us size 12.5 boys shoes, what would the conversion size be to au mens size?

Answer 1

This converts to approximately UK - Mens 11.5, European - Mens 46.3.
http://www.outdoorgear.co.uk/Tools/FW_size_converter.htm
I am not sure how accurate it is, but I think it is accurate.
You can go to www.ebay.com and find shoe of this size and see other sizes.
Thank you.