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PUZZLE RING MAKER .COM
Ring Size Conversion Chart
US
UK/Oz
Inner
Diameter
Diameter
Inside
Circumference
Circumference
4
H
14.88 mm
46.7 mm
4.25
H 1/2
15.09 mm
47.4 mm
4.5
I
15.29 mm
48.0 mm
4.75
J
15.49 mm
48.6 mm
5
J 1/2
15.70 mm
49.3 mm
5.25
K
15.90 mm
49.9 mm
5.5
K 1/2
16.11 mm
50.6 mm
5.75
L
16.31 mm
51.2 mm
6
L 1/2
16.51 mm
51.8 mm
6.25
M
16.72 mm
52.5 mm
6.5
M 1/2
16.92 mm
53.1 mm
6.75
N
17.12 mm
53.8 mm
7
N 1/2
17.33 mm
54.4 mm
7.25
O
17.53 mm
55.0 mm
7.5
O 1/2
17.73 mm
55.7 mm
7.75
P
17.94 mm
56.3 mm
8
P 1/2
18.14 mm
56.9 mm
8.25
Q
18.34 mm
57.6 mm
8.5
Q 1/2
18.55 mm
58.2 mm
8.75
R
18.75 mm
58.9 mm
9
R 1/2
18.95 mm
59.5 mm
9.25
S
19.16 mm
60.1 mm
9.5
S 1/2
19.36 mm
60.8 mm
9.75
T
19.56 mm
61.4 mm
US
UK/Oz
Inner
Diameter
Diameter
Inside
Circumference
Circumference
10
T 1/2
19.77 mm
62.1 mm
10.25
U
19.97 mm
62.7 mm
10.5
U 1/2
20.17 mm
63.3 mm
10.75
V
20.38 mm
64.0 mm
11
V 1/2
20.58 mm
64.6 mm
11.25
W
20.78 mm
65.3 mm
11.5
W 1/2
20.99 mm
65.9 mm
11.75
X
21.19 mm
66.5 mm
12
X 1/2
21.39 mm
67.2 mm
12.25
Y
21.60 mm
67.8 mm
12.5
Z
21.80 mm
68.5 mm
12.75
Z 1/2
22.00 mm
69.1 mm
13
-
22.21 mm
69.7 mm
13.25
Z1
22.41 mm
70.4 mm
13.5
-
22.61 mm
71.0 mm
13.75
Z2
22.82 mm
71.6 mm
14
Z3
23.02 mm
72.3 mm
14.25
-
23.22 mm
72.9 mm
14.5
Z4
23.43 mm
73.6 mm
14.75
-
23.63 mm
74.2 mm
15
-
23.84 mm
74.8 mm
15.25
-
24.04 mm
75.5 mm
15.5
-
24.24 mm
76.1 mm
15.75
-
24.45 mm
76.8 mm