US to UK ring size
US uses numbers, the UK uses letters. A US 7 is a UK N½.
US to UK ring size chart
| US | UK | EU/ISO (mm) | Inner Ø |
|---|---|---|---|
| 5 | J½ | 49.3 | 15.7 mm |
| 6 | L½ | 51.9 | 16.5 mm |
| 7 | N½ | 54.4 | 17.3 mm |
| 8 | Q | 57.0 | 18.1 mm |
| 9 | R½ | 59.5 | 18.9 mm |
| 10 | T½ | 62.1 | 19.8 mm |
UK sizes run in half-letter steps, so US whole sizes often land on a UK half size. The EU/ISO number is the inner circumference in mm.
Frequently asked questions
What is a US 7 ring in UK size?
A UK N½.
What is a US 8 ring in UK?
A UK Q.
How do US and UK ring sizes differ?
US uses numbers, UK uses letters in half-letter steps. Both map to the same mm circumference.