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Convert Sizes By Country
Diameter (mm)
diameter (inches)
circumference (mm)
circumference (inches)
British/Australian
21.08
13.83
0.544
43.45
E 1/2
21.18
14.05
0.553
44.14
F
21.24
14.15
0.557
44.45
F 1/2
21.3
14.25
0.561
44.77
F 3/4
21.49
14.36
0.565
45.11
G
21.69
14.45
0.569
45.4
G 1/4
21.89
14.56
0.573
45.74
G 1/2
22.1
14.65
0.577
46.02
H
22.33
14.86
0.585
46.68
H 1/2
22.6
15.04
0.592
47.25
I
22.69
15.27
0.601
47.97
I 1/2
22.92
15.4
0.606
48.38
J
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