Ring Size Specification

United States & Canada	UK, Europe & Australia	CN/SG/JP	HK	Switzerland	Circumference(mm)
4	H	7	9		46.8
4.25	0.5H			7.75	47.4
4.5	I	8	10		48
4.75	J			9	48.7
5	0.5J	9	11		49.3
5.25	K			10	50
5.5	0.5K	10	12		50.6
5.75	L			11.75	51.2
6	0.5L	11	13	12.75	51.9
6.25	M	12			52.5
6.5	0.5M	13	14.5	14	53.1
6.75	N				53.8
7	0.5N	14	16	15.25	54.4
7.25	O				55.1
7.5	0.5O	15	17	16.5	55.7
7.75	P				56.3
8	0.5P	16		17.75	57
8.25			18		57.2
8.5	0.5Q	17	19		58.3
8.75	R			19	58.9
9	0.5R	18	20.5		59.5
9.25	S			20.25	60.2
9.5	0.5S	19	22		60.8
9.75	T			21.5	61.4
10	0.5T	20	23		62.1
10.25	U	21			62.7
10.5	0.5U	22	24	22.75	63.4
10.75	V				64
11	0.5V	23	25		64.6
11.25	W			25	65.3
11.5	0.5W	24	26		65.9
11.75	X				66.6
12	0.4X	25	27.75	27.5	67.2