UK Ring Size Guide
The United Kingdom uses an alphabetical ring sizing system that ranges from letters A to Z with half sizes noted with a "½" symbol (e.g., "L½"). This system is also used in Australia and other Commonwealth countries. Our guide provides detailed information about the UK sizing standards and practical measurement guidance.
UK Ring Size Chart
| UK Size | US Size | Inside Diameter (mm) | Inside Circumference (mm) |
|---|---|---|---|
| A | ½ | 12.04 | 37.8 |
| B | 1 | 12.45 | 39.1 |
| C | 1½ | 12.85 | 40.4 |
| D | 2 | 13.26 | 41.7 |
| E | 2½ | 13.67 | 42.9 |
| F | 3 | 14.07 | 44.2 |
| G | 3½ | 14.48 | 45.5 |
| H | 4 | 14.88 | 46.8 |
| I | 4½ | 15.29 | 48.0 |
| J | 5 | 15.70 | 49.3 |
| K | 5½ | 16.10 | 50.6 |
| L | 6 | 16.51 | 51.9 |
| M | 6½ | 16.92 | 53.1 |
| N | 7 | 17.32 | 54.4 |
| O | 7½ | 17.73 | 55.7 |
| P | 8 | 18.14 | 57.0 |
| Q | 8½ | 18.54 | 58.3 |
| R | 9 | 18.95 | 59.5 |
| S | 9½ | 19.35 | 60.8 |
| T | 10 | 19.76 | 62.1 |
| U | 10½ | 20.17 | 63.4 |
| V | 11 | 20.57 | 64.6 |
| W | 11½ | 20.98 | 65.9 |
| X | 12 | 21.39 | 67.2 |
| Y | 12½ | 21.79 | 68.5 |
| Z | 13 | 22.20 | 69.7 |
Understanding UK Ring Sizes
The UK ring sizing system uses letters of the alphabet, with half sizes available for a more precise fit. Each full size represents a difference of approximately 0.4mm in diameter or 1.25mm in circumference. Here are key facts about UK sizing:
- Common Women's Sizes: Typically range from size H to P, with the average being around L
- Common Men's Sizes: Usually range from size R to Z, with the average being around T to U
- Half Sizes: Denoted with a "½" after the letter (e.g., "K½") for more precise fitting
- International Usage: This system is used throughout the UK, Australia, Ireland, South Africa and other Commonwealth nations
How to Measure for UK Ring Sizes
To determine your UK ring size, you can use several methods:
Using a UK Ring Sizer
British jewelers typically use ring sizer tools that directly give UK letter sizes. These can be plastic or metal rings that you try on.
Converting from Measurements
If you know your finger's circumference in millimeters, you can use our chart above to find your UK letter size.
Converting from Other Systems
If you know your size in another system (like US), you can convert to UK sizing using our chart or conversion calculator.
UK Ring Sizing Tips
- Temperature affects finger size - measure in normal temperature conditions
- Wider bands may require going up a half size for comfort
- Dominant hand fingers are typically slightly larger than your non-dominant hand
- Knuckle size matters - if your knuckles are significantly larger than the base of your finger, consider a sizing bead or adjustable ring