Ring Sizing
Conversion Chart
US,Canada
4
4.25
4.5
4.75
5
5.25
5.5
5.75
6
6.25
6.5
6.75
7
7.25
7.5
7.75
8
8.25
8.5
8.75
9
9.25
9.5
9.75
10
10.25
10.5
10.75
11
11.25
11.5
11.75
12
12.25
12.5
12.75
13
13.25
13.5
13.75
14
14.25
14.5
14.75
15
15.25
15.5
15.75
16
UK, Australia, Ireland, New Zealand
H
H.5
I
J
J 1/2
K
K 1/2
L
L 1/2
M
M 1/2
N
N 1/2
O
O 1/2
P
P 1/2
Q
Q 1/2
R
R 1/2
S
S 1/2
T
T 1/2
U
U 1/2
V
V 1/2
W
W 1/2
X
X 1/2
Y
Z
Z 1/2
Z1
Z2
Z3
Z4
Japan, India, China, South Africa
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Spain, Italy, Netherlands, Switzerland
6.75
7.5
8
8.75
9.25
10
10.5
11.25
11.75
12.5
13.25
13.75
14.5
15
15.75
16.25
17
17.5
18.25
19
19.5
20.25
20.75
21.5
22
22.75
23.25
24
24.75
25.25
26
26.5
27.25
27.75
28.5
29
29.75
30.5
31
31.75
32.25
33
33.5
34.25
34.75
35.5
36.25
36.75
37.5
Inside Diameter/Circumference(mm)
14.88 & 46.8
15.09 & 47.4
15.29 & 48
15.49 & 48.7
15.7 & 49.3
15.9 & 50
16.1 & 50.6
16.31 & 51.2
16.51 & 51.9
16.71 & 52.5
16.92 & 53.1
17.12 & 53.8
17.32 & 54.4
17.53 & 55.1
17.73 & 55.7
17.93 & 56.3
18.14 & 57
18.34 & 57.6
18.54 & 58.3
18.75 & 58.9
18.95 & 59.5
19.15 & 60.2
19.35 & 60.8
19.56 & 61.4
19.76 & 62.1
19.96 & 62.7
20.17 & 63.4
20.37 & 64
20.57 & 64.6
20.78 & 65.3
20.98 & 65.9
21.18 & 66.6
21.39 & 67.2
21.59 & 67.8
21.79 & 68.5
22 & 69.1
22.2 & 69.7
22.4 & 70.4
22.61 & 71
22.81 & 71.7
23.01 & 72.3
23.22 & 72.9
23.42 & 73.6
23.62 & 74.2
24.23 & 76.1
24.03 & 75.5
24.23 & 76.1
24.43 & 76.8
24.64 & 77.4