Each brand varies in sizes. Some are more universal than others. Converse tend to run bigger, making most of us get a half or one size smaller than usual (i'm a size 10 but get a size 9 in converse). It could just be the way they're made. read more
Eachcountry has different different size system like UK 7 size is equal to US 7.5 and a woman shoe size 8 is equal to men's 6.5 . So just choose your Converse Shoes by trying them because it varies from country to contry. read more
Converse notes that all of their CT All-Stars are unisex sizing, meaning whatever the size is, they will give you the men’s and women’s size for that specific pair. The official Converse site states they run a half-size larger than your normal shoe. read more
That said, Converse's size converstion to EU sizes is a bit screwy, so you would have to buy a size larger than your normal EU size (if you know what that is), but a size smaller than your normal US size. read more