US to UK Ring Size Chart

US UK ISO
3 F 44
3.5 G 46
4 H 47
4.5 I 48
5 J 49
5.5 K 51
6 L 52
6.5 M 53
7 N 54
7.5 O 56
8 P 57
8.5 Q 58
9 R 60
9.5 S 61
10 T 62
10.5 U 63
11 V 65
11.5 W 66
12 X 67
12.5 Y 68
13 Z 70
13.5 Z1 71
14 Z2 72

Other Charts

US to UKUS to ISOUS to ISO

ISO sizes represent inner circumference in millimeters — the international standard for ring sizing.