UK to US Ring Size Conversion Chart
Easily convert UK ring sizes (A–Z) to US, EU, and circumference measurements to find your perfect fit.
How to Measure Your Ring Size
- Measure your finger at the end of the day, when it's at its largest.
- Wrap a strip of paper or string around the base of your finger, mark where it overlaps, and measure in mm.
- Use the circumference to find your corresponding UK or US ring size.
- When between sizes, we recommend choosing the larger size—especially for wide bands.
Ring Size Conversion Table
| UK Size | US Size | EU Size | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|
| C | 1¾ | 40½ | 12.5 | 39.1 |
| D | 2¼ | 41½ | 13.0 | 40.8 |
| E | 2¾ | 42¾ | 13.3 | 41.9 |
| F | 3¼ | 44 | 13.7 | 43.1 |
| G | 3¾ | 45¼ | 14.1 | 44.3 |
| H | 4¼ | 46½ | 14.5 | 45.5 |
| I | 4½ | 47¾ | 14.9 | 46.8 |
| J | 5 | 49 | 15.3 | 48.0 |
| K | 5½ | 50¼ | 15.7 | 49.3 |
| L | 6 | 51½ | 16.1 | 50.6 |
| M | 6½ | 52¾ | 16.5 | 51.8 |
| N | 7 | 54 | 16.9 | 53.1 |
| O | 7½ | 55¼ | 17.3 | 54.4 |
| P | 8 | 56½ | 17.7 | 55.7 |
| Q | 8½ | 57¾ | 18.1 | 57.0 |
| R | 9 | 59 | 18.5 | 58.3 |
| S | 9½ | 60¼ | 19.0 | 59.5 |
| T | 10 | 61½ | 19.4 | 60.8 |
| U | 10½ | 62¾ | 19.8 | 62.1 |
| V | 11 | 64 | 20.2 | 63.4 |
| W | 11½ | 65¼ | 20.6 | 64.6 |
| X | 12 | 66½ | 21.0 | 65.9 |
| Y | 12½ | 67¾ | 21.4 | 67.2 |
| Z | 13 | 68¾ | 21.8 | 68.5 |
Frequently Asked Questions
Why does ring width matter?
Wider bands fit more snugly — we recommend sizing up slightly for wider rings.
Do you offer bespoke sizing help?
Yes — if you're in the UK, simply order our "Send Me a Ring Sizer" option. We'll send you a ring sizer along with a helpful guide, then wait for your sizing instructions before we begin making your ring. If your size isn’t listed, or if you’d like guidance or to book an appointment at our Birmingham Jewellery Quarter workshop for a personal ring sizing consultation, please get in touch.