Inside diameter |
Inside circumference |
Sizes |
11.63 |
36.5 |
0 |
|
|
|
|
11.84 |
37.2 |
1⁄4 |
|
|
|
|
12.04 |
37.8 |
1⁄2 |
A |
|
|
|
12.24 |
38.5 |
3⁄4 |
A+1⁄2 |
|
|
|
12.45 |
39.1 |
1 |
B |
1 |
|
|
12.65 |
39.7 |
1+1⁄4 |
B+1⁄2 |
|
|
|
12.85 |
40.4 |
1+1⁄2 |
C |
|
|
0.4 |
13.06 |
41.0 |
1+3⁄4 |
C+1⁄2 |
|
1 |
1 |
13.26 |
41.7 |
2 |
D |
2 |
2 |
1.7 |
13.46 |
42.3 |
2+1⁄4 |
D+1⁄2 |
|
|
2.3 |
13.67 |
42.9 |
2+1⁄2 |
E |
3 |
3 |
2.9 |
13.87 |
43.6 |
2+3⁄4 |
E+1⁄2 |
|
4 |
3.6 |
14.07 |
44.2 |
3 |
F |
4 |
|
4.2 |
14.27 |
44.8 |
3+1⁄4 |
F+1⁄2 |
5 |
5 |
4.8 |
14.48 |
45.5 |
3+1⁄2 |
G |
|
|
5.5 |
14.68 |
46.1 |
3+3⁄4 |
G+1⁄2 |
6 |
6 |
6.1 |
14.88 |
46.8 |
4 |
H |
7 |
|
6.8 |
15.09 |
47.4 |
4+1⁄4 |
H+1⁄2 |
|
7 |
7.4 |
15.29 |
48.0 |
4+1⁄2 |
I |
8 |
8 |
8 |
15.49 |
48.7 |
4+3⁄4 |
J |
|
9 |
8.7 |
15.70 |
49.3 |
5 |
J+1⁄2 |
9 |
|
9.3 |
15.90 |
50.0 |
5+1⁄4 |
K |
|
10 |
10 |
16.10 |
50.6 |
5+1⁄2 |
K+1⁄2 |
10 |
|
10.6 |
16.31 |
51.2 |
5+3⁄4 |
L |
|
11 |
11.2 |
16.51 |
51.9 |
6 |
L+1⁄2 |
11 |
12 |
11.9 |
16.71 |
52.5 |
6+1⁄4 |
M |
12 |
|
12.5 |
16.92 |
53.1 |
6+1⁄2 |
M+1⁄2 |
13 |
13 |
13.1 |
17.12 |
53.8 |
6+3⁄4 |
N |
|
|
13.8 |
17.32 |
54.4 |
7 |
N+1⁄2 |
14 |
14 |
14.4 |
17.53 |
55.1 |
7+1⁄4 |
O |
|
15 |
15.1 |
17.73 |
55.7 |
7+1⁄2 |
O+1⁄2 |
15 |
|
15.7 |
17.93 |
56.3 |
7+3⁄4 |
P |
|
16 |
16.3 |
18.14 |
57.0 |
8 |
P+1⁄2 |
16 |
17 |
17 |
18.34 |
57.6 |
8+1⁄4 |
P+3⁄4 |
|
|
17.6 |
18.54 |
58.3 |
8+1⁄2 |
Q+1⁄4 |
17 |
18 |
18.3 |
18.75 |
58.9 |
8+3⁄4 |
R |
|
19 |
18.9 |
18.95 |
59.5 |
9 |
R+1⁄2 |
18 |
|
19.5 |
19.15 |
60.2 |
9+1⁄4 |
S |
|
20 |
20.2 |
19.35 |
60.8 |
9+1⁄2 |
S+1⁄2 |
19 |
21 |
20.8 |
19.56 |
61.4 |
9+3⁄4 |
T |
|
|
21.4 |
19.76 |
62.1 |
10 |
T+1⁄2 |
20 |
22 |
22.1 |
19.96 |
62.7 |
10+1⁄4 |
U |
21 |
23 |
22.7 |
20.17 |
63.4 |
10+1⁄2 |
U+1⁄2 |
22 |
|
23.4 |
20.37 |
64.0 |
10+3⁄4 |
V |
|
24 |
24 |
20.57 |
64.6 |
11 |
V+1⁄2 |
23 |
25 |
24.6 |
20.78 |
65.3 |
11+1⁄4 |
W |
|
|
25.3 |
20.98 |
65.9 |
11+1⁄2 |
W+1⁄2 |
24 |
26 |
25.9 |
21.18 |
66.6 |
11+3⁄4 |
X |
|
|
26.6 |
21.39 |
67.2 |
12 |
X+1⁄2 |
25 |
27 |
27.2 |
21.59 |
67.8 |
12+1⁄4 |
Y |
|
28 |
27.8 |
21.79 |
68.5 |
12+1⁄2 |
Y+1⁄2 |
26 |
|
28.5 |
22.00 |
69.1 |
12+3⁄4 |
Z |
|
29 |
29.1 |
22.20 |
69.7 |
13 |
Z+1⁄2 |
27 |
30 |
29.7 |
22.40 |
70.4 |
13+1⁄4 |
Z1 |
|
|
30.4 |
22.61 |
71.0 |
13+1⁄2 |
|
|
31 |
31 |
22.81 |
71.7 |
13+3⁄4 |
Z2 |
|
32 |
31.7 |
23.01 |
72.3 |
14 |
Z3 |
|
|
32.3 |
23.22 |
72.9 |
14+1⁄4 |
|
|
33 |
32.9 |
23.42 |
73.6 |
14+1⁄2 |
Z4 |
|
|
33.6 |
23.62 |
74.2 |
14+3⁄4 |
|
|
34 |
34.2 |
23.83 |
74.8 |
15 |
|
|
35 |
34.8 |
24.03 |
75.5 |
15+1⁄4 |
|
|
|
35.5 |
24.23 |
76.1 |
15+1⁄2 |
|
|
36 |
36.1 |
24.43 |
76.8 |
15+3⁄4 |
|
|
|
36.8 |
24.64 |
77.4 |
16 |
|
|
37 |
37.4 |
|
*source https://en.wikipedia.org/wiki/Ring_size