How to determine your ring size
If you plan to buy a ring for yourself or someone else, knowing the right size is essential. You can calculate the circumference of your finger yourself by wrapping a rope around your finger and measure the number of millimetres with a measuring tape. The length of the ribbon is the circumference of your finger. Check the table to see which ring size best fits your circumference.
International ring size table
US ring size | 5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 12 |
|---|---|---|---|---|---|---|---|---|---|
Circumference mm | 49 |
52 |
53 |
54 |
55 |
56 |
58 |
59 |
67.5 |
Diameter mm | 15.6 | 16 | 17 |
17.3 | 17.5 | 18 | 18.5 |
19 |
21.5 |
Size UK / AU | J 1/2 | M | N | O | P |
Q
| R
| S | Y |








