US sizes also apply to Canada. UK sizes also apply to Australia. EU equivalents are approximate.
Ring size conversion chart
| US / CA | UK / AU | EU ≈ | Inner diameter (mm) | Inner circumference (mm) |
|---|---|---|---|---|
| 6 | L | 52 | 16.5 | 51.8 |
| 6.5 | M | 53 | 16.9 | 53.1 |
| 7 | N | 54 | 17.3 | 54.3 |
| 7.5 | O | 56 | 17.7 | 55.6 |
| 8 | P | 57 | 18.1 | 56.9 |
| 8.5 | Q | 58 | 18.5 | 58.1 |
| 9 | R | 60 | 19.0 | 59.7 |
| 9.5 | S | 61 | 19.4 | 60.9 |
| 10 | T | 62 | 19.8 | 62.2 |
| 10.5 | U | 64 | 20.2 | 63.5 |
| 11 | V | 65 | 20.6 | 64.7 |
| 11.5 | W | 66 | 21.0 | 66.0 |
| 12 | X | 67 | 21.4 | 67.2 |
| 12.5 | Y | 69 | 21.8 | 68.5 |
| 13 | Z½ | 70 | 22.2 | 69.7 |
How to choose your size
Measure a ring that fits the intended finger, or have your finger measured by a jeweller. Compare with the seller’s measurements before ordering. This chart is a reference; conversions can vary between sizing systems.