Ring Size Conversion Guide
Not sure what size to order? Use this chart to convert ring sizes across the UK, US/Canada, EU, and Switzerland. Our store uses UK ring sizes by default. If you know your size in another system, simply use this table to find the UK equivalent. All measurements are approximate — we recommend measuring a few times to ensure the best fit!
| UK Size | US/Canada | EU Size (mm) | Switzerland (mm) | Inside Diameter (mm) |
|---|---|---|---|---|
| D | 2.25 | 41.5 | 41.5 | 13.2 |
| E | 2.75 | 42.7 | 42.7 | 13.6 |
| F | 3.25 | 44.0 | 44.0 | 14.0 |
| G | 3.75 | 45.2 | 45.2 | 14.4 |
| H | 4.25 | 46.5 | 46.5 | 14.8 |
| I | 4.5 | 47.8 | 47.8 | 15.2 |
| J | 5 | 49.0 | 49.0 | 15.6 |
| K | 5.5 | 50.3 | 50.3 | 16.0 |
| L | 5.75 | 51.5 | 51.5 | 16.4 |
| M | 6.25 | 52.8 | 52.8 | 16.8 |
| N | 6.75 | 54.0 | 54.0 | 17.2 |
| O | 7 | 55.3 | 55.3 | 17.6 |
| P | 7.5 | 56.6 | 56.6 | 18.0 |
| Q | 8 | 57.8 | 57.8 | 18.4 |
| R | 8.5 | 59.1 | 59.1 | 18.8 |
| S | 9 | 60.3 | 60.3 | 19.2 |
| T | 9.75 | 61.6 | 61.6 | 19.6 |
| U | 10.25 | 62.8 | 62.8 | 20.0 |
| V | 10.75 | 64.1 | 64.1 | 20.4 |
| W | 11 | 65.3 | 65.3 | 20.8 |
| X | 11.5 | 66.6 | 66.6 | 21.2 |
| Y | 12 | 67.8 | 67.8 | 21.6 |
| Z | 12.5 | 69.1 | 69.1 | 22.0 |
How to Measure Your Ring Size at Home (UK Sizing)
- Cut a thin strip of paper or string, about 2mm wide and at least 100mm long.
- Wrap it around the base of your finger where you’d normally wear your ring.
- Make sure the fit is snug, but not too tight — the ring should slide over your knuckle comfortably.
- Mark the spot where the paper or string overlaps to form a circle.
- Lay the strip flat and measure it in **millimetres** – this is your finger’s circumference.
- Use the conversion chart above to find the **corresponding UK size**.
Top Tips for Accurate Sizing
- Measure your finger at the **end of the day** when it’s slightly larger.
- Avoid measuring when your hands are cold – they shrink slightly!
- If you're between sizes, always choose the **larger** one for comfort.
- Wide rings feel tighter – you might need to go up half a size for wide bands.
- Buying for someone else? Borrow a ring they wear on that finger and measure it instead.