Fingers tend to be larger at the end of the day, so please bear this in mind when you are trying on rings. Do not try on a ring if your hands are cold because your fingers may be up to half a size smaller. A ring should fit snugly on your finger but still be loose enough to remove without too much tugging.
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UK, Ireland, Australia, New Zealand
H
H½
I
J
J½
K
K½
L
L½
M
M½
N
N½
O
O½
P
P½
Q
Q½
R
R½
S
S½
T
T½
U
U½
V
V½
W
W½
USA, Canada
4
4¼
4½
4¾
5
5¼
5½
5¾
6
6¼
6½
6¾
7
7¼
7½
7¾
8
8¼
8½
8¾
9
9¼
9½
9¾
10
10¼
10½
10¾
11
11¼
11½
Inside Diameter in mm
14.9
15.1
15.3
15.5
15.7
15.9
16.1
16.3
16.5
16.7
16.9
17.1
17.3
17.5
17.7
17.9
18.1
18.3
18.5
18.7
18.9
19.1
19.3
19.5
19.7
19.9
20.1
20.3
20.5
20.7
20.9
Inside Circumference in mm (Europe)
46.7
47.4
48.0
48.7
49.3
49.9
50.6
51.2
51.8
52.5
53.1
53.8
54.4
55.0
55.7
56.3
56.9
57.6
58.2
58.9
59.5
60.1
60.8
61.4
62.1
62.7
63.3
64.0
64.7
65.3
65.9