Saving for college is one of the biggest financial goals a family takes on, and the number that makes it feel real is the monthly deposit. This college savings calculator estimates exactly how much you need to put aside each month — usually into a 529 plan — to cover future tuition, room, and board after accounting for college cost inflation and the investment return your savings can earn.
Adjust the sliders and every figure updates instantly. You can model a newborn, a kindergartner, or a high-school freshman, stress-test a lower return, and see how much of the target comes from compound growth versus out-of-pocket contributions.
How to Use
- Enter your Child's Current Age — how old they are today. The younger they are, the more time compounding has to work.
- Set the College Start Age. Eighteen is the default; adjust it up if your child might take a gap year or start later, or down if they plan to graduate high school early.
- Type the Current Annual College Cost. Use today's sticker price for one year of tuition, fees, room, and board at the kind of school you are targeting — public in-state, public out-of-state, or private. If you do not know, $30,000 is a reasonable national average.
- Choose the College Cost Inflation rate. Tuition has historically risen about 4–6% per year; 5% is the default. If you expect your child to qualify for large scholarships, you can lower this.
- Set the Expected Annual Return. A balanced age-based 529 portfolio typically targets 6–8% in the early years, gliding toward bonds as enrollment approaches. Test a range of ±2% to stress-test your plan.
- Add any Existing College Savings already sitting in a 529, UTMA, Coverdell ESA, or brokerage earmarked for school.
- Pick the Years of College — 4 for a bachelor's degree, 2 for a community college transfer path, or 5 for an engineering or architecture program.
The result card shows the inflated annual cost at enrollment, the total funding needed (the present value of all four years of tuition at enrollment day), the future value of your existing savings, and the required monthly contribution — the highlighted number you should actually wire into your 529 auto-debit.
The Math Behind the Number
College savings planning uses two standard finance formulas stacked together.
First, today's tuition is inflated to the enrollment year. If annual cost today is $30,000 and tuition rises 5% per year, the freshman-year bill in 13 years is $30,000 × 1.05¹³ ≈ $56,569.
Second, each of the four (or however many) college years still costs a little more than the one before, but the unspent balance keeps earning your investment return. We discount each future year's cost back to enrollment day at the expected return, then sum them. That gives the target balance you need on day one of freshman year.
Third, we solve the ordinary annuity payment. If r is the monthly return and n is the number of months until enrollment:
PMT = TargetFV × r / ((1 + r)ⁿ − 1)
This is the same future-value-of-an-annuity formula used by every major brokerage, and it is the inverse of the mortgage payment formula. With 13 years to save, a 7% annual return, and a target of roughly $220,000, the required monthly deposit is about $868.
If the expected return is set to 0%, the formula divides by zero, so the engine simply splits the target evenly across the months: about $1,563 per month.
Why Start Early?
The power of compounding is the whole reason the age input matters. Holding the school constant at $30,000 today, 5% tuition inflation, and 7% investment returns:
- Start at age 5 (13 years to save): target about $220,012, required deposit $868 per month, total contributions ~$135,000, and compound growth supplies the remaining ~$85,000.
- Start at age 10 (8 years to save): target about $172,385, required deposit $1,345 per month, total contributions ~$129,000.
- Start at age 15 (3 years to save): target about $135,068, required deposit $3,383 per month, total contributions ~$122,000 — almost no growth to lean on.
Waiting five years roughly 1.5x's the monthly bill, and going from age 5 to age 15 nearly 4x's it. That is why financial planners push families to open a 529 at birth even if they can only afford $50 a month to start.
Examples
Example 1 — The default family. A child is 5, current annual cost is $30,000, college inflation 5%, expected return 7%, no existing savings, four years of college. Years to save: 13. Inflated freshman-year cost: about $56,569. Total funding needed at enrollment: about $220,012. Required monthly contribution: $868. Total out-of-pocket contributions over 13 years: about $135,483; the remaining ~$84,500 comes from investment growth.
Example 2 — A newborn with a head start. At age 0, 18 years to save, same school at $30,000 per year today, 5% tuition inflation, 7% return. The freshman-year bill inflates to about $72,199 and the total funding needed at enrollment is roughly $280,798. The required monthly contribution is about $652 — under three-quarters of the age-5 number. Grandparents opening a 529 at birth can fund a large share of a degree with very small monthly deposits.
Example 3 — A high-schooler with $100,000 already saved. A 15-year-old has three years to save and $100,000 already in a 529. That $100,000 grows to about $123,293 by age 18 at 7%, covering nearly all of the roughly $135,068 target. The remaining gap needs only around $295 per month — a fraction of the $3,383 monthly bill a family with no prior savings faces.
Example 4 — A large family target. A family targeting a $70,000-per-year private school today (inflating to roughly $132,000 per year in 13 years) needs about $513,362 at enrollment. At 7% return, the monthly contribution climbs to roughly $2,026. Running this number before applying prevents sticker shock on graduation day.
FAQ
How much should I save each month for college?
For a typical $30,000-per-year school today with a kindergartner and 7% investment returns, plan on about $868 per month. Exact numbers depend on your child's age, the school's current price, college-cost inflation, and how much you have already saved — use the sliders above for your own figure.
Is a 529 plan the best way to save?
A 529 plan is the most tax-efficient college savings vehicle in the United States: contributions grow tax-free, withdrawals for qualified education expenses are federal-tax-free, and many states offer an upfront deduction. Coverdell ESAs and UTMA accounts are alternatives, but 529s have no income limits and much higher contribution caps.
What is a realistic college cost inflation rate?
College tuition has historically risen about 4–6% per year, roughly 1–2 points above general CPI. Five percent is a neutral default. Use 4% if you expect your child to qualify for need-based aid, and 6% if you are targeting elite private schools that have raised prices faster than average.
What is a realistic investment return for a 529?
Age-based 529 portfolios typically target 7–9% equities-heavy returns when a child is young, gliding down to 4–5% in bonds and cash as enrollment approaches. A long-run expected return of 6–7% is reasonable for the full saving period, but sequence-of-returns risk in the final years is real — that is why most plans de-risk automatically.
Do I need to save the full sticker price?
No. Most families pay less than sticker through grants, scholarships, tax credits, and work-study. The calculator assumes you cover 100% of cost; if you expect $10,000–$20,000 per year in aid, subtract that from your target or reduce the current annual cost input accordingly.
What if I start saving late?
Starting late does not doom the plan, but it raises the monthly bill sharply. On a $30,000-per-year school at 7%, starting at age 15 instead of age 5 raises the required monthly contribution from about $868 to roughly $3,383. Consider stretching college over five years, starting at a community college, or using student loans strategically to smooth the cash flow.
Can grandparents contribute to a 529?
Yes. Anyone can contribute to a 529 plan, and 2025 federal gift-tax exclusion allows up to $19,000 per donor per year (or five years front-loaded at $95,000 without gift tax). Grandparent-owned 529s were historically treated unfavorably on FAFSA, but the 2024–2025 FAFSA simplification largely removed that penalty.
Disclaimer
This college savings calculator is provided for informational purposes only and does not constitute financial, tax, or investment advice. Estimates are based on the inputs you enter and standard annuity math; actual college costs, investment returns, financial aid awards, and 529 plan rules vary by school, state, market, and year. Always confirm your plan with a qualified financial advisor and verify current 529 contribution limits, tax treatment, and qualified-expense rules with a tax professional.