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 |