55.76 |
| 8 | 18.19 | 57.15 |
| 8.5 | 18.53 | 58.21 |
| 9 | 18.89 | 59.34 |
| 9.5 | 19.41 | 60.98 |
| 10 | 19.84 | 62.33 |
| 10.5 | 20.20 | 63.46 |
| 11 | 20.68 | 64.97 |
| 11.5 | 21.08 | 66.22 |
| 12 | 21.49 | 67.51 |
| 12.5 | 21.89 | 68.77 |
| 13 | 22.33 | 70.15 |
This table provides the standard US ring sizes along with their corresponding inside diameters and circumferences in millimeters.