RING SIZE CONVERTER

INSIDE DIAMETER	US	UK	GERMANY	SPAIN	FRANCE	ITALY	JAPAN
14 mm	3	F	44 (14.0)	4	44	4	4
14.5 mm	3.5	G	N/A	N/A	N/A	5,5	5
15 mm	4	H	47 (15.0)	6,5	46.5	7	7
15.3 mm	4.5	I	48 (15.3)	8	48	8	8
15.6 mm	5	J	49 (15.6)	9,5	49.5	9	9
16.2 mm	5.5	K	51 (16.2)	10,5	50.5	10	10
16.6 mm	6	L	52 (16.6)	12	52	11	11
16.9 mm	6.5	M	53 (16.9)	13,5	53	12,5	13
17.2 mm	7	N	54 (17.2)	14,5	54.5	14	14
17.8 mm	7.5	O	56 (17.8)	16	55.5	15	15
18.1 mm	8	P	57 (18.1)	17	57	16	16
18.5 mm	8.5	Q	58 (18.5)	18,5	58	17,5	17
19.1 mm	9	R	60 (19.1)	20	59.5	19	18
19.4 mm	9.5	S	61 (19.4)	21	61	20	19
19.7 mm	10	T	62 (19.7)	22,5	62	21,5	20
20.4 mm	10.5	U	64 (20.4)	23,5	63.5	23	22
20.7 mm	11	V	65 (20.7)	25	64.5	24	23
21.0 mm	11.5	W	66 (21.0)	26	66	25	24
21.6 mm	12	X	68 (21.6)	27,5	67	26,5	25
22.0 mm	12.5	Y	69 (22.0)	29	68.5	28	26
22.3 mm	13	Z	70 (22.3)	30	69.5	28,5	27
22.9 mm	13.5	Z+2	72 (22.9)	32	71	32	N/A
23.2 mm	14	Z+3	73 (23.2)	33	72.5	33	N/A
23.6 mm	14.5	Z+4	74 (23.6)	34,5	73.5	N/A	N/A
	15	Z+5	N/A	35	75	35	N/A