While it is best to have your ring size determined by a professional
jeweler, the following information can be a helpful guide.
The diameter of an exisitng ring can be measured or the circumference can
be obtained by wrapping the finger with a strip of paper or string and
carefully measuring that length.
Conversion chart for ring sizes
| US & Canada
Ring Sizing |
International
Ring Sizing |
Inside diameter (inches)
|
Inside circumference (inches) |
US & Canada
Ring Sizes
|
Inside diameter (mm) |
Inside circumference (mm) |
UK, Ireland & Australia |
Japan |
Switzerland |
| 0.49 |
1.54 |
1 |
12.45 |
39.1 |
B |
1 |
|
| 0.522 |
1.64 |
2 |
13.26 |
41.7 |
D |
2 |
1.5 |
| 0.554 |
1.74 |
3 |
14.07 |
44.2 |
F |
4 |
4 |
| 0.586 |
1.84 |
4 |
14.88 |
46.8 |
H |
7 |
|
| 0.618 |
1.94 |
5 |
15.70 |
49.3 |
J 1/2 |
9 |
|
| 0.65 |
2.04 |
6 |
16.51 |
51.9 |
L 1/2 |
11 |
12.75 |
| 0.682 |
2.14 |
7 |
17.32 |
54.4 |
N 1/2 |
14 |
15.25 |
| 0.714 |
2.24 |
8 |
18.14 |
57.0 |
P 1/2 |
16 |
17.75 |
| 0.746 |
2.34 |
9 |
18.95 |
59.5 |
R 1/2 |
18 |
|
| 0.778 |
2.44 |
10 |
19.76 |
62.1 |
T 1/2 |
20 |
|
| 0.81 |
2.54 |
11 |
20.57 |
64.6 |
V 1/2 |
23 |
|
| 0.842 |
2.65 |
12 |
21.39 |
67.2 |
X 1/2 |
25 |
27.5 |
| 0.874 |
2.75 |
13 |
22.20 |
69.7 |
|
27 |
|
| 0.906 |
2.85 |
14 |
23.01 |
72.3 |
Z3 |
|
|
| 0.938 |
2.95 |
15 |
23.83 |
74.8 |
|
|
|
| 0.97 |
3.05 |
16 |
24.64 |
77.4 |
|
|
|
|
