International Ring Size Chart
Japan
Size
(Inches)
Diameter
(Inches)
Size
(mm)
Diameter
(mm)
USA and
CA
Great
Britain
Germany
Switzerland
France
8
1.88
0.60
47.63
15.27
4 1/2
I-½
15 1/2
7 3/4
47 3/4
9
1.94
0.61
49.21
15.70
5
J-½
15 3/4
9
49
11
2.00
0.63
50.80
16.10
5 3/4
L
---
10 7/8
50 7/8
12
2.06
0.64
52.39
16.51
6
L-½
16 1/2
11 1/2
51 1/2
13
2.13
0.66
53.98
16.92
6 1/2
M-½
17
12 3/4
52 3/4
14
2.19
0.68
55.56
17.35
7
O
17 1/4
14
54
15
2.25
0.69
57.15
17.75
7 1/2
P
17 3/4
15 1/4
55 1/4
16
2.31
0.71
58.74
18.19
8
Q
18
16 1/2
56 1/2
17
2.38
0.72
60.33
18.53
8 1/2
R
18 1/2
17 3/4
57 3/4
18
2.44
0.74
61.91
18.89
9
S
19
19
59
19
2.50
0.76
63.50
19.41
9 1/2
---
19 1/2
20 1/4
60 1/4
20
2.56
0.77
65.09
19.84
10
T-½
20
21 1/2
61 1/2
22
2.63
0.79
66.68
20.20
10 1/2
U-½
20 1/2
22 3/4
62 3/4
23
2.69
0.81
68.26
20.68
11
V-½
20 3/4
24
64
24
2.75
0.82
69.85
21.08
11 1/2
W-½
21
25 1/4
65 1/4
25
2.81
0.84
71.44
21.49
12
Y
21 1/4
26 1/2
66 1/2
26
2.88
0.85
73.03
21.89
12 1/2
Z
21 3/4
27 3/4
67 3/4
27
2.94
0.87
74.61
22.33
13
---
22
29
69


* Rings' Sizes differ in various parts of the world.
We use the USA and CA size list on this website..


* All rings' sizes are approximate. Actual sizes may slightly vary.