Ring size
The EU ring size is the inner circumference of the ring in millimeters, so the diameter follows from circumference / π (for example, EU 57 ≈ 18.1 mm). US sizes are numbers and UK sizes are letters. The most accurate way to find your size is to measure the inner circumference of a ring that fits well.
Size chart
| EU | Ø mm | US | UK |
|---|---|---|---|
| 47 | 15 | 4 | H |
| 49 | 15.6 | 5 | J½ |
| 52 | 16.6 | 6 | L½ |
| 54 | 17.2 | 7 | N½ |
| 57 | 18.1 | 8 | P½ |
| 59 | 18.8 | 9 | R½ |
| 62 | 19.7 | 10 | T½ |
| 64 | 20.4 | 11 | V½ |
| 67 | 21.3 | 12 | Y |