Ring Measurement

Diameter (mm)	Circumference (mm)	US & Canada	UK/AU	Europe
14.1	44.2	3	F	44
14.5	45.5	3.5	G	45
14.9	46.8	4	H	47
15.3	48.0	4.5	I	48
15.7	49.3	5	J	49
16.1	50.6	5.5	K	50
16.5	51.9	6	L	52
16.9	53.1	6.5	M	53
17.3	54.4	7	N	54
17.7	55.7	7.5	O	56
18.1	57.0	8	P	57
18.5	58.3	8.5	Q	58
18.9	59.5	9	R	60
19.4	60.8	9.5	S	61
19.8	62.1	10	T	62
20.2	63.4	10.5	U	63
20.6	64.6	11	V	64
21.0	65.9	11.5	W	66
21.4	67.2	12	X	67