Generally, you can just minus a US women’s shoe size by 1.5 or 2 to get the youth size. For example, a 4.5-5in women’s shoes is equivalent to a size 3 in youth, while a women’s 5-5.5 is a size 3.5 for youths.
| Youth Size | Women’s Size | Size in Inches |
|---|---|---|
| 3Y | 4.5-5 | 8 3/8 |
| 3.5Y | 5-5.5 | 8 1/2 |