Ring size chart

US	diameter (mm)	HK	diameter (mm)	JP	diameter (mm)	UK	diameter (mm)
3	14.1	6	14.1	4	14.0	F	14.1
3.25	14.3	6.5	14.2	5	14.3	G	14.5
3.5	14.5	7	14.3	6	14.7	H	14.9
3.75	14.7	7.5	14.5	7	15.0	I	15.3
4	14.9	8	14.7	8	15.3	J	15.5
4.25	15.1	8.5	14.8	9	15.7	K	15.9
4.5	15.3	9	14.9	10	16.0	L	16.3
4.75	15.5	9.5	15.1	11	16.3	M	16.7
5	15.7	10	15.3	12	16.7	N	17.1
5.25	15.9	10.5	15.5	13	17.0	O	17.5
5.5	16.2	11	15.7	14	17.3	P	17.9
5.75	16.4	11.5	15.9	15	17.7	Q	18.3
6	16.6	12	16.1	16	18.0	R	18.7
6.25	16.8	12.5	16.3	17	18.3	S	19.2
6.5	17.0	13	16.5	18	18.7	T	19.5
6.75	17.2	13.5	16.6	19	19.0	U	20.0
7	17.4	14	16.7	20	19.3	V	20.4
7.25	17.6	14.5	16.9	21	19.7	W	20.8
7.5	17.8	15	17.1	22	20.0	X	21.2
7.75	18.0	15.5	17.2	23	20.3	Y	21.6
8	18.2	16	17.3	24	20.7	Z	21.8
8.25	18.4	16.5	17.5	24.5	20.8
8.5	18.6	17	17.7	25	21.0
8.75	18.8	17.5	18.0	25.5	21.2
9	19.0	18	18.2	26	21.3
9.25	19.2	18.5	18.4	26.5	21.5
9.5	19.4	19	18.5	27	21.7
9.75	19.6	19.5	18.7	27.5	21.8
10	19.8	20	18.8	28	22.0
10.25	20.0	20.5	19.0	28.5	22.2
10.5	20.2	21	19.1	29	22.3
10.75	20.4	21.5	19.3	29.5	22.5
11	20.6	22	19.4
11.25	20.8	22.5	19.6
11.5	21.1	23	19.8
11.75	21.3	23.5	20.0
12	21.5	24	20.2
12.25	21.7	24.5	20.4
12.5	21.9	25	20.6
12.75	22.1	25.5	20.8
13	22.3	26	21.0
		26.5	21.1
		27	21.2
		27.5	21.4
		28	21.6
		28.5	21.8
		29	22.0