How to Measure Ring Size ?
Circumference Conversion Chart (Method 1)
| Inner Diameter (mm) | Circumference (mm) | USA/Canada Size |
|---|---|---|
| 14.2 | 44.2 | 3 |
| 14.5 | 45.5 | 3.5 |
| 15.0 | 46.8 | 4 |
| 15.4 | 48.0 | 4.5 |
| 15.8 | 49.3 | 5 |
| 16.2 | 50.6 | 5.5 |
| 16.6 | 51.9 | 6 |
| 17.0 | 53.1 | 6.5 |
| 17.4 | 54.4 | 7 |
| 17.8 | 55.7 | 7.5 |
| 18.2 | 57.0 | 8 |
| 18.6 | 58.3 | 8.5 |
| 19.0 | 59.5 | 9 |
| 19.4 | 60.8 | 9.5 |
| 19.8 | 62.1 | 10 |
| 20.2 | 63.4 | 10.5 |
| 20.6 | 64.6 | 11 |
| 21.0 | 65.9 | 11.5 |
Circumference Conversion Chart (Method 2)
| Inner Diameter (mm) | Circumference (mm) | USA/Canada Size |
|---|---|---|
| 14.2 | 44.2 | 3 |
| 14.5 | 45.5 | 3.5 |
| 15.0 | 46.8 | 4 |
| 15.4 | 48.0 | 4.5 |
| 15.8 | 49.3 | 5 |
| 16.2 | 50.6 | 5.5 |
| 16.6 | 51.9 | 6 |
| 17.0 | 53.1 | 6.5 |
| 17.4 | 54.4 | 7 |
| 17.8 | 55.7 | 7.5 |
| 18.2 | 57.0 | 8 |
| 18.6 | 58.3 | 8.5 |
| 19.0 | 59.5 | 9 |
| 19.4 | 60.8 | 9.5 |
| 19.8 | 62.1 | 10 |
| 20.2 | 63.4 | 10.5 |
| 20.6 | 64.6 | 11 |
| 21.0 | 65.9 | 11.5 |