First, select a ring that fits for the finger. Next, measure the diameter opening of that ring. Use the chart below to determine your ring size.
Internal diameter (mm)
Ring Size Conversion Chart
J 48.7
K 50.0
L 51.2
M 52.5
N 53.8
O 55.1
P 56.3
Q 57.6
R 58.9
S 60.2
T 61.4
U 62.7
V 64.0
W 65.3
X 66.6
Y 67.8
Z 68.5
A 37.8
B 39.1
C 40.4
D 41.7
E 42.9
F 44.2
G 45.5
H 46.8
I 48.0
