Ring Size (US & Canada)
| US Size | Internal Diameter |
| 3 | 14mm |
| 3.5 | 14.5mm |
| 4 | 14.9mm |
| 4.5 | 15.3mm |
| 5 | 15.7mm |
| 5.5 | 16.1mm |
| 6 | 16.5mm |
| 6.5 | 16.9mm |
| 7 | 17.3mm |
| 7.5 | 17.7mm |
| 8 | 18.1mm |
| 8.5 | 18.5mm |
| 9 | 18.9mm |
| 9.5 | 19.4mm |
| 10 | 19.8mm |
| 10.5 | 20.2mm |
| 11 | 20.6mm |
| 11.5 | 21.0mm |
| 12 | 21.4mm |
| 12.5 | 21.8mm |
| 13 | 22.2mm |
Measure Your Finger
- Measure your finger at the end of the day and when your fingers are warm. (Fingers are smaller in the early morning and when cold.) Please also note that the fingers on your dominant hand are usually larger.
- Measure your finger size 3 to 4 times to eliminate an erroneous reading.
- Avoid using string or paper to measure ring size as these materials can stretch or twist, yielding an inaccurate measurement.
- Consider width. The wider the band, the tighter the fit may feel. You may need to go up by half a size for a more comfortable fit.
- Your perfect fit ring should be snug enough that it does not fall off after a good shake of your hand, but loose enough to slide easily over your knuckle.