Model four nominal annual bills for entered tuition, housing and books with an assumed inflation rate; not an institutional cost of attendance.
Add entered current annual tuition and fees, room and board, and books and supplies. These are selected expenses only: transportation, personal expenses, aid, taxes and borrowing costs are excluded. All amounts are USD.
The same entered nonnegative inflation assumption grows the combined annual amount. Four bills occur at the beginning of college years: wait, wait plus one, wait plus two and wait plus three. Starting now applies no waiting-period inflation, and a zero rate keeps annual bills constant.
Total projected four-year cost is the sum of those four annual bills. Zero selected expenses remain zero; negative expense inputs and fractional waiting years are invalid. Current school-specific prices, financial aid eligibility and guaranteed outcomes are not estimated.
A school determines its own cost of attendance and net price using additional categories and individual circumstances. This selected-expense scenario is neither of those official figures. Inflation is a user-entered assumption, not verified historical school-cost data; deflation is outside the supported nonnegative-rate model.