UK size

US size

EU size

Diameter

F 3 44 14.1mm
G 3½ 45
14.5mm
H 4 46
14.7mm
I 48 15.2mm
J 5 49 15.6mm
K 50 16.0mm
L 6 51 16.4mm
M 53 16.8mm
N 7 54 17.2mm
O 55 17.6mm
P 8 56 18.0mm