There is now a convenient site for this https://www.prepler.com/college-loan-calculator You do not need to do it yourself because you may not take into account something and ruin your mood. Moreover, it is a very monotonous activity that takes too much time. Look, there is a pretty user-friendly interface.
How to Calculate College Tuition Fees Correctly? I mean, how to account for all payments and important expenses, if they are divided according to the information on the college website.