Ring Sizing Guide

Measure the circumference of your finger using paper or string and a ruler - ensure that you measure the widest part, which is usually the knuckle. Alternatively, measure the inside diameter of a ring that fits. All measurements are in millimetres.

UK Size	US Size	Inside Diameter (mm)	Inside Circumference (mm)
A	0.5	12.04	37.8
B	1	12.45	39.1
C	1.5	12.85	40.4
D	2	13.26	41.7
E	2.5	13.67	42.9
F	3	14.07	44.2
G	3.5	14.48	45.5
H	4	14.88	46.8
I	4.5	15.29	48
J	4.75	15.49	48.7
K	5.25	15.9	50
L	5.75	16.31	51.2
M	6.25	16.71	52.5
N	6.75	17.12	53.8
O	7.25	17.53	55.1
P	7.75	17.93	56.3
Q	8.25	18.34	57.6
R	8.75	18.75	58.9
S	9.25	19.15	60.2
T	9.75	19.56	61.4
U	10.25	19.96	62.7
V	10.75	20.37	64
W	11.25	20.78	65.3
X	11.75	21.18	66.6
Y	12.25	21.59	67.8
Z	12.75	21.79	68.5