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Below you'll find a conversion chart for ring sizes. Please note that this is only a guide, and ring sizes will vary depending on ring width and style.
If your desired ring size is in between two of our standard available sizes, we recommend you pick up to one size bigger if the ring you’re purchasing has a wide band, otherwise, try picking the closest available size for rings that have a normal or narrow band.
| Inside Circumference | Sizes | |||
| MM | Inches |
US & Canada (We use this size) |
U.K, NewZealand & Australia |
China & Japan |
| 46.7 | 1.84 | 4 | H 1/2 | 7 |
| 47.3 | 1.86 | 4.5 | I 1/2 | 8 |
| 49.3 | 1.94 | 5 | J 1/2 | 9 |
| 50.6 | 1.99 | 5.5 | L | 10 |
| 51.9 | 2.04 | 6 | M | 12 |
| 53.2 | 2.09 | 6.5 | N | 13 |
| 54.5 | 2.15 | 7 | O | 14 |
| 55.8 | 2.2 | 7.5 | P | 15 |
| 57.2 | 2.25 | 8 | Q | 16 |
| 58.2 | 2.29 | 8.5 | Q 1/2 | 17 |
| 59.5 | 2.35 | 9 | R 1/2 | 18 |
| 61.0 | 2.40 | 9.5 | S 1/2 | 19 |
| 62.3 | 2.45 | 10 | T 1/2 | 20 |
| 63.5 | 2.50 | 10.5 | U 1/2 | 22 |
| 65.0 | 2.56 | 11 | V 1/2 | 23 |
| 66.2 | 2.61 | 11.5 | W 1/2 | 24 |
| 67.5 | 2.66 | 12 | Y | 25 |
| 68.8 | 2.71 | 12.5 | Z | 26 |
| 70.2 | 2.76 | 13 | Z+1 | 27 |
| 72 | 2.80 | 13.5 | Z+2 | - |
| 73 | 2.87 | 14 | Z+3 | - |
| 74 | 2.91 | 14.5 | Z+4 | - |
| 75 | 2.95 | 15 | Z+5 | - |
| 76 | 2.87 | 15.5 | Z+6 | - |
| 77 | 2.90 | 16 | Z+7 | - |
