Ring Size Guide
|
UK size
|
US size
|
Inside diameter
(mm)
|
Inside circumference
(mm)
|
|
A
|
1/2
|
12.04
|
37.8
|
|
B
|
1
|
12.45
|
39.1
|
|
C
|
1 - 1/2
|
12.85
|
40.4
|
|
D
|
2
|
13.26
|
41.7
|
|
E
|
2 - 1/2 | 13.67 | 42.9 |
|
F
|
3 | 14.07 | 44.2 |
|
G
|
3 - 1/2 | 14.48 | 45.5 |
|
H
|
4 | 14.88 | 46.8 |
|
I
|
4 - 1/2 | 15.29 | 48 |
|
J
|
4 - 3/4 | 15.49 | 48.7 |
|
K
|
5 - 1/4 | 15.9 | 50 |
|
L
|
5 - 3/4 | 16.31 | 51.2 |
|
M
|
6 - 1/4 | 16.71 | 52.5 |
|
N
|
6 - 3/4 | 17.12 | 53.8 |
|
O
|
7 - 1/4 | 17.12 | 55.1 |
|
P
|
7 - 3/4 | 17.93 | 56.3 |
|
Q
|
8 - 1/4 | 18.34 | 57.6 |
|
R
|
8 - 3/4 | 18.75 | 58.9 |
|
S
|
9 - 1/4 | 19.15 | 60.2 |
|
T
|
9 - 3/4 | 19.56 | 61.4 |
|
U
|
10 - 1/4 | 19.96 | 62.7 |
|
V
|
10 - 3/4 | 20.37 | 64 |
|
W
|
11 - 1/4 | 20.78 | 65.3 |
|
X
|
11 - 3/4 | 21.18 | 66.6 |
|
Y
|
12 - 1/4 | 21.59 | 67.8 |
|
Z
|
12 - 1/2 | 21.79 | 68.5 |