Info

Ring size comparison

Ring size
Circumference
Inside diam
Japan
(JCS)
Europe
(JIS)
USA
8
48
4.5
48.2mm
15.4mm
9
49
5
49.2mm
15.7mm
10
50
5.5
50.3mm
16.0mm
11
51
6
51.3mm
16.4mm
12
52
6.5
52.4mm
16.7mm
13
53
7
53.4mm
17.0mm
14
54
7.5
54.4mm
17.4mm
15
55
8
55.5mm
17.7mm
16
56
8.5
56.5mm
18.0mm