RING SIZE GUIDE
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| Alphabetical Sizes Australia, NZ, UK | Numerical Sizes US, Canada, Asia | Inside Diameter mm | Inside Circumference mm |
|---|---|---|---|
| J | 4 3/4 | 15.5 mm | 48.7 mm |
| J 1/2 | 5 | 15.7 mm | 49.3 mm |
| K | 5 1/4 | 15.9 mm | 49.9 mm |
| K 1/2 | 5 1/2 | 16.1 mm | 50.6 mm |
| L | 5 3/4 | 16.3 mm | 51.2 mm |
| L 1/2 | 6 | 16.5 mm | 51.8 mm |
| M | 6 1/4 | 16.7 mm | 52.5 mm |
| M 1/2 | 6 1/2 | 16.9 mm | 53.1 mm |
| N | 6 3/4 | 17.1 mm | 53.8 mm |
| N 1/2 | 7 | 17.3 mm | 54.4 mm |
| O | 7 1/4 | 17.5 mm | 55 mm |
| O 1/2 | 7 1/2 | 17.7 mm | 55.7 mm |
| P | 7 3/4 | 17.9 mm | 56.3 mm |
| P 1/2 | 8 | 18.1 mm | 56.9 mm |
| Q | 8 1/4 | 18.3 mm | 57.6 mm |
| Q 1/2 | 8 1/2 | 18.5 mm | 58.2 mm |
| R | 8 3/4 | 18.7 mm | 58.9 mm |
| R 1/2 | 9 | 18.9 mm | 59.5 mm |
| S | 9 1/4 | 19.2 mm | 60.1 mm |
| S 1/2 | 9 1/2 | 19.4 mm | 60.8 mm |
| T | 9 3/4 | 19.6 mm | 61.4 mm |
| T 1/2 | 10 | 19.8 mm | 62.1 mm |
| U | 10 1/4 | 20 mm | 62.7 mm |
| U 1/2 | 10 1/2 | 20.2 mm | 63.3 mm |
| V | 10 3/4 | 20.4 mm | 64 mm |
| V 1/2 | 11 | 20.6 mm | 64.6 mm |
| W | 11 1/4 | 20.8 mm | 65.2 mm |
| W 1/2 | 11 1/2 | 21 mm | 65.9 mm |
| X | 11 3/4 | 21.2 mm | 66.5 mm |
| X 1/2 | 12 | 21.4 mm | 67.2 mm |
| Y | 12 1/4 | 21.6 mm | 67.8 mm |
| Z | 12 1/2 | 21.8 mm | 68.4 mm |
| Z 1/2 | 12 3/4 | 22 mm | 69.1 mm |
| 13 | 22.2 mm | 69.7 mm | |
| Z1 | 13 1/4 | 22.4 mm | 70.3 mm |
| 13 1/2 | 22.6 mm | 71 mm | |
| Z2 | 13 3/4 | 22.8 mm | 71.6 mm |