UK Size to US Size

Convert UK Size to US Size with international size equivalence charts. Free online size converter.

Based on published international size equivalence charts.

US	UK	EU	Japan
3	F	44	1
3.25	F½	44.5	2
3.5	G	45	3
3.75	G½	45.5	4
4	H	46	5
4.25	H½	46.5	6
4.5	I	47	7
4.75	I½	47.5	8
5	J	48	9
5.25	J½	48.5	10
5.5	K	49	11
5.75	K½	49.5	12
6	L	50	13
6.25	L½	50.5	14
6.5	M	51	15
6.75	M½	51.5	16
7	N	52	17
7.25	N½	52.5	18
7.5	O	53	19
7.75	O½	53.5	20
8	P	54	21
8.25	P½	54.5	22
8.5	Q	55	23
8.75	Q½	55.5	24
9	R	56	25
9.25	R½	56.5	26
9.5	S	57	27
9.75	S½	57.5	28
10	T	58	29
10.25	T½	58.5	30
10.5	U	59	31
10.75	U½	59.5	32
11	V	60	33
11.25	V½	60.5	34
11.5	W	61	35
11.75	W½	61.5	36
12	X	62	37

The formula

Sizes map through equivalence charts, not a single multiplier. Use the chart above to find the matching size.