Do colleges redo GPAs?

Right now my GPA is a 3.9, except it would be higher if I went to a different school. I have a lot of 90s and 91s, which is considered a B+ in my school, but in other schools around our area they are considered A-. I'm looking to go to a good college, so will colleges recount GPAs since schools have different GPA systems? Thanks for your answer!