Ring Size Calculator
Select A Country and Size
Result
US
British
French
German
Japanese
Swiss
0
.25
.5
.75
1
1.25
1.5
1.75
2
2.25
2.5
2.75
3
3.25
3.5
3.75
4
4.25
4.5
4.75
5
5.25
5.5
5.75
6
6.25
6.5
6.75
7
7.25
7.5
7.75
8
8.25
8.5
8.75
9
9.25
9.5
9.75
10
10.25
10.5
10.75
11
11.25
11.5
11.75
12
12.25
12.5
12.75
13
13.25
13.5
13.75
14
14.25
14.5
14.75
15
15.25
15.5
--
--
A
A 1/2
B
B 1/2
C
C 1/2
D
D 1/2
E
E 1/2
F
F 1/2
G
G 1/2
H
H 1/2
I
J
J 1/2
K
K 1/2
L
L 1/2
M
M 1/2
N
N 1/2
O
O 1/2
P
P 1/2
Q
Q 1/2
R
R 1/2
S
S 1/2
T
T 1/2
U
U 1/2
V
V 1/2
W
W 1/2
X
X 1/2
Y
Z
Z 1/2
--
Z1
--
Z2
Z3
--
Z4
--
--
--
--
36.5
37.2
37.8
38.5
39.1
39.7
40.4
41
41.7
42.3
42.9
43.6
44.2
44.8
45.5
46.1
46.8
47.4
48
48.7
49.3
50
50.6
51.2
51.9
52.5
53.1
53.8
54.4
55.1
55.7
56.3
57
57.6
58.3
58.9
59.5
60.2
60.8
61.4
62.1
62.7
63.4
64
64.6
65.3
65.9
66.6
67.2
67.8
68.5
69.1
69.7
70.4
71
71.7
72.3
72.9
73.6
74.2
74.8
75.5
76.1
11.63
11.84
12.04
12.24
12.45
12.65
12.85
13.06
13.26
13.46
13.67
13.87
14.07
14.27
14.48
14.68
14.88
15.09
15.29
15.49
15.7
15.9
16.1
16.31
16.51
16.71
16.92
17.12
17.32
17.53
17.73
17.93
18.14
18.34
18.54
18.75
18.95
19.15
19.35
19.56
19.76
19.96
20.17
20.37
20.57
20.78
20.98
21.18
21.39
21.59
21.79
22
22.2
22.4
22.61
22.81
23.01
23.22
23.42
23.62
23.83
24.03
24.23
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1
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2
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3
--
4
5
--
6
7
--
8
--
9
--
10
--
11
12
13
--
14
--
15
--
16
--
17
--
18
--
19
--
20
21
22
--
23
--
24
--
25
--
26
--
27
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0.5
1
1.75
2.25
3
3.5
4.25
4.75
5.5
6
6.75
7.5
8
8.75
9.25
10
10.5
11.25
11.75
12.5
13.25
13.75
14.5
15
15.75
16.25
17
17.5
18.25
19
19.5
20.25
20.75
21.5
22
22.75
23.25
24
24.75
25.25
26
26.5
27.25
27.75
28.5
29
29.75
30.5
31
31.75
32.25
33
33.5
34.25
34.75
35.5
36.25
US
British
French
German
Japanese
Swiss
Inner Circumference
1.44
1.46
1.49
1.51
1.54
1.56
1.59
1.61
1.64
1.67
1.69
1.72
1.74
1.77
1.79
1.82
1.84
1.87
1.89
1.92
1.94
1.97
1.99
2.02
2.04
2.07
2.09
2.12
2.14
2.17
2.19
2.22
2.24
2.27
2.29
2.32
2.34
2.37
2.39
2.42
2.44
2.47
2.49
2.52
2.54
2.57
2.59
2.62
2.65
2.67
2.7
2.72
2.75
2.77
2.8
2.82
2.85
2.87
2.9
2.92
2.95
2.97
3
in
36.5
37.2
37.8
38.5
39.1
39.7
40.4
41
41.7
42.3
42.9
43.6
44.2
44.8
45.5
46.1
46.8
47.4
48
48.7
49.3
50
50.6
51.2
51.9
52.5
53.1
53.8
54.4
55.1
55.7
56.3
57
57.6
58.3
58.9
59.5
60.2
60.8
61.4
62.1
62.7
63.4
64
64.6
65.3
65.9
66.6
67.2
67.8
68.5
69.1
69.7
70.4
71
71.7
72.3
72.9
73.6
74.2
74.8
75.5
76.1
mm
Diameter
0.458
0.466
0.474
0.482
0.49
0.498
0.506
0.514
0.522
0.53
0.538
0.546
0.554
0.562
0.57
0.578
0.586
0.594
0.602
0.61
0.618
0.626
0.634
0.642
0.65
0.658
0.666
0.674
0.682
0.69
0.698
0.706
0.714
0.722
0.73
0.738
0.746
0.754
0.762
0.77
0.778
0.786
0.794
0.802
0.81
0.818
0.826
0.834
0.842
0.85
0.858
0.866
0.874
0.8825
0.89
0.898
0.906
0.914
0.922
0.93
0.938
0.946
0.954
in
11.63
11.84
12.04
12.24
12.45
12.65
12.85
13.06
13.26
13.46
13.67
13.87
14.07
14.27
14.48
14.68
14.88
15.09
15.29
15.49
15.7
15.9
16.1
16.31
16.51
16.71
16.92
17.12
17.32
17.53
17.73
17.93
18.14
18.34
18.54
18.75
18.95
19.15
19.35
19.56
19.76
19.96
20.17
20.37
20.57
20.78
20.98
21.18
21.39
21.59
21.79
22
22.2
22.4
22.61
22.81
23.01
23.22
23.42
23.62
23.83
24.03
24.23
mm