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Simply change the selectors below to see the equivalent sizes.
USA size
Diam. inch.
Diam. mm
Circum. mm
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
.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
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
---
---
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