| UK/AU Size |
US/Canada Size |
Inner Circumference (mm) |
Inner Diameter (mm) |
| J ½ |
5 |
49.0 |
15.7 |
| K |
5.5 |
50.6 |
16.1 |
| L ½ |
6 |
51.9 |
16.9 |
| M ½ |
6.5 |
53.1 |
17.0 |
| N |
7 |
54.4 |
17.3 |
| O ½ |
7.5 |
55.7 |
17.7 |
| P |
8 |
57.0 |
18.05 |
| Q ½ |
8.5 |
58.3 |
18.54 |
| R |
9 |
59.5 |
19.0 |
| S ½ |
9.5 |
60.8 |
19.4 |
| T |
10 |
62.1 |
19.8 |
| U ½ |
10.5 |
63.4 |
20.2 |
| V |
11 |
64.6 |
20.6 |
| W ½ |
11.5 |
65.9 |
21.0 |
🪄 How to Measure Your Ring Size at Home (Australia-friendly Tips)
Wrap a piece of string or dental floss around the base of your finger.
Mark the point where it overlaps and measure its length in millimetres.
Match that measurement to the circumference column above or use the diameter grid above.
If your finger falls between sizes, choose the larger size—it’s more comfortable, especially for wider bands.
Fingers can swell throughout the day, so measure mid-afternoon at room temperature.For a special ring (like engagement or wide band), consider visiting a local jeweller for a pro fitting. 📏
✅ Most Australian jewellers use UK lettering, so it’s super easy to match!
