Agreed, this is going to be the best indicator for people to judge online.
OP should be wary of people suggesting X sizes down from shoe size, as I believe many (if not most) people wear shoes that are technically too big for them, especially if they have wide feet. I can almost guarantee that anyone wearing a skate 3+ sizes smaller than their shoe size, has a lot of room between the tip of their toes and the end of their shoe.