- Choose a ring you already own that fits the correct finger.
- Use a ring sizer tool, or wrap a strip of paper/string around your finger base, mark where it overlaps.
- Measure the length (in millimetres) of the paper/string and compare with a size chart.
- When doing this, consider your knuckle size (if large, go a half size up so the ring passes over comfortably).
Tip: Measure your finger at room temperature (not too cold or hot), ideally at the end of the day when fingers are slightly larger.
* These values are approximate. Slight variations may occur between different designers.
| UK Size |
Inside Diameter (mm) |
Approx US Size |
Approx EU Circumference (mm) |
| F |
~14.1 |
3 |
44 |
| G |
~14.5 |
3½ |
45¼ |
| H |
~15.0 |
4 |
46½ |
| I |
~15.6 |
5 |
49 |
| J |
~16.1 |
5½ |
50½ |
| K |
~16.5 |
6 |
51½ |
| K ½ |
~16.8 |
6½ |
52¼ |
| L |
~17.2 |
7 |
54 |
| M |
~17.6 |
7½ |
55½ |
| N |
~18.0 |
8 |
56¼ |
| O |
~18.5 |
8½ |
57¾ |
| P |
~19.0 |
9 |
60 |
| Q |
~19.5 |
9½ |
61¼ |
| R |
~20.0 |
10 |
63 |
| S |
~20.4 |
10½ |
64½ |
