International Ring Sizes

INTERNATIONAL RING SIZE EQUIVALENTS

CDN. / U.S.	Diameter (in millimeters)	U.K./South Africa	Japanese	Circumference (in millimeters)
4	14.8mm	H 1/2	7	46.5mm
4 1/2	15.2mm	I 1/2	8	48mm
5	15.6mm	J 1/2	9	49mm
5 1/2	16mm	L	10	50.5mm
6	16.4mm	M	12	52mm
6 1/2	16.8mm	N	13	53mm
7	17.3mm	O	14	54.5mm
7 1/2	17.7mm	P	15	55.5mm
8	18.1mm	Q	16	57mm
8 1/2	18.5mm	Q 1/2	17	58mm
9	18.9mm	R 1/2	18	59.5mm
9 1/2	19.3mm	S 1/2	20	61mm
10	19.7mm	T 1/2	21	62mm
10 1/2	20.1mm	U 1/2	22	63.5mm
11	20.6mm	V 1/2	24	64.5mm
11 1/2	21mm	W 1/2	25	66mm
12	21.4mm	Y	26	67.5mm
12 1/2	21.8mm	Z	27	68.5mm
13	22.2mm	Z+1	28	70mm
13 1/2	22.6mm	Z+2	29	71mm
14	23mm	Z+3	31	72.5mm
14 1/2	23.4mm	Z+4	32	74mm
15	23.9mm	Z+5	33	75mm

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