Inside Diameter (mm) |
Circumference (mm) |
Ring Size |
12.04 |
37.80 |
A |
12.24 |
38.50 |
A 1/2 |
12.45 |
39.10 |
B |
12.65 |
39.70 |
B 1/2 |
12.85 |
40.40 |
C |
13.06 |
41.00 |
C 1/2 |
13.26 |
41.70 |
D |
13.46 |
42.30 |
D 1/2 |
13.67 |
42.90 |
E |
13.87 |
43.60 |
E 1/2 |
14.07 |
44.20 |
F |
14.27 |
44.80 |
F 1/2 |
14.48 |
45.50 |
G |
14.68 |
46.10 |
G 1/2 |
14.88 |
46.80 |
H |
15.09 |
47.40 |
H 1/2 |
15.29 |
48.00 |
I |
15.49 |
48.70 |
J |
15.70 |
49.30 |
J 1/2 |
15.90 |
50.00 |
K |
16.10 |
50.60 |
K 1/2 |
16.31 |
51.20 |
L |
16.51 |
51.90 |
L 1/2 |
16.71 |
52.50 |
M |
16.92 |
53.10 |
M 1/2 |
17.12 |
53.80 |
N |
17.32 |
54.40 |
N 1/2 |
17.53 |
55.10 |
O |
17.73 |
55.70 |
O 1/2 |
17.93 |
56.30 |
P |
18.14 |
57.00 |
P 1/2 |
18.34 |
57.60 |
Q |
18.54 |
58.30 |
Q 1/2 |
18.75 |
58.90 |
R |
18.95 |
59.50 |
R 1/2 |
19.15 |
60.20 |
S |
19.35 |
60.80 |
S 1/2 |
19.56 |
61.40 |
T |
19.76 |
62.10 |
T 1/2 |
19.96 |
62.70 |
U |
20.17 |
63.40 |
U 1/2 |
20.37 |
64.00 |
V |
20.57 |
64.60 |
V 1/2 |
20.78 |
65.30 |
W |
20.98 |
65.90 |
W 1/2 |
21.18 |
66.60 |
X |
21.39 |
67.20 |
X 1/2 |
21.59 |
67.80 |
Y |
21.79 |
68.50 |
Z |
22.00 |
69.10 |
Z 1/2 |
22.20 |
69.70 |
Z 1/2 |
22.61 |
71.00 |
Z1 |
23.01 |
72.30 |
Z2 |
23.22 |
72.90 |
Z3 |
23.62 |
74.20 |
Z4 |
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