🎓 College Savings Calculator: Project Your 529 and Spot the Gap
By Shihab Mia · Updated 2026-07-01
This calculator gives an estimate only. Real outcomes depend on your actual investment returns (which vary and can be negative), the fees inside a 529 or other account, future tuition inflation, financial aid, scholarships, and tax rules where you live. It is not investment, tax, or financial advice. Confirm figures with your plan documents and a qualified adviser before making decisions.
A college savings calculator shows whether your current balance plus your monthly contributions will grow enough to cover college by the time your child enrolls, after adjusting for rising costs. Enter your current savings, monthly contribution, years until college, an expected return, and a college cost estimate. You instantly see your projected savings, the inflated cost, and whether you have a surplus or a shortfall, plus the extra monthly amount needed to close any gap.
What is the College Savings Calculator?
Saving for college is a two-sided race: your money compounds on one side while the price of college climbs on the other. This tool models both. On the savings side, it grows your starting balance and each monthly contribution at the expected annual return you enter. On the cost side, it inflates today's estimated college cost by an annual rate, because published tuition has historically risen faster than general consumer prices. The headline result is the gap between the two. A surplus means you are projected to have more than enough, and a shortfall is the amount you are projected to fall short by, expressed both as a lump sum and as the additional monthly saving needed to erase it.
The growth of your contributions follows the future value of an annuity. Each monthly deposit compounds for the months remaining until college, so early deposits are worth far more at the finish line than late ones. That is why starting early matters so much: a dollar saved the year your child is born has roughly eighteen years to compound, while a dollar saved in senior year of high school has almost none. The same logic explains why a modest amount started early can beat a much larger amount started late, and why waiting even three or four years can force you to raise your monthly contribution sharply to hit the same target.
Most families use a 529 plan, a tax-advantaged account built for education. Inside a 529, investments grow tax-deferred and qualified withdrawals for tuition, fees, books, and certain room and board are free of federal tax, and often state tax too. Many states also give a state income tax deduction or credit for your contributions, though the amount and rules vary widely by state. Under the 2025 One Big Beautiful Bill Act, from tax year 2026 the annual 529 limit for K-12 expenses doubled to $20,000 per beneficiary and the list of qualified expenses widened to include items like tutoring, standardized test fees, and certain therapies. This calculator stays plan-agnostic, so it works for a 529, a custodial account, or an ordinary brokerage or savings account. Just set the expected return to match the account and investment mix you actually hold.
A 529 has a small effect on need-based aid, and it is usually smaller than families fear. A parent-owned or dependent-student-owned 529 is reported as a parent asset on the FAFSA and assessed at most 5.64 percent of its value, so a $10,000 balance reduces the Student Aid Index by up to $564, not the whole balance. Qualified withdrawals are never counted as student income, no matter who owns the account. Grandparent-owned 529 plans no longer count against aid on the current FAFSA, which is why some families use them deliberately. The takeaway: the aid hit from saving is minor compared with the cost of not saving at all.
Because real returns are never smooth and tuition can move differently than expected, treat every projection as a planning guide, not a promise. Run the calculator with more than one return and inflation assumption to see how sensitive your plan is, then revisit the numbers once a year and adjust your contribution as your balance, the real cost, and your time horizon change. As college nears, many savers gradually shift to safer holdings, which lowers the return you should reasonably assume in the final years.
When to use it
- Checking whether your current savings rate will cover a child's projected college cost.
- Seeing how much extra you need to save each month to close a projected shortfall.
- Comparing the impact of starting now versus waiting a few years to begin saving.
- Stress-testing a plan against higher tuition inflation or a lower expected return.
- Setting a realistic monthly 529 or education-account contribution toward a target.
- Deciding how much of the total cost to aim for after expected aid and scholarships.
How to use the College Savings Calculator
- Enter your current college savings balance.
- Enter the amount you plan to contribute each month.
- Enter the number of years until college starts.
- Enter an expected annual return for your investments.
- Enter today's estimated total college cost and an annual cost-inflation rate.
- Read off the projected savings, projected cost, and your surplus or shortfall.
- If short, note the extra monthly amount suggested and adjust your plan.
Formula & method
Worked examples
You have $10,000 saved, add $300 a month for 10 years at a 6% expected return, and college is estimated at $120,000 today with 5% annual cost inflation.
- Monthly return i = 6 / 12 / 100 = 0.005, months n = 10 x 12 = 120
- Growth factor (1 + i)^n = 1.005^120 = 1.819397
- Current savings grow: 10,000 x 1.819397 = 18,193.97
- Contributions grow: 300 x (1.819397 - 1) / 0.005 = 300 x 163.8793 = 49,163.80
- Projected savings = 18,193.97 + 49,163.80 = 67,357.77
- Projected cost = 120,000 x 1.05^10 = 120,000 x 1.628895 = 195,467.36
- Gap = 67,357.77 - 195,467.36 = -128,109.58 (shortfall)
Result: Projected savings approx $67,358, projected cost approx $195,467, shortfall approx $128,110
You have $20,000 saved, add $500 a month for 18 years at a 6% expected return, and college is estimated at $80,000 today with 4% annual cost inflation.
- Monthly return i = 0.005, months n = 18 x 12 = 216
- Growth factor 1.005^216 = 2.936766
- Current savings grow: 20,000 x 2.936766 = 58,735.32
- Contributions grow: 500 x (2.936766 - 1) / 0.005 = 500 x 387.3532 = 193,676.60
- Projected savings = 58,735.32 + 193,676.60 = 252,411.92
- Projected cost = 80,000 x 1.04^18 = 80,000 x 2.025817 = 162,065.32
- Gap = 252,411.92 - 162,065.32 = 90,346.60 (surplus)
Result: Projected savings approx $252,412, projected cost approx $162,065, surplus approx $90,347
Closing a gap: you are projected to fall $50,000 short with 12 years to go at a 6% return, and you want to know the extra monthly saving needed.
- Monthly return i = 0.005, months n = 12 x 12 = 144
- Growth factor 1.005^144 = 2.043928
- Annuity factor = (2.043928 - 1) / 0.005 = 208.7855
- Extra monthly = target gap / annuity factor = 50,000 / 208.7855 = 239.48
- So about $240 a month more, invested for 12 years at 6%, grows to roughly $50,000
Result: About $240 extra per month closes a $50,000 gap over 12 years at a 6% return
Projected balance from monthly contributions alone (no starting balance), 18 years at a 6% return
| Monthly contribution | Total contributed | Projected balance | Growth |
|---|---|---|---|
| $100 | $21,600 | $38,735 | $17,135 |
| $200 | $43,200 | $77,471 | $34,271 |
| $300 | $64,800 | $116,206 | $51,406 |
| $500 | $108,000 | $193,677 | $85,677 |
How cost inflation grows a $100,000 college cost over time
| Years to college | At 3% inflation | At 5% inflation | At 7% inflation |
|---|---|---|---|
| 5 years | $115,927 | $127,628 | $140,255 |
| 10 years | $134,392 | $162,889 | $196,715 |
| 15 years | $155,797 | $207,893 | $275,903 |
| 18 years | $170,243 | $240,662 | $337,993 |
Monthly saving needed per $100,000 goal, by years remaining, at a 6% return
| Years to college | Monthly saving needed | Total you contribute |
|---|---|---|
| 5 years | $1,433 | $85,980 |
| 10 years | $610 | $73,200 |
| 15 years | $344 | $61,920 |
| 18 years | $258 | $55,728 |
Common mistakes to avoid
- Forgetting that college costs keep rising. Planning against today's sticker price understates the target badly. Tuition has historically risen faster than general inflation, so a cost that looks fully funded now can be well short by the time your child enrolls. Always project the cost forward with an inflation rate.
- Assuming a smooth, high return. Markets do not return a steady 8% every year, they swing, and a poor stretch right before college can hurt. Use a moderate expected return, and consider shifting to safer holdings as college approaches, which usually lowers the return you should assume.
- Starting late and trying to catch up. Because contributions compound, money saved early is worth far more at college start than money saved near the end. Waiting a few years to begin can force a much larger monthly contribution to reach the same target.
- Aiming to fund 100% of the sticker price. Financial aid, scholarships, tax breaks, and current income at the time can cover part of the bill. Many families target a realistic share of the cost rather than the full inflated figure, which keeps the monthly contribution achievable.
- Overestimating the financial aid hit from saving. A parent-owned 529 is assessed at most 5.64 percent of its value on the FAFSA, so $10,000 saved reduces aid eligibility by up to $564, not the whole balance. Fear of losing aid is a poor reason to skip saving.
- Ignoring your state 529 tax break. Many states offer a deduction or credit for 529 contributions, which raises your effective return. Contributing to an out-of-state plan can forfeit that benefit, so check your own state rules before choosing a plan.
Glossary
- 529 plan
- A tax-advantaged investment account for education, where growth is tax-deferred and qualified withdrawals for education are tax-free at the federal level and often the state level.
- Future value
- What a sum or a stream of contributions is projected to be worth at a later date after compound growth.
- Annuity (savings)
- A series of equal payments made at regular intervals, such as a fixed monthly contribution. Its future value is the sum of each payment grown to the end date.
- Expected return
- The average annual growth rate you assume your investments will earn. Real returns vary year to year and can be negative.
- Cost inflation
- The annual rate at which college costs rise. Education inflation has often run higher than general consumer inflation.
- Shortfall
- The amount by which your projected savings fall below the projected cost. A surplus is the opposite, a projected excess.
- FAFSA
- The Free Application for Federal Student Aid, the form used to determine eligibility for need-based financial aid.
- Student Aid Index (SAI)
- A figure calculated from FAFSA data that colleges use to gauge how much a family can contribute. Parent assets, including most 529s, are assessed at up to 5.64 percent.
Frequently asked questions
How much should I save for college each month?
It depends on your target cost, years until college, and expected return. Enter those in the calculator and it shows whether your current contribution is on track, plus the extra monthly amount needed to close any shortfall. As a rough guide, at a 6% return you need about $258 a month for 18 years, or $610 a month for 10 years, to reach a $100,000 goal.
What return should I assume?
Use a return that matches how you actually invest. A stock-heavy mix has historically averaged higher long-run returns but with big swings, while a conservative mix returns less. Many planners use something in the 4% to 7% range and lower it as college nears. Returns are never guaranteed, so a moderate, realistic figure is safer for planning.
Does this calculator assume a 529 plan?
No, it is plan-agnostic. It works for a 529, a custodial account, or a regular brokerage or savings account. A 529 adds tax advantages that can improve your real after-tax return, so if you use one you might justify a slightly higher net return, but the math here is the same.
What college cost inflation rate should I use?
College costs have historically risen faster than general inflation, often in the 3% to 6% range per year depending on the institution and period. A higher rate gives a more cautious, larger target. If unsure, try a few rates to see how sensitive your plan is to rising costs.
Should I plan to cover the full cost of college?
Not necessarily. Financial aid, scholarships, tax credits, student contributions, and income at the time can all cover part of the bill. Many families set a target of funding a realistic share, such as half or two-thirds, which keeps the monthly contribution manageable while still building a strong fund.
How does a 529 plan affect financial aid?
A parent-owned or dependent-student-owned 529 is reported as a parent asset on the FAFSA and assessed at most 5.64 percent of its value, so a $10,000 balance reduces the Student Aid Index by up to $564. Qualified withdrawals are never counted as student income, and grandparent-owned 529 plans no longer count against aid on the current FAFSA.
Is there a contribution limit on a 529 plan?
There is no federal annual limit, but contributions above the yearly gift-tax exclusion (which is per giver, per beneficiary) may require a gift-tax return. Each state also sets an aggregate lifetime cap per beneficiary, commonly ranging from about $235,000 to $550,000. From 2026, the annual 529 limit for K-12 expenses is $20,000 per beneficiary.
Are 529 contributions tax deductible?
Not at the federal level. Many states, though, offer a state income tax deduction or credit for contributions to their own 529 plan, and the amount and rules vary widely. Check your state plan documents, since contributing to an out-of-state plan may forfeit the break.
What happens to leftover 529 money if my child does not use it?
You can change the beneficiary to another family member, use funds for graduate school or eligible trade programs, or withdraw the money (earnings are taxed and usually face a 10% penalty). Under recent rules, limited amounts of unused 529 funds can also be rolled into a Roth IRA for the beneficiary, subject to conditions.
How accurate is this projection?
It is a planning estimate, not a guarantee. It assumes a steady return and steady cost inflation, but real returns swing year to year and costs can move differently than expected. Revisit the numbers yearly and adjust your contribution as balances, costs, and your return assumptions change.
Sources
- An Introduction to 529 Plans , U.S. Securities and Exchange Commission
- 529 Plans: Questions and Answers , Internal Revenue Service