529 Plan Calculator
Education savings growth projections
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529 Plan Calculator turns the numbers behind education savings growth projections into a result, step by step. Just enter Current Balance, Monthly Contribution and Annual Return (%); 529 Plan updates the result as you type. In 529 Plan the working sits beside the answer. Anyone comparing options in Finance can use 529 Plan to compare scenarios. No sign-up is needed for 529 Plan. The math runs on your device. Looking for 529 plan calculator education savings or free online 529 plan calculator? 529 Plan covers both. 529 Plan shows formula, assumptions and result together. 529 Plan answers the next Finance question you meet.
What the defaults give
$10,000 to start, $300 a month for ten years at 7% projects a balance of $72,325.
Of that, $46,000 is money you put in and $26,325 is growth. Contributions are the larger half for the first several years.
The formula
Future value = balance × (1 + r/12)^n + monthly × [((1 + r/12)^n − 1) ÷ (r/12)]
The first term compounds the opening balance monthly across n = months × 12 periods. The second is the future value of an annuity: each contribution gets its own compounding period, so early deposits do far more work than late ones. At 7% the monthly rate is 0.5833%, and 120 periods multiply the opening balance by 2.01.
Worked examples
$10,000 + $300/mo × 10y at 7% → $72,325
$5,000 start → $62,277
$20,000 start → $92,422
$150/mo → $46,211
$600/mo → $124,553
3.5% return → $57,339
7 years instead of 10 → $35,779
20 years → $197,577
Time is the strongest lever in this table. Extending from ten years to twenty roughly doubles the total while contributions only rise from $46,000 to $82,000, because the last decade is where compounding takes over from saving. Rate matters almost as much: halving the return removes $15,000 of growth over ten years, and doubling it adds $46,500.
What a 529 changes about the arithmetic
A 529 plan is a tax-advantaged account, so the 7% you enter should be the return after fees, not before. Qualified withdrawals are free of federal tax when spent on tuition, fees, books, equipment and, within limits, room and board. That is the advantage over a taxable account with the same return.
Two things the projection leaves out. Fees: a plan charging 0.6% a year instead of 0.1% cuts roughly $4,000 off a ten-year projection this size. And the tax treatment of non-qualified withdrawals, where earnings are taxed as income plus a 10% penalty.
Use the years field as the gap until the first tuition bill, not until graduation. Money that will be spent in year one should not be in the same allocation as money for year four.
One practical check: with an 18-year horizon and a 7% return, the contributions made in the first five years are worth roughly twice as much at the end as the same money contributed in the last five. Front-loading a 529 while the child is small is the cheapest version of this plan.
Frequently Asked Questions
How much will $300 a month grow to in ten years?
At 7% with a $10,000 starting balance it reaches $72,325, of which $26,325 is growth on $46,000 of contributions.
How much of the total is contributions?
$46,000 — the $10,000 opening balance plus 120 monthly payments of $300. Growth is the remaining $26,325.
What difference does the return rate make?
At 3.5% the same plan reaches $57,339; at 14% it reaches $118,852. Ten points of return move the answer by more than doubling the monthly deposit.
Should I use the after-fee return?
Yes. Fees come out of the balance every year, so entering the gross return overstates the projection. A 0.5% fee difference is worth roughly $3,000–4,000 over this horizon.
Does this include tax benefits?
No. The model compounds a balance at the rate you enter. Qualified 529 withdrawals avoid federal tax on growth, which is the plan’s advantage over a taxable account.
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