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Ring Size Chart

Inside diameter
Inside circumference
Sizes
(inches)
(millimetres)
(inches)
(millimetres)
United States
and Canada
United Kingdom,
Ireland,
and Australia
Japan
Switzerland
0.46
11.63
1.44
36.53
0


 
0.47
11.84
1.46
37.17
1/4


 
0.47
12.04
1.49
37.80
1/2
A

 
0.48
12.24
1.51
38.44
3/4
A 1/2

 
0.49
12.45
1.54
39.08
1
B
1
 
0.50
12.65
1.56
39.72
1 1/4
B 1/2

 
0.51
12.85
1.59
40.36
1 1/2
C

 
0.51
13.06
1.61
40.99
1 3/4
C 1/2

 
0.52
13.26
1.64
41.63
2
D
2
1.5
0.53
13.46
1.66
42.27
2 1/4
D 1/2

 
0.54
13.67
1.69
42.91
2 1/2
E
3
2.75
0.55
13.87
1.71
43.55
2 3/4
E 1/2

 
0.55
14.07
1.74
44.18
3
F
4
4
0.56
14.27
1.76
44.82
3 1/4
F 1/2
5
5.25
0.57
14.48
1.79
45.46
3 1/2
G

 
0.58
14.68
1.81
46.10
3 3/4
G 1/2
6
6.5
0.59
14.88
1.84
46.74
4
H
7
 
0.59
15.09
1.87
47.38
4 1/4
H 1/2

7.75
0.60
15.29
1.89
48.01
4 1/2
I
8
 
0.61
15.49
1.92
48.65
4 3/4
J

9
0.62
15.70
1.94
49.29
5
J 1/2
9
 
0.63
15.90
1.97
49.93
5 1/4
K

10
0.63
16.10
1.99
50.57
5 1/2
K 1/2
10
 
0.64
16.31
2.02
51.20
5 3/4
L

11.75
0.65
16.51
2.04
51.84
6
L 1/2
11
12.75
0.66
16.71
2.07
52.48
6 1/4
M
12
 
0.67
16.92
2.09
53.12
6 1/2
M 1/2
13
14
0.67
17.12
2.12
53.76
6 3/4
N

 
0.68
17.32
2.14
54.39
7
N 1/2
14
15.25
0.69
17.53
2.17
55.03
7 1/4
O

 
0.70
17.73
2.19
55.67
7 1/2
O 1/2
15
16.5
0.71
17.93
2.22
56.31
7 3/4
P

 
0.71
18.14
2.24
56.95
8
P 1/2
16
17.75
0.72
18.34
2.27
57.58
8 1/4
Q

 
0.73
18.54
2.29
58.22
8 1/2
Q 1/2
17
 
0.74
18.75
2.32
58.86
8 3/4
R

19
0.75
18.95
2.34
59.50
9
R 1/2
18
 
0.75
19.15
2.37
60.14
9 1/4
S

20.25
0.76
19.35
2.39
60.77
9 1/2
S 1/2
19
 
0.77
19.56
2.42
61.41
9 3/4
T

21.5
0.78
19.76
2.44
62.05
10
T 1/2
20
 
0.79
19.96
2.47
62.69
10 1/4
U
21
 
0.79
20.17
2.49
63.33
10 1/2
U 1/2
22
22.75
0.80
20.37
2.52
63.96
10 3/4
V

 
0.81
20.57
2.54
64.60
11
V 1/2
23
 
0.82
20.78
2.57
65.24
11 1/4
W

25
0.83
20.98
2.59
65.88
11 1/2
W 1/2
24
 
0.83
21.18
2.62
66.52
11 3/4
X

 
0.84
21.39
2.64
67.15
12
X 1/2
25
27.5
0.85
21.59
2.67
67.79
12 1/4
Y

 
0.86
21.79
2.69
68.43
12 1/2
Z
26
28.75
0.87
22.00
2.72
69.07
12 3/4
Z 1/2

 
0.87
22.20
2.74
69.71
13

27
 
0.88
22.40
2.77
70.34
13 1/4
Z1

 
0.89
22.61
2.79
70.98
13 1/2


 
0.90
22.81
2.82
71.62
13 3/4
Z2

 
0.91
23.01
2.84
72.26
14
Z3

 
0.91
23.22
2.87
72.90
14 1/4


 
0.92
23.42
2.90
73.54
14 1/2
Z4

 
0.93
23.62
2.92
74.17
14 3/4


 
0.94
23.83
2.95
74.81
15


 
0.95
24.03
2.97
75.45
15 1/4


 
0.95
24.23
3.00
76.09
15 1/2


 
0.96
24.43
3.02
76.73
15 3/4


 
0.97
24.64
3.05
77.36
16


 


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