Ring Size Chart

Inside Diameter in Millimeters (mm)	Ring Size Australia & UK	Ring Size Canada & USA
12.00	A
12.20	A.5
12.40	B
12.65	B.5	1
12.85	C
13.00	C.5	1.5
13.20	D
13.40	D.5	2
13.60	E
13.80	E.5	2.5
13.95	F
14.15	F.5	3
14.35	G
14.55	G.5	3.5
14.75	H
14.95	H.5	4
15.15	I
15.35	I.5	4.5
15.55	J
15.75	J.5	5
15.95	K
16.15	K.5	5.5
16.35	L
16.55	L.5	6
16.75	M
16.95	M.5	6.5
17.15	N
17.35	N.5	7

Inside Diameter in Millimeters (mm)	Ring Size Australia & UK	Ring Size Canada & USA
17.55	O
17.75	O.5	7.5
17.95	P
18.15	P.5	8
18.35	Q
18.55	Q.5	8.5
18.70	R
18.90	R.5
19.05	S	9
19.25	S.5
19.45	T	9.5
19.65	T.5
19.85	U	10
20.05	U.5
20.25	V	10.5
20.45	V.5
20.65	W	11
20.85	W.5
20.95	X	11.5
21.15	X.5
21.35	Y	12
21.75	Z	12.5
22.15	Z+1
22.45	Z+2
22.75	Z+3
23.15	Z+4
23.55	Z+5
24.55	Z+6