Europe · 25 sizes

EU / ISO 8653 Ring Size Chart.

The size is the inner circumference in millimetres. No conversion needed — it is the measurement.

Every row is computed from inner circumference, so the diameter and the equivalents in other systems are consistent all the way down.

EU / ISO 8653	Diameter	Circumference	Indian	US / Canada	UK / Australia	Japan / China	Swiss
44	14.01 mm	44.0 mm	3	3	F½	4	4
45	14.32 mm	45.0 mm	5	3½	G	6	5
46	14.64 mm	46.0 mm	6	3½	H	7	6
47	14.96 mm	47.0 mm	7	4	H½	8	7
48	15.28 mm	48.0 mm	8	4½	I½	9	8
49	15.60 mm	49.0 mm	9	5	J½	10	9
50	15.92 mm	50.0 mm	10	5½	K	11	10
51	16.23 mm	51.0 mm	11	5½	L	12	11
52	16.55 mm	52.0 mm	13	6	L½	13	12
53	16.87 mm	53.0 mm	14	6½	M½	14	13
54	17.19 mm	54.0 mm	15	7	N	15	14
55	17.51 mm	55.0 mm	16	7½	O	16	15
56	17.83 mm	56.0 mm	17	7½	P	18	16
57	18.14 mm	57.0 mm	18	8	P½	19	17
58	18.46 mm	58.0 mm	19	8½	Q½	20	18
59	18.78 mm	59.0 mm	20	9	R	21	19
60	19.10 mm	60.0 mm	22	9	S	22	20
61	19.42 mm	61.0 mm	23	9½	S½	23	21
62	19.74 mm	62.0 mm	24	10	T½	24	22
63	20.05 mm	63.0 mm	25	10½	U½	25	23
64	20.37 mm	64.0 mm	26	11	V	26	24
65	20.69 mm	65.0 mm	27	11	W	27	25
66	21.01 mm	66.0 mm	28	11½	W½	—	26
67	21.33 mm	67.0 mm	29	12	X½	—	27
68	21.65 mm	68.0 mm	—	12½	Y	—	—

Convert EU / ISO 8653 to another system

A jeweller's own chart takes precedence over this one — makers differ by a fraction of a size and a proper mandrel beats a paper strip. Fingers also swell through the day and in heat, so measure in the evening. How to measure at home →