Ring Sizes Around ISO 70
| US | UK | ISO / EU | JP / KR | Diameter (mm) | Circumference (mm) |
| 11.5 | W | 66 | 25 | 21 | 65.9 |
| 12 | X | 67 | 26 | 21.4 | 67.2 |
| 12.5 | Y | 68 | 27 | 21.8 | 68.5 |
| 13 | Z | 70 | 28 | 22.2 | 69.7 |
| 13.5 | Z1 | 71 | 28+ | 22.6 | 71 |
| 14 | Z2 | 72 | 28+ | 23 | 72.3 |
Frequently Asked Questions
Does ISO 70 round up or down in UK?
Size for the knuckle and the evening; large fingers swell most, so a 13 that fits a cool morning can be genuinely hard to remove by night.
See a number that looks off? Report an error on this page.