Where can you find a shoe size chart that compares boys to men?

Kid's shoe sizing isn't separated by gender. However, kid's sizes do follow the men's sizing chart. In the US men's shoe sizes start at 7, which is equivalent to a kid's 7.

A child's size 6 then is essentially a men's size 6. Women's sizes in the US are labeled between 1 and 1.5 times the size of men's shoes sizes. Unfortunately, there is no absolute industry standard for sizes. This means that a 7 in one brand may be different than a 7 in another brand. Before buying shoes online, find an outlet to try the shoes on first to find a good fit.