Although there is no perfect solution to finding the right shoe size (except for trying them on), we have put together a guide to aid you in determining the correct size. Below, you will find the sizing conversion for European to US sizes. In addition to this, if you are trying to convert Children's to Men's or Women's sizing, here are a few tips: Children's sizing is the same as Men's (ie., a Children's 6 is equal to a Men's 6), and Women's sizing is 1.5 - 2 sizes different (ie., Children's 5 is equal to a Women's 6.5-7).

Keep in mind that this is a reference guide to get you pointed in the right direction. There is no substitute for trying shoes on before you buy them. Each style within each brand can fit differently.

CHILDREN'S SIZES

EU	US	UK	mm
24	6-6.5	7	150
25	7-7.5	8	160
26	8-8.5	8,5	165
27	9-9.5	9	170
28	10-10.5	10	180
29	11-11.5	11	185
30	12-12.5	11,5	190
31	13-13.5	13	200
32	1-1.5	13,5	205
33	2-2.5	1	210
34	3-3.5	2	220
35	4-4.5	2,5	225
36	5-5.5	3,5	230
37	6-6.5	4,5	240
38	7-7.5	5	245
39	8-8.5	5,5	250

Smartwool Sock Size Chart 

Size	US Men	US Women	Euro	UK
Small	3-5.5	4-6.5	34-37	2-4.5
Medium	6-8.5	7-9.5	38-41	5-7.5
Large	9-11.5	10-12.5	42-45	8-10.5
XL	12-14.5	N/A	46-49	11-13.5

Darn Tough Sock Size Chart 

Size	US Men	US Women	Euro	UK
XS	2.5-5	4.5-7	35-37.5	2.5-4.5
Small	5.5-7.5	7.5-9.5	33.8-40.5	5-7
Medium	8-9.5	10-11.5	41-42.5	7.5-9
Large	10-12	14-Dec	43-45.5	9.5-11.5
XL	12.5-14.5	-	46-49.5	14-Dec
XXL	15-17	-	50-53	15-16