www. A l d e r s o n s J e w e l l e r s .c o.u k

---

This is intended to serve as an approximate guide comparing ring sizes.

UK sizes	European sizes	USA sizes	Continental sizes	Internal Ring diameter (MM)
K	50	5 ¼	10	16.0
L	51	5 ¾	11	16.4
M	52	6 ¼	12	16.8
N	53	6 ¾	13.5	17.2
O	55	7	15	17.6
P	56	7 ½	16	18.0
Q	57	8	17	18.4
R	59	8 ½	18.5	18.8
S	60	9	20	19.2
T	61	9 ½	21	19.5
U	62	10	22.5	19.9
V	64	10 ½	24	20.3
W	65	11	25	20.7
X	66	11 ½	26	21.1
Y	67	12		21.5
Z	68	12 ½		21.9
Z +1	69			22.3
Z +2	70			22.7