How do I find my ring size?

Women's Size Guide

UK	US	EU	Inside Diameter (MM)	Inside Circumference (MM)
I	4	47	15.29	48
J	4 3/4	48	15.49	48.7
J 1/2	5	49	15.7	49.3
K	5 3/8	50	16	50.3
L	5 3/4	51	16.31	51.2
M	6	52	16.71	52.5
N	6 3/4	53	17.12	53.8
N 1/2	7	54	17.32	54.4
O	7 1/4	55	17.53	55.1
P	7 3/4	56	17.93	56.3
Q	8	57	18.34	57.6
Q 1/2	8 1/2	58	18.54	58.2
R	9	59	18.95	59.5
S	9 3/8	60	19.25	60.5