I have alopecia areata. i was wondering what are the chances of me passing it to my kids in the future?

Possibly: Because there is a genetic predisposition to autoimmune disorders such as alopecia areata this could be passed on to your children. More study is being conducted on this issue:http://www.sciencedaily.com/releases/2010/06/100630132744.htm

Very unlikely: Unlike other genetic disorder where there is clear pattern of passage from parent to child, AA does not have this. From a genetic perspective its quite complicated. In fact most person's with AA don't have parents with the disease. Also, even with identical twins if one has AA there is a 55% chance that the other doesn't(and identical twins have the same genes!)