Ring Size Guide

UK	EU	US	Diameter	Circumference
J	49	4.75	15.72	49.39
J 1/2	49.6	5	15.92	50.01
K	50.2	5.2	16.12	50.63
K 1/2	50.8	5.5	16.31	51.25
L	51.5	5.7	16.51	51.87
L 1/2	52.1	6	16.71	52.50
M	52.7	6.2	16.91	53.12
M 1/2	53.3	6.4	17.11	53.74
N	53.9	6.7	17.30	54.36
N 1/2	54.5	6.9	17.50	54.99
O	55.2	7.2	17.70	55.61
O 1/2	55.8	7.4	17.90	56.23
P	56.4	7.6	18.10	56.85
P 1/2	57	7.9	18.29	57.47
Q	57.6	8.1	18.49	58.10
Q 1/2	58.2	8.4	18.69	58.72
R	58.8	8.6	18.89	59.34
R 1/2	59.5	8.8	19.09	59.96
S	60.1	9.1	19.28	60.59
S 1/2	60.7	9.3	19.48	61.21
T	61.3	9.6	19.68	61.83
T 1/2	61.9	9.8	19.88	62.45
U	62.5	10	20.08	63.07
U 1/2	63.1	10.3	20.28	63.70
V	63.8	10.5	20.47	64.32
V 1/2	64.4	10.8	20.67	64.94
W	65	11	20.87	65.56

 

The diameter and circumference are measured in millimeters.