College Cost Calculator: What Four Years Will Really Cost

Most people plan against today's price. That is the mistake. The bill arrives years from now, and college costs have a long history of rising faster than general inflation, which changes the size of the problem considerably.

The compounding nobody plans for

Start with a four-year-old and a school that currently costs $28,000 a year all in. Fourteen years of 5% increases turns that first-year bill into about $55,400. The second year is $58,200, the third $61,100, the fourth $64,200. Add them up and you are looking at roughly $239,000 for one child at one school.

The assumption is doing most of the work here, so test it. Drop the rate to 3% and the four-year total falls to about $177,000. Push it to 6% and it climbs to about $277,000. Run both ends before you settle on a savings target, because a plan built on the optimistic number is not really a plan.

Sticker price is not what most families pay

Published cost of attendance is a starting point, not a forecast. Grant aid, need-based awards and merit scholarships come off it, and the resulting net price varies enormously between schools with similar sticker prices. Every US college is required to publish a net price calculator on its own site. Run it, then feed that net figure into your projection instead of the headline number. A private school listing $70,000 and a state school listing $30,000 can end up closer than they look.

Using the college cost calculator

Six inputs: current annual cost, years until enrollment, expected cost inflation, current savings, monthly contribution and expected investment return. The cost figure comes off the school's cost of attendance page, which bundles tuition, fees, housing, food and an allowance for books. Current savings is the balance on your latest 529 or brokerage statement.

What return should you assume?

For money that will not be spent for more than ten years, something around 6% a year for a mixed portfolio is a reasonable planning figure. Inside five years of enrollment, drop it to 3% or 4%, because age-based 529 portfolios automatically shift toward bonds and cash as the date approaches. Using 6% right up to freshman year overstates the ending balance and hides the gap.

Closing the gap

Saving $400 a month for fourteen years at 6% builds about $105,000. Against a $239,000 projection that covers roughly 44%. Seeing that number is uncomfortable, but it is more useful than not knowing, and it points at the three levers you actually have: save more each month, start earlier, or aim at cheaper schools.

A common way to frame the rest is thirds. Roughly a third from savings built beforehand, a third from income and work during the college years, and a third from borrowing. Whether that split suits you depends on how much debt you are willing to see your child carry. Before assuming loans fill the gap, read our student loan repayment guide so the monthly payment on that final third is a real number rather than a vague one. Merit aid is the fourth lever, and it usually tracks grades and test scores, so our note on what GPA colleges look for is worth a look while there is still time to influence it.

Common questions

Should I include room and board? Yes, if your child will live on campus. If housing and food are $12,000 of a $28,000 cost of attendance, leaving them out drops the projection from $239,000 to about $137,000, which is a $100,000 planning error. Take the total straight off the school's cost of attendance page.

Is 5% the right inflation rate to use? It is a common planning default rather than a fact. Public in-state costs and private costs have moved at different speeds. Run 3%, 5% and 6% and plan somewhere between the middle and the high case.

Does saving in a 529 hurt financial aid? Much less than people fear. A parent-owned 529 is treated as a parental asset, which is assessed at a far lower rate than money held in the student's own name.

What if my child does not go, or gets a full scholarship? You can change the beneficiary to another family member, or withdraw an amount matching the scholarship without the 10% penalty, though earnings in that withdrawal are still taxed as income.