529 Education Savings Calculator
Projects how much a 529 college savings plan will grow given monthly contributions, an initial deposit, and an expected return rate. Use it when planning how much to save before your child starts college.
Last updated: September 2026
Formula below · 2 sources (ed.gov, Wikipedia) · Updated Sep 2026
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About this calculator
A 529 plan grows through compound interest, and this calculator uses monthly compounding to project the future value of your account. The core formula combines two components: the future value of the initial lump-sum deposit and the future value of ongoing monthly contributions. Specifically: FV = initialDeposit × (1 + r/12)^(n) + monthlyContribution × [(1 + r/12)^(n) − 1] / (r/12), where r is the annual return rate as a decimal and n = yearsToSave × 12 is the total number of months. State income tax deductions on contributions lower your tax bill but are not deposited into the account, so they are not added to the plan value; at your state rate they are worth roughly contributions × rate per year where a deduction is offered (limits vary by state, and some states offer none). The longer the savings horizon, the more dramatically compounding works in your favor.
How to use
Suppose you open a 529 with a $2,000 initial deposit, contribute $200/month, expect a 6% annual return, and plan to save for 10 years. First compute r/12 = 0.06/12 = 0.005 and n = 120. Initial deposit grows to: 2000 × (1.005)^120 ≈ 2000 × 1.8194 = $3,638.79. Monthly contributions grow to: 200 × (1.8194 − 1) / 0.005 = 200 × 163.88 = $32,775.87. Sum ≈ $36,414.66. In a 6% state that allows a full deduction, the $2,400 you contribute each year also saves about $144 a year in state tax, outside the account.
Frequently asked questions
How much should I contribute monthly to a 529 plan to cover college costs?
The right monthly contribution depends on your target college fund amount, years until enrollment, and expected investment return. Use this calculator by working backward: try different monthly contribution amounts until the projected balance meets your goal. As a rough benchmark, saving $200–$500 per month starting at birth can accumulate $50,000–$150,000 by age 18 at moderate returns. Starting early is the single most powerful factor due to compound growth.
What are the tax benefits of a 529 education savings plan?
529 plans offer two main tax advantages: investment earnings grow tax-free at the federal level, and qualified withdrawals for education expenses are not taxed. Many states also allow a deduction or credit on contributions, effectively reducing your state income tax bill each year. This calculator shows the account value only; the state tax saving (roughly your contributions × your state rate, within your state's limit) comes back to you on your tax return. The exact deduction limits and eligible expenses vary by state, so checking your state's 529 program details is recommended.
When should I start saving in a 529 plan for my child's college education?
The earlier you start, the better, because compound interest has more time to work. Opening a 529 at birth gives you roughly 18 years of growth, which can more than double or triple contributions at typical market returns. Even starting when a child is 10 years old still provides meaningful growth over 8 years. Delaying by even a few years significantly increases the monthly amount you'd need to contribute to reach the same target balance.