Please measure, in millimetres, either your finger’s circumference or a ring’s inner diameter. A snug-fitting ring or a flexible tape measure will make this effortless.

Next, consult the size chart to find your corresponding ring size.

✦Size Conversion Chart

US Size	UK Size (BS)	EU Size (JIS/ISO)	JP Size (JCS)	Circumference (mm)	Diameter (mm)
3	F	44	4	44	14
3.5	G	45	5	45	14.4
3.5–4	G–H	46	6	46.1	14.7
4	H–I	47	7	47.1	15
4.5–5	I–J	48	8	48.2	15.4
5	J	49	9	49.2	15.7
5.5	K	50	10	50.3	16
6	L	51	11	51.3	16.4
6.5	L–M	52	12	52.4	16.7
6.5–7	M–N	53	13	53.4	17
7–7.5	N–O	55	14	54.5	17.4
7.5–8	O–P	56	15	55.5	17.7
8	P	57	16	56.6	18
8.5	Q	58	17	57.6	18.4
9	R	59	18	58.6	18.7
9.5	S	60	19	59.7	19
10	T	61	20	60.7	19.4
10–10.5	U	62	21	61.8	19.7
10.5	V	63	22	62.8	20
11	W	64	23	63.9	20.4
11.5	X	65	24	64.9	20.7
12	Y	66	25	66	21
12.5	Z	67	26	67.1	21.4
13	Z + 1	68	27	68.1	21.7

*Please note that finger size can fluctuate depending on the time of day and your physical condition, so we recommend measuring it several times.