R
ing Size Conversion
.
Select a size in any of the sells, the rest of the sells will show matching sizes. If sell is blank (displays "--"), click on it to see the nearest match.
USA size
0000
00
0
1/2
3/4
1
1 1/4
1 1/2
1 3/4
2
2 1/4
2 1/2
2 3/4
3
3 1/8
3 1/4
3 3/8
3 1/2
3 5/8
3 3/4
4
4 1/4
4 1/2
4 5/8
4 3/4
5
5 1/8
5 1/4
5 3/8
5 1/2
5 3/4
5 7/8
6
6 1/4
6 1/2
6 3/4
7
7 1/4
7 1/2
7 3/4
8
8 1/4
8 1/2
8 5/8
8 3/4
8 7/8
9
9 1/8
9 1/4
9 3/8
9 1/2
9 5/8
9 3/4
10
10 1/4
10 1/2
10 5/8
10 3/4
11
11 1/8
11 1/4
11 3/8
11 1/2
11 5/8
11 3/4
11 7/8
12
12 1/2
12 3/4
13
British
French
German
Japanese
Swiss
-
-
-
A
A 1/2
B
B 1/2
C
C 1/2
D
D 1/2
E
E 1/2
F
F 1/2
-
G
-
G 1/2
H
H 1/2
I
I 1/2
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
-
-
-
-
-
-
-
-
-
-
41 1/2
-
42 3/4
-
44
-
-
45 1/4
-
-
46 1/2
-
47 3/4
-
49
-
-
50
-
-
51 3/4
-
-
52 3/4
-
54
-
55 1/4
-
56 1/2
-
57 3/4
-
-
59
-
-
-
60 1/4
-
-
-
61 1/2
-
-
62 3/4
-
63
-
-
65
-
-
-
66 1/4
-
-
67 1/2
68 3/4
-
-
-
-
-
-
-
-
-
-
-
13 1/2
-
13 3/4
-
14
-
-
-
14 1/2
-
-
15
-
15 1/4
15 1/2
-
15 3/4
-
-
-
16
-
-
16 1/2
-
17
-
17 1/4
-
17 3/4
-
18
-
18 1/2
-
-
-
19
-
-
-
19 1/2
-
-
20
-
20 1/4
-
-
20 3/4
-
-
-
21
-
-
-
21 1/4
21 3/4
-
22
-
-
-
-
-
1
-
-
-
2
-
3
-
4
-
-
5
-
6
-
7
-
8
-
-
9
-
-
10
-
-
-
12
-
13
-
14
-
15
-
16
-
17
-
-
-
18
-
-
-
19
-
-
20
21
22
-
-
23
-
-
-
24
-
-
-
25
26
-
27
-
-
-
-
-
-
-
-
-
1 1/2
-
2 3/4
-
4
-
-
5 1/4
-
-
6 1/2
-
7 3/4
-
9
-
-
10
-
-
11 3/4
-
-
12 3/4
-
14
-
15 1/4
-
16 1/2
-
17 3/4
-
-
19
-
-
-
20 1/4
-
-
-
21 1/2
-
-
22 3/4
-
23 3/4
-
-
25
-
-
-
26 1/4
-
-
27 1/2
28 3/4
-
-
Diameter (inch)
Diameter (mm)
Circumference (mm)
.390
.422
.454
.474
.482
.487
-
.503
-
.520
-
.536
-
.553
-
-
-
.569
-
-
.585
-
.601
-
-
.618
-
-
-
.634
-
-
.650
-
.666
-
.683
-
.699
-
.716
-
.732
-
-
-
.748
-
-
-
.764
-
-
.781
-
.797
-
-
.814
-
-
-
-
.830
-
-
.846
.862
-
.879
9.91
10.72
11.53
11.95
12.18
12.37
12.60
12.78
13.00
13.21
13.41
13.61
13.83
14.05
14.15
14.25
14.36
14.45
14.56
14.65
14.86
15.04
15.27
15.40
15.53
15.70
15.80
15.90
16.0
16.10
16.30
16.41
16.51
16.71
16.92
17.13
17.35
17.45
17.75
17.97
18.19
18.35
18.53
18.61
18.69
18.80
18.89
19.10
19.22
19.31
19.41
19.51
19.62
19.84
20.02
20.20
20.32
20.44
20.68
20.76
20.85
20.94
21.08
21.18
21.24
21.30
21.49
21.89
22.10
22.33
31.1
33.7
36.2
37.5
38.3
38.9
39.6
40.2
40.8
41.5
42.1
42.7
43.4
44.0
44.3
44.6
44.9
45.2
45.6
45.9
46.5
47.1
47.8
48.1
48.4
49.0
49.3
49.6
50.0
50.3
50.9
51.3
51.5
52.2
52.8
53.4
54.0
54.7
55.3
55.9
56.6
57.2
57.8
58.4
58.4
59.0
59.1
59.4
59.7
60.0
60.3
60.6
60.9
61.6
62.2
62.8
63.1
63.5
64.1
64.3
64.7
65.0
65.3
65.7
66.0
66.3
66.6
67.9
68.5
69.1
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