Ring Size Measurement Guide and International Ring Size Chart
Prepare a thread or a thin slip of paper. Wrap it
around your finger and mark at the joint. Then
measure it through a scale. This is your ring
Circumference. Remember, 1cm = 10mm.
Circumference
Diameter
UK, Europe,
United States
China
SG/JP
HK
Switzerland
(mm)
(mm)
& Australia
& Canada
44.2
14.1
F½
3
6
4
6
4
44.8
14.3
G
5
5¼
45.5
14.5
G½
3½
7
7.5
46.1
14.7
H
6
6½
46.8
14.9
H½
4
8
7
9
47.4
15.1
I
9
7¾
48.0
15.3
I½
4½
8
10
48.7
15.5
J
9
49.3
15.7
J½
5
10
9
11
50.0
15.9
K
10
50.6
16.1
K½
5½
11
10
12
51.2
16.3
L
11¾
51.9
16.5
L½
6
12
11
13
12¾
52.5
16.7
M
13
12
53.1
16.9
M½
6½
13
14.5
14
53.8
17.1
N
14
54.4
17.3
N½
7
14
16
15¼
55.1
17.5
O
15
55.7
17.7
O½
7½
15
17
16½
56.3
17.9
P
16
57.0
18.1
P½
8
17
16
17¾
57.2
18.2
18
57.6
18.3
Q
58.3
18.5
Q½
8½
18
17
19
58.9
18.8
R
19
59.5
19.0
R½
9
19
18
20.5
60.2
19.2
S
20
20¼
60.8
19.4
S½
9½
19
22
61.4
19.6
T
21
21½
62.1
19.8
T½
10
20
23
62.7
20.0
U
22
21
63.4
20.2
U½
10½
22
24
22¾
64.0
20.4
V
23
64.6
20.6
V½
11
23
25
65.3
20.8
W
24
25
65.9
21.0
W½
11½
25
24
26
66.6
21.2
X
67.2
21.4
X½
12
26
25
27.75
27½
67.8
21.6
Y
68.5
21.8
Z
12½
26
28¾
69.1
22.0
Z½
69.7
22.2
13
27
30
70.4
22.4
Z+1
71.0
22.6
Z+2
13½