ConverterHub

College Savings Calculator

See how a 529-style fund grows by college.

How it is calculated

The tool uses the future value of a series of equal monthly deposits: FV = M × ((1 + i)n − 1) / i, where M is the monthly contribution, i = annual_return / 100 / 12 is the monthly rate and n = years × 12 is the number of deposits. With a 0% return the fund is just M × n. Total contributions are M × n and growth is the final value minus contributions. The formula assumes the deposit is made at the end of each month, that there is no starting balance, and that the return is a constant rate. It ignores fees, taxes and the rising cost of tuition, so treat the result as a projection in today's money terms of nominal dollars, not a guarantee.

Worked example

Save $300 a month for 18 years at an assumed 6% annual return. Monthly rate: 6 / 100 / 12 = 0.005. Number of deposits: 18 × 12 = 216. Growth factor: 1.005216 ≈ 2.9368. Fund: 300 × (2.9368 − 1) / 0.005 = $116,205.96. You paid in 300 × 216 = $64,800.00, so the investment growth is $51,405.96.

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Common mistakes

  • Entering the yearly contribution in the monthly field; the field expects the amount per month, so $3,600 a year is 300.
  • Using an optimistic return, such as a past peak, instead of a cautious long-run figure; the result moves a lot with the rate.
  • Expecting an existing balance to be counted: there is no starting-balance field, so add its grown value separately.
  • Comparing the final value with today's tuition: college costs will probably be higher by enrollment, so the target should be inflated too.
  • Typing the return as 0.06 instead of 6.

Sources

About this calculator

A college savings projection models how regular monthly contributions grow into a future college fund by compounding at an assumed investment return over the years until enrollment — the same future-value-of-an-annuity math behind 529 plans in the U.S. and similar tax-advantaged education savings accounts elsewhere. Each month's contribution earns returns for a different length of time, so contributions made early in the savings horizon compound for much longer than contributions made closer to college age.

Parents and grandparents use this projection to work backward from a college cost target — figuring out how much to contribute monthly to hit a goal by a child's 18th birthday — or forward from a fixed monthly amount to see what fund size it's likely to produce, factoring in that college costs themselves tend to rise over time.

A monthly contribution, the return you expect and the years until college give the projected size of the education fund.

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