Ring Size guide

Diameter (mm)	UK	US Size
11.95	A	1/2
12.18	A 1/2	3/4
12.37	B	1
12.60	B 1/2	1 1/4
12.78	C	1 1/2
13.00	C 1/2	1 3/4
13.21	D	2
13.41	D 1/2	2 1/4
13.61	E	2 1/2
13.83	E 1/2	2 3/4
14.05	F	3
14.15	F 1/2	3 1/8
14.36	G	3 3/8
14.56	G 1/2	3 5/8
14.65	H	3 3/4
14.86	H 1/2	4
15.04	I	4 1/4
15.27	I 1/2	4 1/2
15.40	J	4 5/8
15.70	J 1/2	5
15.80	K	5 1/8
16.0	K 1/2	5 3/8
16.10	L	5 1/2
16.41	L 1/2	5 7/8
16.51	M	6
16.71	M 1/2	6 1/4
16.92	N	6 1/2
17.13	N 1/2	6 3/4
17.35	O	7
17.45	O 1/2	7 1/4
17.75	P	7 1/2
17.97	P 1/2	7 3/4
18.19	Q	8
18.35	Q 1/2	8 1/4
18.61	R	8 5/8
18.80	R 1/2	8 7/8
19.10	S	9 1/8
19.31	S 1/2	9 3/8
19.51	T	9 5/8
19.84	T 1/2	10
20.02	U	10 1/4
20.20	U 1/2	10 1/2
20.32	V	10 5/8
20.68	V 1/2	11
20.76	W	11 1/8
20.94	W 1/2	11 3/8
21.18	X	11 5/8
21.30	X 1/2	11 7/8
21.49	Y	12
21.69	Y 1/2	12 1/4
21.89	Z	12 1/2
22.10	Z 1/2	12 3/4