Ring Size

Diameter (mm)	US	UK	European
14.0	3	F	44
14.2	3.25	F½	45
14.4	3.5	G	45
14.6	3.75	H	46
14.8	4	H½	47
15.1	4.25	H½-1	47
15.3	4.5	I½	47
15.5	4.75	J	49
15.7	5	J-K	49
15.9	5.25	K	50
16.1	5.5	K-L	51
16.3	5.75	L	51
16.5	6	L-L½	52
16.7	6.25	L½-M	53
16.9	6.5	M	53
17.1	6.75	M½	54
17.3	7	N	54
17.5	7.25	O	55
17.7	7.5	O-P	56
17.9	7.75	P	56
18.1	8	P	57
18.3	8.25	P½-Q	58
18.5	8.5	P½-Q2	58
18.7	8.75	R	59
18.9	9	R½-S	60
19.2	9.25	S	61
19.4	9.5	S½	61
19.6	9.75	T	62
19.8	10	T½	62
20.0	10.25	U	63
20.2	10.5	U½	64
20.4	10.75	V	64
20.6	11	V½	65
20.8	11.25	W	65
21.0	11.5	W½	66
21.2	11.75	X	67
21.4	12	X½	67
21.6	12.25	Y	68
21.8	12.5	Y½	68
22.0	12.75	Z	69
22.2	13	Z+1	70