Discover your ring size.

Inter-diameter (mm)	Hong Kong Size	US Size	UK Size
14.9	9	4	H
15.3	10	4.5	I
15.7	11	5	J 1/2
16.1	12	5.5	K 1/2
16.5	13	6	L 1/2
16.7	14	6.25	M
17.1	15	6.75	N
17.3	16	7	N 1/2
17.7	17	7.5	O 1/2
18.2	18	8	P 1/2
18.5	19	8.5	Q 1/2