Rings Size Guide
| UK Size | US/Canada Size | Australia/NZ Size | Inside Diameter (mm) | Inside Circumference (mm) |
|---|---|---|---|---|
| D | 2.25 | D | 13.26 | 41.5 |
| E | 2.75 | E | 13.61 | 42.8 |
| F | 3.25 | F | 13.97 | 43.9 |
| G | 3.75 | G | 14.30 | 45.0 |
| H | 4.25 | H | 14.64 | 46.0 |
| I | 4.5 | I | 15.04 | 47.2 |
| J | 5 | J | 15.40 | 48.4 |
| K | 5.5 | K | 15.80 | 49.6 |
| L | 6 | L | 16.10 | 50.6 |
| M | 6.5 | M | 16.50 | 51.8 |
| N | 7 | N | 16.90 | 53.1 |
| O | 7.5 | O | 17.30 | 54.4 |
| P | 8 | P | 17.70 | 55.7 |
| Q | 8.5 | Q | 18.10 | 56.9 |
| R | 9 | R | 18.50 | 58.1 |
| S | 9.5 | S | 19.10 | 60.0 |
| T | 10 | T | 19.50 | 61.3 |
| U | 10.5 | U | 19.90 | 62.5 |
| V | 11 | V | 20.30 | 63.8 |
| W | 11.5 | W | 20.70 | 65.0 |
| X | 12 | X | 21.00 | 66.0 |
| Y | 12.5 | Y | 21.40 | 67.2 |
| Z | 13 | Z | 21.80 | 68.5 |
💡 Notes:
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USA, Canada, Australia, and New Zealand generally use the same sizing (numeric).
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The UK uses alphabetical sizing (A–Z).
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Measure the inside diameter of a ring that fits well or wrap a strip of paper around your finger and measure the circumference.