| 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!
