Ring sizes

UK size	US size	EU size	Diameter
F	3	44	14.1mm
G	3½	45	14.5mm
H	4	46	14.7mm
I	4½	48	15.2mm
J	5	49	15.6mm
K	5½	50	16.0mm
L	6	51	16.4mm
M	6½	53	16.8mm
N	7	54	17.2mm
O	7½	55	17.6mm
P	8	56	18.0mm