Home >> Site Support >> International Ring Sizes >> Go Back
International Ring Sizes:
At
Opal-Trader.com we measure the size of all our rings with an industry
standard jeweler's mandrel. The charts below convert the actual ring size
(Size mm) into some of the popular internationally recognized sizes. If
you cannot find a size in the charts that you are familiar with, please
contact us.
Size (inches) |
Size (mm) |
Diameter (mm) |
U.S.A. size |
Japanese size |
British size |
German size |
Swiss size |
1 14/16 |
48 |
15.27 |
4 1/2 |
8 |
I - 1/2 |
15 1/4 |
-- |
| 1 15/16 |
49 |
15.70 |
5 |
9 |
J 1/2 |
15 3/4 |
-- |
2 |
51 |
16.10 |
5 1/2 |
11 |
L |
16 |
11 3/4 |
| 2 1/16 |
52 |
16.51 |
6 |
12 |
M |
16 1/2 |
12 3/4 |
2 2/16 |
53 |
16.92 |
6 1/2 |
13 |
N |
17 |
14 |
| 2 3/16 |
55 |
17.35 |
7 |
14 |
O |
17 1/4 |
15 1/4 |
2 4/16 |
56 |
17.75 |
7 1/2 |
15 |
P |
17 3/4 |
16 1/2 |
| 2 5/16 |
57 |
18.19 |
8 |
16 |
Q |
18 |
17 3/4 |
2 6/16 |
58 |
18.53 |
8 1/2 |
17 |
Q 1/2 |
18 1/2 |
-- |
| 2 7/16 |
59 |
18.89 |
9 |
18 |
R 1/2 |
19 |
-- |
2 8/16 |
61 |
19.41 |
9 1/2 |
19 |
S 1/2 |
19 1/2 |
-- |
| 2 9/16 |
62 |
19.84 |
10 |
20 |
T 1/2 |
20 |
-- |
2 10/16 |
63 |
20.20 |
10 1/2 |
22 |
U 1/2 |
20 1/4 |
-- |
| 2 11/16 |
65 |
20.68 |
11 |
23 |
V 1/2 |
20 3/4 |
-- |
2 12/16 |
66 |
21.08 |
11 1/2 |
24 |
W 1/2 |
21 |
-- |
| 2 13/16 |
68 |
21.49 |
12 |
25 |
Y |
21 1/4 |
27 1/2 |
2 14/16 |
69 |
21.89 |
12 1/2 |
26 |
Z |
21 3/4 |
28 3/4 |
| 2 15/16 |
70 |
22.33 |
13 |
27 |
-- |
22 |
-- |
Size (inches) |
Size (mm) |
Diameter (mm) |
U.S.A. size |
Australian size |
Italian size |
French size |
|
1 14/16 |
48 |
15.27 |
4 1/2 |
I 1/2 |
8 |
-- |
|
| 1 15/16 |
49 |
15.70 |
5 |
J 1/2 |
9.5 |
-- |
|
2 |
51 |
16.10 |
5 1/2 |
L |
10.5 |
51 3/4 |
|
| 2 1/16 |
52 |
16.51 |
6 |
M |
11.5 |
52 3/4 |
|
2 2/16 |
53 |
16.92 |
6 1/2 |
N |
13 |
54 |
|
| 2 3/16 |
55 |
17.35 |
7 |
O |
14.5 |
55 1/4 |
|
2 4/16 |
56 |
17.75 |
7 1/2 |
P |
16 |
56 1/2 |
|
| 2 5/16 |
57 |
18.19 |
8 |
Q |
17 |
57 3/4 |
|
2 6/16 |
58 |
18.53 |
8 1/2 |
Q 1/2 |
18.5 |
58 |
|
| 2 7/16 |
59 |
18.89 |
9 |
R 1/2 |
19.5 |
59 1/4 |
|
2 8/16 |
61 |
19.41 |
9 1/2 |
S 1/2 |
21 |
60 1/2 |
|
| 2 9/16 |
62 |
19.84 |
10 |
T 1/2 |
22 |
61 3/4 |
|
2 10/16 |
63 |
20.20 |
10 1/2 |
U 1/2 |
23.5 |
62 3/4 |
|
| 2 11/16 |
65 |
20.68 |
11 |
V 1/2 |
25 |
64 1/4 |
|
2 12/16 |
66 |
21.08 |
11 1/2 |
W 1/2 |
26.5 |
66 |
|
| 2 13/16 |
68 |
21.49 |
12 |
Y |
27.5 |
67 1/2 |
|
2 14/16 |
69 |
21.89 |
12 1/2 |
Z |
28.5 |
68 3/4 |
|
| 2 15/16 |
70 |
22.33 |
13 |
-- |
30 |
-- |
|
The formulae commonly used for calculating ring sizes are included below. Although all reasonable care is taken by Opal-Trader.com to present true and accurate ring size conversions, some countries and regions have different interpretations of ring sizing. It always pays to check your true ring size at your local jewelry store before ordering rings to allow for these demographic variations in size interpretation.
Ring size calculator
Diameter = (British Size x 0.4) + 11.50 .... where A=1,
B=2, C=3, D=4..... Z=26.... etc
Diameter = (U.S.A. Size x 0.83) + 11.50
Diameter = (Japanese Size / 3) + 12.67
Some European Sizes = Circumference minus 40
The diameter is expressed in millimeters in all instances above.
View the entire range of Opal Jewelry at Opal-Trader.com