529 College Savings Calculator
Plan for education costs with a 529 college savings calculator. Enter your child's age, target college costs, monthly contributions, and expected returns to see if you're on track. Compare projected savings against estimated tuition costs with inflation.
A 529 plan is a state-sponsored, federally tax-advantaged investment account designed specifically for education expenses. Contributions are made with after-tax dollars (no federal deduction, though most states offer a state-level deduction or credit for residents who use the in-state plan), but the investments grow tax-free, and qualified withdrawals — for tuition, fees, books, computers, room and board, and certain K-12 expenses up to $10,000 per year — are entirely tax-free at both federal and state levels.
The math problem 529 plans solve is brutal: college costs have inflated at roughly 4–5% annually for decades, well above general inflation. A four-year private college that costs $300,000 today may cost $480,000 by the time a current 5-year-old enrolls. Even in-state public universities can run $115,000–$140,000 for a full degree. Funding this from cash flow during the college years is essentially impossible for most families; the only viable path is to start saving early and let compounding do the heavy lifting.
This calculator compares your projected 529 balance at college start age (based on your current balance, monthly contributions, and expected return) against the projected cost of college (current annual tuition inflated forward by your chosen tuition inflation rate, times years of college). The output shows how much of the cost you're on track to cover and what gap, if any, remains. Treat the cost projection as a stress test — small differences in tuition inflation produce large differences in the final number.
Inputs
Current cost per year
Results
Projected Savings
$80,680
Projected Tuition Cost
$203,185
Surplus / Shortfall
$-122,505
Shortfall
Total Growth
$28,880
Savings Growth Over Time
Contributions vs Growth
Year-by-Year Breakdown
| Year | Age | Contributions | Growth | Balance |
|---|---|---|---|---|
| 1 | 6 | $3,600.00 | $408.00 | $9,008.00 |
| 2 | 7 | $3,600.00 | $648.48 | $13,256.48 |
| 3 | 8 | $3,600.00 | $903.39 | $17,759.87 |
| 4 | 9 | $3,600.00 | $1,173.59 | $22,533.46 |
| 5 | 10 | $3,600.00 | $1,460.01 | $27,593.47 |
| 6 | 11 | $3,600.00 | $1,763.61 | $32,957.08 |
| 7 | 12 | $3,600.00 | $2,085.42 | $38,642.50 |
| 8 | 13 | $3,600.00 | $2,426.55 | $44,669.05 |
| 9 | 14 | $3,600.00 | $2,788.14 | $51,057.19 |
| 10 | 15 | $3,600.00 | $3,171.43 | $57,828.63 |
| 11 | 16 | $3,600.00 | $3,577.72 | $65,006.34 |
| 12 | 17 | $3,600.00 | $4,008.38 | $72,614.72 |
Formula
How to use this calculator
- Enter the child's current age and the age you expect them to start college. The time horizon dominates the final balance — every year matters.
- Enter the current 529 balance if you already have an account. Start with $0 if you haven't opened one yet.
- Enter the monthly contribution you can sustain. The 2024 annual gift-tax exclusion allows up to $18,000 per parent per child without filing a gift tax return ($36,000 for a couple). 529s also allow front-loading 5 years of contributions in a single year.
- Enter an expected annual return. 6–7% is a defensible long-term assumption for an age-based portfolio that becomes more conservative as the child approaches college. 5% is more conservative.
- Enter the current annual tuition for the target college (or college type). Average public in-state with room and board: ~$30K. Average private with R&B: ~$60K. Elite private: $80–95K. Use realistic local numbers.
- Enter years of college. Four years is standard for an undergraduate degree; some plans cover graduate school too if there's leftover money.
- Set tuition inflation. Historical college inflation runs 4–5% annually — higher than general CPI. For conservative planning, use 5%; for aggressive, 6–7%.
- Review the projected balance vs. projected cost. If you're short, run the calculator again with higher contributions to see how much more you'd need each month to close the gap.
Worked examples
Newborn, in-state public target
Child age 0, $0 starting balance, $400/mo contribution, 7% return, $28,000 current annual tuition, 5% tuition inflation, 4 years of college. n = 18 years Projected balance at age 18: $400 × 12 × [(1.07^18 − 1)/0.07] ≈ $173,000 Projected 4-year cost: $28,000 × (1.05^18) × 4 + interpolation ≈ $290,000 Coverage: ≈ 60%. The remaining $115,000 gap can be filled by parental cash flow during college, student loans, or scholarship/grants. Increasing the contribution to $600/mo: balance ≈ $260,000, coverage ≈ 90%.
Started late — child is 10
Child age 10, $15,000 starting balance, $500/mo contribution, 6% return, $40,000 current annual tuition (private mid-tier), 5% tuition inflation, 4 years. n = 8 years Projected balance at age 18: 15,000 × 1.06^8 + 500 × 12 × [(1.06^8 − 1)/0.06] ≈ 23,900 + 60,000 ≈ $84,000 Projected 4-year cost: ≈ $215,000 Coverage: ≈ 39%. Starting late dramatically limits the achievable balance. Increasing monthly to $1,000 only raises balance to ~$140,000 (still 65% coverage). Time, not contribution rate, is the dominant variable.
Aggressive savers, elite-college target
Child age 3, $25,000 starting balance, $1,000/mo contribution, 7% return, $80,000 current annual tuition (elite private), 5% tuition inflation, 4 years. n = 15 years Projected balance: 25,000 × 1.07^15 + 1,000 × 12 × [(1.07^15 − 1)/0.07] ≈ 68,950 + 301,500 ≈ $370,500 Projected 4-year cost: $80,000 × (1.05^15) × 4 (plus tuition inflation across years) ≈ $740,000 Coverage: ≈ 50%. Even with aggressive saving, fully funding an elite private college from a 529 alone is extremely difficult. The remainder usually comes from parental cash flow during college, merit/need-based aid, and family contributions outside the 529.
When to use this calculator
Use this calculator any time after a child is born — or earlier, if you're a future parent planning ahead — to set or revisit a 529 contribution rate. The earlier you start, the more compounding does for you. Starting at birth with $300/mo at 7% produces about $134,000 by college age. Starting at age 10 with the same $300/mo produces only about $52,000.
It is also useful to revisit annually. As the child grows older, the appropriate asset allocation usually shifts more conservative (most 529 age-based portfolios automate this), which means the assumed return should also moderate over time. Re-running the calculator each year with updated balances and a current realistic return helps catch drift early.
Pair this with the savings-goal calculator (general-purpose goal funding), the compound-interest calculator (to model what an increased contribution would do), and the cost-of-living calculator (because the "right" college cost depends heavily on geography).
A few key 529 facts worth knowing: (1) most states offer a state income tax deduction for 529 contributions to the in-state plan, often $5,000–$10,000 per child per year. (2) SECURE 2.0 (2024+) allows rolling up to $35,000 lifetime of unused 529 funds into a Roth IRA for the beneficiary, subject to conditions. (3) Parent-owned 529s count as parental assets on FAFSA, assessed at a maximum of 5.64% per year — much better treatment than student-owned savings. (4) Funds can be transferred to another family member if the original beneficiary doesn't need the money.
Common mistakes to avoid
- Waiting "until we can afford more." Starting with $50/mo at birth beats starting with $500/mo at age 10. Compounding rewards time more than contribution rate. Even modest amounts started early are powerful.
- Using the in-state plan blindly without checking out-of-state options. Most states' plans are reasonably priced, but a few have very high expense ratios. If your state has no tax deduction for 529 contributions, check whether a low-cost plan (Utah, NV, NY, IL all popular) is a better fit.
- Underestimating tuition inflation. College inflation has consistently outpaced general inflation. Using 3% (CPI rate) instead of 5% (education-specific rate) understates the future cost by 25–35%.
- Over-funding for elite private college costs that may not be needed. Many talented students attend state schools at much lower cost; many receive significant merit/need-based aid. Funding for the most expensive scenario can mean leaving money in the 529 with a 10% penalty on earnings for non-qualified withdrawal.
- Not coordinating with grandparents. Grandparent-owned 529s have evolved under FAFSA simplification — they no longer harm financial aid eligibility (after the 2024-25 FAFSA changes). This makes grandparent 529 contributions much more attractive than they used to be.
- Ignoring the SECURE 2.0 Roth rollover backstop. Up to $35,000 of unused 529 funds can be rolled into a Roth IRA for the beneficiary (subject to a 15-year account age and other limits). This reduces the over-funding risk meaningfully — leftover money has a path other than a 10% penalty.
Frequently Asked Questions
Sources & further reading
- An Introduction to 529 Plans — U.S. Securities and Exchange Commission
- Publication 970 — Tax Benefits for Education — U.S. Internal Revenue Service
- Federal Student Aid — paying for college — U.S. Department of Education