529 Calculator

Written by Great Medico

Updated September 25, 2026 •3 min read

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When a decision has several moving parts, a transparent estimate is more helpful than a single unexplained number. 529 Calculator projects how a tax-advantaged savings balance may grow from the current balance, contributions, return assumptions, and time horizon entered.

What this calculator does

529 Calculator projects how a tax-advantaged savings balance may grow from the current balance, contributions, return assumptions, and time horizon entered. The form asks for current 529 balance, monthly contribution, expected annual return, years until college, current annual college cost, years of college to fund, and annual education cost inflation. The result should therefore be read as a calculation from those displayed assumptions, not as live market, lender, tax, or government-program data unless the page explicitly supplies such a feed.

How to use it

Enter Current 529 balance, Monthly contribution, Expected annual return, Years until college, Current annual college cost, Years of college to fund, and Annual education cost inflation. Keep monetary inputs in one currency; the currency selector formats results and does not convert exchange rates. Enter rates and percentages on the scale shown by the field label; do not silently switch between a decimal and a percent. Keep time values in the period shown on the form so a monthly figure is not accidentally entered as an annual one or vice versa. Before calculating, recheck Current 529 balance, Monthly contribution, Expected annual return against the source values you intend to model. If a default value is already filled in, confirm that it matches the scenario you actually want to test rather than assuming the preset is current or personally appropriate.

How the calculation works

The projection compounds the starting balance and recurring contributions over the entered years using the expected return. For 403(b), the monthly contribution is built from the employee contribution plus an employer match limited by the entered match cap. For 529, monthly deposits grow alongside the current balance and are compared with an inflation-adjusted college-cost estimate. This is the calculation method to use when checking the result from 529 Calculator; values not represented by a visible input should not be inferred as part of the model.

Example

With $5,000 already saved, a $250 monthly contribution, 6% expected return, 12 years, $25,000 current annual college cost, four college years, and 5% cost inflation, the calculator grows the account and separately inflates the four-year cost estimate to compare projected savings with a funding gap.

How to interpret the result

A larger future value can come from more time, higher contributions, or a higher assumed return. The result is a projection, so it is more useful for comparing scenarios than for predicting the exact account balance on a future date. Use the output as a scenario description, not as a promise of approval, return, tax treatment, or future price.

Limitations and notes

529 tax benefits and qualified expenses depend on federal and state rules. The cost model applies one inflation-adjusted annual cost across the entered college years rather than modeling a different inflated cost for each school year, so use the funding gap as a planning estimate. The calculator is a planning aid; it does not replace individualized legal, tax, lending, investment, or religious advice.