Size Guide
- Yes – measure ring
- No – measure finger
To determine your ring size, do the following:
- Select an existing ring that fits the desired finger.
- Measure the internal diameter of the ring (in mm).
- Use the chart below to determine your ring size.
| Internal Diameter (mm) | UK Size | EU Size | US Size |
|---|---|---|---|
| 15.5 | J | 49 | 5 |
| 15.7 | J 1/2 | – | – |
| 15.9 | K | 50 | 5 1/2 |
| 16.1 | K 1/2 | 51 | – |
| 16.3 | L | 52 | 6 |
| 16.5 | L 1/2 | – | – |
| 16.7 | M | 53 | 6 1/2 |
| 16.9 | M 1/2 | – | – |
| 17.1 | N | 54 | 7 |
| 17.3 | N 1/2 | – | – |
| 17.5 | O | 55 | 7 1/2 |
| 17.7 | O 1/2 | 56 | – |
| 17.9 | P | 57 | 8 |
| 18.1 | P 1/2 | – | – |
| 18.3 | Q | 58 | 8 1/2 |
| 18.5 | Q 1/2 | – | – |
| 18.8 | R | 59 | 9 |
| 19.0 | R 1/2 | 60 | – |
| 19.2 | S | 61 | 9 1/2 |
| 19.4 | S 1/2 | – | – |
| 19.6 | T | 62 | 10 |
| 19.8 | T 1/2 | – | – |
| 20.0 | U | 63 | 10 1/2 |
| 20.2 | U 1/2 | 64 | – |
| 20.4 | V | 65 | 11 |
| 20.6 | V 1/2 | – | – |
| 20.8 | W | 66 | 11 1/2 |
| 21.0 | W 1/2 | – | – |
| 21.2 | X | 67 | 12 |
| 21.4 | X 1/2 | – | – |
| 21.6 | Y | 68 | 12 1/2 |