| Ring Size | Circumference(mm) | UK,Europe & Australia | CN/SG/JP | HK | Switzerland |
|---|
| 4 | 46.8 | H | 7 | 8 | 6.75 |
| 4.25 | 47.6 | H 1/2 | 7.5 | 8.5 | 7.5 |
| 4.5 | 48 | I | 8 | 9 | 8 |
| 4.75 | 48.8 | I 1/2 | 8.5 | 9.8 | 8.75 |
| 5 | 49.6 | J 1/4 | 9.5 | 10.5 | 9.25 |
| 5.25 | 50.2 | J 3/4 | 10 | 11 | 10 |
| 5.5 | 50.7 | K | 10.5 | 11.5 | 10.5 |
| 5.75 | 51.2 | K 1/2 | 11 | 12 | 11.25 |
| 6 | 51.8 | L | 11.5 | 12.5 | 11.75 |
| 6.25 | 52.6 | L 1/2 | 12 | 13 | 12.5 |
| 6.5 | 53.1 | M | 12.8 | 14 | 13.25 |
| 6.75 | 53.7 | M 1/2 | 13.5 | 14.25 | 13.75 |
| 7 | 54.3 | N | 14 | 14.75 | 14.5 |
| 7.25 | 54.8 | N 1/4 | 14.25 | 15 | 15 |
| 7.5 | 55.4 | N 3/4 | 15 | 16 | 15.75 |
| 7.75 | 56.2 | O 1/2 | 15.75 | 16.5 | 16.25 |
| 8 | 56.8 | P | 16.3 | 17 | 17 |
| 8.25 | 57.6 | P 1/2 | 17 | 17.5 | 17.5 |
| 8.5 | 58.1 | Q | 17.5 | 18 | 18.25 |
| 8.75 | 58.9 | R | 18 | 19 | 19 |
| 9 | 59.3 | R 1/4 | 18.75 | 19.25 | 19.5 |
| 9.25 | 60.1 | S | 19.5 | 20 | 20.25 |
| 9.5 | 60.3 | S 1/4 | 20 | 20.5 | 20.75 |
| 9.75 | 61.2 | S 3/4 | 20.5 | 21 | 21.5 |
| 10 | 61.9 | T 1/4 | 21 | 21.75 | 22 |
| 10.25 | 62.5 | T 3/4 | 21.85 | 22.25 | 22.75 |
| 10.5 | 63.3 | U 1/2 | 22.5 | 23 | 23.25 |
| 10.75 | 64.1 | V | 23.25 | 23.75 | 24 |
| 11 | 64.7 | V 1/2 | 23.75 | 24.25 | 24.75 |
| 11.25 | 65.3 | W | 24.25 | 24.75 | 25.25 |
| 11.5 | 65.9 | W 1/2 | 25 | 25.25 | 26 |
| 11.75 | 66.4 | X | 25.5 | 26 | 26.5 |
| 12 | 67.2 | X 1/4 | 25.75 | 26.25 | 27.25 |
