Circumference (mm)	Diameter (mm)	USA/ Canada	UK/ Australia	Europe
42.8	13.7	2	E	43
43.5	13.9	-	E 1/2	-
44.2	14.1	3	F	44
44.8	14.3	-	F 1/2	45
45.5	14.5	3 1/2	G	-
46.1	14.7	-	G 1/2	-
46.8	14.9	4	H	46
47.4	15.1	-	H 1/2	-
48	15.3	4 1/2	I	47
48.7	15.5	-	I 1/2	48
49.3	15.7	5	J	49
50	15.9	-	J 1/2	50
50.6	16.1	5 1/2	K	-
51.2	16.3	-	K 1/2	51
51.9	16.5	6	L	-
52.5	16.7	-	L 1/2	52
53.1	16.9	6 1/2	M	-
53.8	17.1	-	M 1/2	53
54.4	17.3	7	N	54
55.1	17.5	-	N 1/2	55
55.7	17.7	7 1/2	O	-
56.3	17.9	-	O 1/2	56
57	18.1	8	P	-
57.6	18.3	-	P 1/2	57
58.3	18.5	8 1/2	Q	58
58.9	18.8	-	Q 1/2	59
59.5	19	9	R	-