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Ring Sizing Chart

Inner Sea Sizing  inside Diameter (mm) US
A 12 1/4
A 1/2 12.2 3/4
B 12.4 1
B 1/2 12.6 1 1/4
C 12..8 1 1/2
C 1/2 13 1 3/4
D 13.2 2
D 1/2 13.4 2 1/4
E 13.6 2 1/2
E 1/2 13.8 2 3/4
F 14 3
F 1/2 14.2 3 1/8
G 14.4 3 3/8
G 1/2 14.6 3 5/8
H 14.8 3 3/4
H 1/2 15 4
I 15.2 4 1/4
I 1/2 15.4 4 1/2
J 15.6 4 3/4
J 1/2 15.8 5
K 16 5 1/4
K 1/2 16.2 5 1/2
L 16.4 5 3/4
L 1/2 16.6 6
M 16.8 6 1/4
M 1/2 17 6 1/2
N 17.2 6 3/4
N 1/2 17.4 7
O 17.6 7 1/4
O 1/2 17.8 7 1/2
P 18 7 3/4
P 1/2 18.2 8
Q 18.4 8 1/4
Q 1/2 18.6 8 1/2
R 18.8 8 3/4
R 1/2 19 9
S 19.2 9 1/4
S 1/2 19.4 9 1/2
T 19.6 9 3/4
T 1/2 19.8 10
U 20 10 1/4
U 1/2 20.2 10 1/2
V 20.4 10 3/4
V 1/2 20.6 11
W 20.8 11 1/4
W 1/2 21 11 1/2
X 21.2 11 3/4
X 1/2 21.4 12
Y 21.6 12 1/4
Y 1/2 21.8 12 1/2
Z 22 12 3/4
Z 1/2 22.2 13
1 22.4 13 1/4
1 1/2 22.6 13 1/2
2 22.8 13 3/4
2 1/2 23.2 14 1/4
3 23.4 14 1/2
3 1/2 23.6 14 3/4
4 23.8 15