Common values
| Diameter (mm) | US | UK | EU |
|---|---|---|---|
| 15.7 | 5 | J 1/2 | 49.3 |
| 16.5 | 6 | L 1/2 | 51.9 |
| 17.3 | 7 | N 1/2 | 54.4 |
| 18.1 | 8 | P 1/2 | 57.0 |
Common questions
How do I measure my ring size?
Measure the inside diameter of a ring that fits, or wrap a strip around your finger to get the circumference, then convert.
How much does a US size change the diameter?
Each full US size adds about 0.81 mm to the inside diameter.