Ring Size Guide
TWO WAYS TO MEASURE
Do this in the evening, at room temperature. Fingers are smallest in the morning and in the cold, so an evening reading gives the size that fits all day.
➊ From a ring that already fits
- Choose a ring worn on the intended finger, ideally one that sits snugly without catching the knuckle.
- Lay it flat and measure the inside diameter in millimetres, edge to edge through the centre.
- Match that figure to the diameter column in the chart below.
➋ String or paper strip
- Wrap a strip of paper (or non-stretch thread) snugly around the base of the finger, over the knuckle.
- Mark where it overlaps, then lay it flat and measure to that mark in millimetres.
- That figure is the circumference — match it to the circumference column.
* For wide bands (6mm or more): go up one full UK size from the chart result. A wide band grips more of the finger's taper, so it wears tighter than a narrow one at the same measurement.
* Measure the dominant hand separately — it typically runs half a size larger.
UK SIZE CHART
Full and half sizes, A to Z, with the nearest US and EU equivalents. EU sizing is simplest to cross-check by hand: the EU number is the circumference in mm, rounded.
| UK | Diameter (mm) | Circumference (mm) | US approx. | EU approx. |
|---|---|---|---|---|
| A | 12.04 | 37.80 | — | 38 |
| A½ | 12.24 | 38.50 | — | — |
| B | 12.45 | 39.10 | — | 39 |
| B½ | 12.65 | 39.70 | — | — |
| C | 12.85 | 40.40 | 1 | 40 |
| C½ | 13.06 | 41.00 | — | — |
| D | 13.26 | 41.70 | 2 | 42 |
| D½ | 13.46 | 42.30 | — | — |
| E | 13.67 | 42.90 | 2.5 | 43 |
| E½ | 13.87 | 43.60 | — | — |
| F | 14.07 | 44.20 | 3 | 44 |
| F½ | 14.27 | 44.80 | — | — |
| G | 14.48 | 45.50 | 3.5 | 45 |
| G½ | 14.68 | 46.10 | — | — |
| H | 14.88 | 46.80 | 4 | 47 |
| H½ | 15.09 | 47.40 | — | — |
| I | 15.29 | 48.00 | 4.25 | 47 |
| J | 15.49 | 48.70 | 4.625 | 49 |
| J½ | 15.70 | 49.30 | — | — |
| K | 15.90 | 50.00 | 5.125 | 50 |
| K½ | 16.10 | 50.60 | — | — |
| L | 16.31 | 51.20 | 5.5 | 51 |
| L½ | 16.51 | 51.90 | — | — |
| M | 16.71 | 52.50 | 6 | 53 |
| M½ | 16.92 | 53.10 | — | — |
| N | 17.12 | 53.80 | 6.5 | 54 |
| N½ | 17.32 | 54.40 | — | — |
| O | 17.53 | 55.10 | 7 | 55 |
| O½ | 17.73 | 55.70 | — | — |
| P | 17.93 | 56.30 | 7.5 | 56 |
| P½ | 18.14 | 57.00 | — | — |
| Q | 18.34 | 57.60 | 8 | 58 |
| Q½ | 18.54 | 58.30 | — | — |
| R | 18.75 | 58.90 | 8.625 | 59 |
| R½ | 18.95 | 59.50 | — | — |
| S | 19.15 | 60.20 | 9.125 | 60 |
| S½ | 19.35 | 60.80 | — | — |
| T | 19.56 | 61.40 | 9.625 | 61 |
| T½ | 19.76 | 62.10 | — | — |
| U | 19.96 | 62.70 | 10.25 | 63 |
| U½ | 20.17 | 63.40 | — | — |
| V | 20.37 | 64.00 | 10.625 | 64 |
| V½ | 20.57 | 64.60 | — | — |
| W | 20.78 | 65.30 | 11.125 | 65 |
| W½ | 20.98 | 65.90 | — | — |
| X | 21.18 | 66.60 | 11.625 | 66 |
| X½ | 21.39 | 67.20 | — | — |
| Y | 21.59 | 67.80 | 12 | 68 |
| Z | 21.79 | 68.50 | 12 | 69 |
US and EU columns are close approximations for reference only — always order and refund against the UK letter and mm reading, not the converted figure. Sizes beyond Z (Z+1 to Z+6) are made to order; get in touch with an exact mm measurement for these.