2mm
International Ring Size Conversion Chart
|
Inside |
Inside |
Inside |
Inside |
Number Sizes |
Wheat Sheaf |
|
|
|
Diameter |
Diameter |
Circumference |
Circumference |
US/Canada |
British |
Japanese |
Swiss |
|
(inches) |
(mm) |
(inches) |
(mm) |
Standard |
Irish |
Equivalent |
Equivalent |
|
|
|
|
|
|
Australian |
|
|
|
|
|
|
|
|
Equivalent |
|
|
|
0.458 |
11.6 |
1.438 |
36.5 |
0 |
|
|
|
|
0.466 |
11.8 |
1.463 |
37.2 |
1/4 |
|
|
|
|
0.474 |
12.0 |
1.488 |
37.8 |
1/2 |
A |
|
|
|
0.482 |
12.2 |
1.513 |
38.4 |
3/4 |
A 1/2 |
|
|
|
0.490 |
12.4 |
1.539 |
39.1 |
1 |
B |
1 |
|
|
0.498 |
12.6 |
1.564 |
39.7 |
1 1/4 |
B 1/2 |
|
|
|
0.506 |
12.9 |
1.589 |
40.4 |
1 1/2 |
C |
|
|
|
0.514 |
13.1 |
1.614 |
41.0 |
1 3/4 |
C 1/2 |
|
|
|
0.522 |
13.3 |
1.639 |
41.6 |
2 |
D |
2 |
1.50 |
|
0.530 |
13.5 |
1.664 |
42.3 |
2 1/4 |
D 1/2 |
|
|
|
0.538 |
13.7 |
1.689 |
42.9 |
2 1/2 |
E |
3 |
2.75 |
|
0.546 |
13.9 |
1.714 |
43.5 |
2 3/4 |
E 1/2 |
|
|
|
0.554 |
14.1 |
1.740 |
44.2 |
3 |
F |
4 |
4.00 |
|
0.562 |
14.3 |
1.765 |
44.8 |
3 1/4 |
F 1/2 |
5 |
5.25 |
|
0.570 |
14.5 |
1.790 |
45.5 |
3 1/2 |
G |
|
|
|
0.578 |
14.7 |
1.815 |
46.1 |
3 3/4 |
G 1/2 |
6 |
6.50 |
|
0.586 |
14.9 |
1.840 |
46.7 |
4 |
H |
7 |
|
|
0.594 |
15.1 |
1.865 |
47.4 |
4 1/4 |
H 1/2 |
|
7.75 |
|
0.602 |
15.3 |
1.890 |
48.0 |
4 1/2 |
I |
8 |
|
|
0.610 |
15.5 |
1.915 |
48.7 |
4 3/4 |
J |
|
9.00 |
|
0.618 |
15.7 |
1.941 |
49.3 |
5 |
J 1/2 |
9 |
|
|
0.626 |
15.9 |
1.966 |
49.9 |
5 1/4 |
K |
|
10.00 |
|
0.634 |
16.1 |
1.991 |
50.6 |
5 1/2 |
K 1/2 |
10 |
|
|
0.642 |
16.3 |
2.016 |
51.2 |
5 3/4 |
L |
|
11.75 |
|
0.650 |
16.5 |
2.041 |
51.8 |
6 |
L 1/2 |
11 |
12.75 |
|
0.658 |
16.7 |
2.066 |
52.5 |
6 1/4 |
M |
12 |
|
|
0.666 |
16.9 |
2.091 |
53.1 |
6 1/2 |
M 1/2 |
13 |
14.00 |
|
0.674 |
17.1 |
2.116 |
53.8 |
6 3/4 |
N |
|
|
|
0.682 |
17.3 |
2.141 |
54.4 |
7 |
N 1/2 |
14 |
15.25 |
|
0.690 |
17.5 |
2.167 |
55.0 |
7 1/4 |
O |
|
|
|
0.698 |
17.7 |
2.192 |
55.7 |
7 1/2 |
O 1/2 |
15 |
16.50 |
|
0.706 |
17.9 |
2.217 |
56.3 |
7 3/4 |
P |
|
|
|
0.714 |
18.1 |
2.242 |
56.9 |
8 |
P 1/2 |
16 |
17.75 |
|
0.722 |
18.3 |
2.267 |
57.6 |
8 1/4 |
Q |
|
|
|
0.730 |
18.5 |
2.292 |
58.2 |
8 1/2 |
Q 1/2 |
17 |
|
|
0.738 |
18.7 |
2.317 |
58.9 |
8 3/4 |
R |
|
19 |
|
0.746 |
18.9 |
2.342 |
59.5 |
9 |
R 1/2 |
18 |
|
|
0.754 |
19.2 |
2.368 |
60.1 |
9 1/4 |
S |
|
20.25 |
|
0.762 |
19.4 |
2.393 |
60.8 |
9 1/2 |
S 1/2 |
19 |
|
|
0.770 |
19.6 |
2.418 |
61.4 |
9 3/4 |
T |
|
21.5 |
|
0.778 |
19.8 |
2.443 |
62.1 |
10 |
T 1/2 |
20 |
|
|
0.786 |
20.0 |
2.468 |
62.7 |
10 1/4 |
U |
21 |
|
|
0.794 |
20.2 |
2.493 |
63.3 |
10 1/2 |
U 1/2 |
22 |
22.75 |
|
0.802 |
20.4 |
2.518 |
64.0 |
10 3/4 |
V |
|
|
|
0.810 |
20.6 |
2.543 |
64.6 |
11 |
V 1/2 |
23 |
|
|
0.818 |
20.8 |
2.569 |
65.2 |
11 1/4 |
W |
|
25 |
|
0.826 |
21.0 |
2.594 |
65.9 |
11 1/2 |
W 1/2 |
24 |
|
|
0.834 |
21.2 |
2.619 |
66.5 |
11 3/4 |
X |
|
|
|
0.842 |
21.4 |
2.644 |
67.2 |
12 |
X 1/2 |
25 |
27.50 |
|
0.850 |
21.6 |
2.669 |
67.8 |
12 1/4 |
Y |
|
|
|
0.858 |
21.8 |
2.694 |
68.4 |
12 1/2 |
Z |
26 |
28.75 |
|
0.866 |
22.0 |
2.719 |
69.1 |
12 3/4 |
Z 1/2 |
|
|
|
0.874 |
22.2 |
2.744 |
69.7 |
13 |
|
27 |
|
|
0.882 |
22.4 |
2.769 |
70.3 |
13 1/4 |
Z1 |
|
|
|
0.890 |
22.6 |
2.795 |
71.0 |
13 1/2 |
|
|
|
|
0.898 |
22.8 |
2.820 |
71.6 |
13 3/4 |
Z2 |
|
|
|
0.906 |
23.0 |
2.845 |
72.3 |
14 |
Z3 |
|
|
|
0.914 |
23.2 |
2.870 |
72.9 |
14 1/4 |
|
|
|
|
0.922 |
23.4 |
2.895 |
73.5 |
14 1/2 |
Z4 |
|
|
|
0.930 |
23.6 |
2.920 |
74.2 |
14 3/4 |
|
|
|
|
0.938 |
23.8 |
2.945 |
74.8 |
15 |
|
|
|
|
0.946 |
24.0 |
2.970 |
75.4 |
15 1/4 |
|
|
|
|
0.954 |
24.2 |
2.996 |
76.1 |
15 1/2 |
|
|
|
|
0.962 |
24.4 |
3.021 |
76.7 |
15 3/4 |
|
|
|
|
0.970 |
24.6 |
3.046 |
77.4 |
16 |
|
|
|
We provide this chart to help our international customers find their US
equivalent size. Although we know from experience the chart gives very accurate
conversion results, Artebarca has no responsibility for calculation errors. We
encourage our customers to visit a local jewelry store and also double-check the
conversions whit another conversion table available online. Thank you..
) 
