Ring Size Chart

Compare average industry standard ring sizes across US, UK, EU, JP, and CN systems.

US	UK	EU	JP	CN	Diameter	Circumference
3	F	44	4	4	14.1 mm	44.2 mm
3.5	G	45	5	5	14.5 mm	45.5 mm
4	H	47	7	7	14.9 mm	46.8 mm
4.5	I	48	8	8	15.3 mm	48 mm
5	J	49	9	9	15.7 mm	49.3 mm
5.5	K	51	10	10	16.1 mm	50.6 mm
6	L	52	12	12	16.5 mm	51.9 mm
6.5	M	53	13	13	16.9 mm	53.1 mm
7	N	54	14	14	17.3 mm	54.4 mm
7.5	O	56	15	15	17.7 mm	55.7 mm
8	P	57	16	16	18.1 mm	57 mm
8.5	Q	58	17	17	18.5 mm	58.3 mm
9	R	60	18	18	19 mm	59.5 mm
9.5	S	61	19	19	19.4 mm	60.8 mm
10	T	62	20	20	19.8 mm	62.1 mm
10.5	U	64	22	22	20.2 mm	63.4 mm
11	V	65	23	23	20.6 mm	64.6 mm
11.5	W	66	24	24	21 mm	65.9 mm
12	X	68	25	25	21.4 mm	67.2 mm
12.5	Y	69	26	26	21.8 mm	68.5 mm
13	Z	70	27	27	22.2 mm	69.7 mm

This tool provides an estimated ring size only. Double-check before buying, especially for expensive, custom, or engagement rings.