 |
| International ring sizes converter |
|
|
|
US Size
|
Dia. -inch
|
Dia. in MM
|
Metric -MM
|
British
|
French
|
German
|
Japan
|
Swiss
|
|
0000
|
.390
|
9.91
|
|
-
|
|
|
|
|
|
00
|
.422
|
10.72
|
|
-
|
|
|
|
|
|
0
|
.454
|
11.53
|
|
-
|
|
|
|
|
|
1/2
|
.474
|
11.95
|
|
A
|
|
|
|
|
|
3/4
|
.482
|
12.18
|
|
A 1/2
|
|
|
|
|
|
1
|
.487
|
12.37
|
38.9
|
B
|
|
|
1
|
|
|
1 1/4
|
-
|
12.60
|
39.6
|
B 1/2
|
|
|
|
|
|
1 1/2
|
.503
|
12.78
|
40.2
|
C
|
|
|
|
|
|
1 3/4
|
-
|
13.00
|
40.8
|
C 1/2
|
|
|
|
|
|
2
|
.520
|
13.21
|
41.5
|
D
|
41 1/2
|
13 1/2
|
2
|
1 1/2
|
|
2 1/4
|
-
|
13.41
|
42.1
|
D 1/2
|
-
|
-
|
|
|
|
2 1/2
|
.536
|
13.61
|
42.7
|
E
|
42 3/4
|
13 3/4
|
3
|
2 3/4
|
|
2 3/4
|
-
|
13.83
|
43.4
|
E 1/2
|
-
|
-
|
|
|
|
3
|
.553
|
14.05
|
44.0
|
F
|
44
|
14
|
4
|
4
|
|
3 1/8
|
-
|
14.15
|
44.3
|
F 1/2
|
-
|
-
|
|
|
|
3 1/4
|
-
|
14.25
|
44.6
|
-
|
-
|
-
|
|
|
|
3 3/8
|
-
|
14.36
|
44.9
|
G
|
45 1/4
|
-
|
5
|
5 1/4
|
|
3 1/2
|
.569
|
14.45
|
45.2
|
-
|
-
|
14 1/2
|
|
|
|
3 5/8
|
-
|
14.56
|
45.6
|
G 1/2
|
-
|
|
6
|
|
|
3 3/4
|
-
|
14.65
|
45.9
|
H
|
46 1/2
|
|
|
6 1/2
|
|
4
|
.585
|
14.86
|
46.5
|
H 1/2
|
-
|
15
|
7
|
|
|
4 1/4
|
-
|
15.04
|
47.1
|
I
|
47 3/4
|
|
|
7 3/4
|
|
4 1/2
|
.601
|
15.27
|
47.8
|
I 1/2
|
-
|
15 1/4
|
8
|
|
|
4 5/8
|
-
|
15.40
|
48.1
|
J
|
49
|
15 1/2
|
|
9
|
|
4 3/4
|
-
|
15.53
|
48.4
|
-
|
-
|
|
|
|
|
5
|
.618
|
15.70
|
49.0
|
J 1/2
|
-
|
15 3/4
|
9
|
|
|
5 1/8
|
-
|
15.80
|
49.3
|
K
|
50
|
|
|
10
|
|
5 1/4
|
-
|
15.90
|
49.6
|
-
|
-
|
|
|
|
|
5 3/8
|
-
|
16.0
|
50.0
|
K 1/2
|
-
|
|
10
|
|
|
5 1/2
|
.634
|
16.10
|
50.3
|
L
|
51 3/4
|
16
|
|
11 3/4
|
|
5 3/4
|
-
|
16.30
|
50.9
|
-
|
-
|
|
|
|
|
5 7/8
|
-
|
16.41
|
51.3
|
L 1/2
|
-
|
|
|
|
|
6
|
.650
|
16.51
|
51.5
|
M
|
52 3/4
|
16 1/2
|
12
|
12 3/4
|
|
6 1/4
|
-
|
16.71
|
52.2
|
M 1/2
|
-
|
|
|
|
|
6 1/2
|
.666
|
16.92
|
52.8
|
N
|
54
|
17
|
13
|
14
|
|
6 3/4
|
-
|
17.13
|
53.4
|
N 1/2
|
-
|
|
|
|
|
7
|
.683
|
17.35
|
54.0
|
O
|
55 1/4
|
17 1/4
|
14
|
15 1/4
|
|
7 1/4
|
-
|
17.45
|
54.7
|
O 1/2
|
-
|
|
|
|
|
7 1/2
|
.699
|
17.75
|
55.3
|
P
|
56 1/2
|
17 3/4
|
15
|
16 1/2
|
|
7 3/4
|
-
|
17.97
|
55.9
|
P 1/2
|
-
|
|
|
|
|
8
|
.716
|
18.19
|
56.6
|
Q
|
57 3/4
|
18
|
16
|
17 3/4
|
|
8 1/4
|
-
|
18.35
|
57.2
|
Q 1/2
|
-
|
|
|
|
|
8 1/2
|
.732
|
18.53
|
57.8
|
-
|
-
|
18 1/2
|
17
|
|
|
8 5/8
|
-
|
18.61
|
58.4
|
R
|
59
|
|
|
19
|
|
8 3/4
|
-
|
18.69
|
58.4
|
-
|
-
|
|
|
|
|
8 7/8
|
-
|
18.80
|
59.0
|
R 1/2
|
-
|
|
|
|
|
9
|
.748
|
18.89
|
59.1
|
-
|
-
|
19
|
18
|
|
|
9 1/8
|
-
|
19.10
|
59.4
|
S
|
60 1/4
|
|
|
20 1/4
|
|
9 1/4
|
-
|
19.22
|
59.7
|
-
|
-
|
|
|
|
|
9 3/8
|
-
|
19.31
|
60.0
|
S 1/2
|
-
|
|
|
|
|
9 1/2
|
.764
|
19.41
|
60.3
|
-
|
-
|
19 1/2
|
19
|
|
|
9 5/8
|
-
|
19.51
|
60.6
|
T
|
61 1/2
|
|
|
21 1/2
|
|
9 3/4
|
-
|
19.62
|
60.9
|
-
|
-
|
|
|
|
|
10
|
.781
|
19.84
|
61.6
|
T 1/2
|
-
|
20
|
20
|
|
|
10 1/4
|
-
|
20.02
|
62.2
|
U
|
62 3/4
|
|
21
|
22 3/4
|
|
10 1/2
|
.797
|
20.20
|
62.8
|
U 1/2
|
-
|
20 1/4
|
22
|
|
|
10 5/8
|
-
|
20.32
|
63.1
|
V
|
63
|
|
|
23 3/4
|
|
10 3/4
|
-
|
20.44
|
63.5
|
-
|
-
|
|
|
|
|
11
|
.814
|
20.68
|
64.1
|
V 1/2
|
-
|
20 3/4
|
23
|
|
|
11 1/8
|
-
|
20.76
|
64.3
|
W
|
65
|
|
|
25
|
|
11 1/4
|
-
|
20.85
|
64.7
|
-
|
-
|
|
|
|
|
11 3/8
|
-
|
20.94
|
65.0
|
W 1/2
|
-
|
|
|
|
|
11 1/2
|
-
|
21.08
|
65.3
|
-
|
-
|
21
|
24
|
|
|
11 5/8
|
.830
|
21.18
|
65.7
|
X
|
66 1/4
|
|
|
26 1/4
|
|
11 3/4
|
-
|
21.24
|
66.0
|
-
|
-
|
|
|
|
|
11 7/8
|
-
|
21.30
|
66.3
|
X 1/2
|
-
|
|
|
|
|
12
|
.846
|
21.49
|
66.6
|
Y
|
67 1/2
|
21 1/4
|
25
|
27 1/2
|
|
12 1/4
|
-
|
21.69
|
67.2
|
Y 1/2
|
-
|
|
|
|
|
12 1/2
|
.862
|
21.89
|
67.9
|
Z
|
68 3/4
|
21 3/4
|
26
|
28 3/4
|
|
12 3/4
|
-
|
22.10
|
68.5
|
Z 1/2
|
-
|
|
|
|
|
13
|
.879
|
22.33
|
69.1
|
-
|
-
|
22
|
27
|
|
|
|
|
|
|
|
|
|
