Commonwealth Sizing
UK, Australia & NZ Ring Size Chart
The UK, Australia, New Zealand, Ireland, and Canada all share a unique alphabetical sizing system running from A to Z+.
Use the chart below to find your letter size based on millimeter measurements, or convert a US number into a UK letter.
| UK / AU Size | Circumference (mm) | US Equivalent |
|---|---|---|
| H | 46.8 | 4 |
| J | 48.7 | 4.75 |
| L | 51.2 | 5.75 |
| N | 53.8 | 6.75 |
| P | 56.3 | 7.75 |
| R | 58.9 | 8.75 |
| T | 61.4 | 9.75 |
| V | 64.0 | 10.75 |
| Z | 68.5 | 12.5 |
Written by Evelyn Moore
Evelyn is a certified GIA Gemologist with over a decade of experience in fine jewelry sizing and design. She ensures all conversion charts and measuring advice strictly adhere to ISO 8653 standards.