Size Charts

Diameter	USA & Canada	Franch EU	UK & Australia	Japan	Switzerland
13 mm	1¾	41	C½	2	1
13.26 mm	2	41.7	D		1.75
13.5 mm	2¼	42.3	D½	3	2.25
13.67 mm	2½	42.9	E		3
13.87 mm	2¾	43.6	E½	4	3.5
14 mm	3	44.2	F	5	4.25
14.27 mm	3¼	44.8	F½		4.75
14.5 mm	3½	45.5	G	6	5.5
14.68 mm	3¾	46.1	G½	7	6
14.88 mm	4	46.8	H		6.75
15 mm	4¼	47.4	H½	8	7.5
15.29 mm	4½	48	I		8
15.5 mm	4¾	48.7	J	9	8.75
15.7 mm	5	49.3	J½		9.25
15.9 mm	5¼	50	K	10	10
16 mm	5½	50.6	K½		10.5
16.31 mm	5¾	51.2	L	11	11.25
16.5 mm	6	51.9	L½	12	11.75
16.71 mm	6¼	52.5	M	13	12.5
17 mm	6½	53.1	M½		13.25
17.12 mm	6¾	53.8	N	14	13.75
17.32 mm	7	54.4	N½		14.5
17.5 mm	7¼	55.1	O	15	15
17.73 mm	7½	55.7	O½		15.75
18 mm	7¾	56.3	P	16	16.25
18.14 mm	8	57	P½		17
18.34 mm	8¼	57.6	Q	17	17.5
18.5 mm	8½	58.3	Q½		18.25
18.75 mm	8¾	58.9	R	18	19
19 mm	9	59.5	R½		19.5
19.15 mm	9¼	60.2	S	19	20.25
19.35 mm	9½	60.8	S½		20.75
19.5 mm	9¾	61.4	T	20	21.5
19.76 mm	10	62.1	T½	21	22
20 mm	10¼	62.7	U	22	22.75
20.17 mm	10½	63.4	U½		23.25
20.37 mm	10¾	64	V	23	24
20.5 mm	11	64.6	V½		24.75
20.78 mm	11¼	65.3	W	24	25.25
21 mm	11½	65.9	W½		26
21.18 mm	11¾	66.6	X	25	26.5
21.39 mm	12	67.2	X½		27.25
21.5 mm	12¼	67.8	Y	26	27.75
21.79 mm	12½	68.5	Z		28.5
22 mm	12¾	69.1	Z½	27	29
22.2 mm	13	69.7			29.75
22.5 mm	13¼	70.4	Z1		30.5
22.61 mm	13½	71	.		31
22.81 mm	13¾	71.7	Z2		31.75
23 mm	14	72.3	Z3		32.25
23.22 mm	14¼	72.9			33
23.5 mm	14½	73.6	Z4		33.5
23.62 mm	14¾	74.2			34.25
23.83 mm	15	74.8			34.75
24 mm	15¼	75.5			35.5
24.23 mm	15½	76.1			36.25
24.5 mm	15¾	76.8			36.75
24.64 mm	16	77.4			37.5