Here’s a handy calculator that you can run the numbers through: http://www.finaid.org/calculators/awardletteradvanced.phtml
@Erin’s Dad - Common reasons for qualifying for in-state rates in two states include having parents who live in two different states, living in an adjacent state that has a tuition agreement (sometimes for only a limited number of majors), and living in an adjacent county in the next state. Not every public college/university offers this, but some do.