To cover roughly half of a four-year in-state public college bill, a typical benchmark is about $360 a month from birth in a 529 plan earning around 6% a year. Wait until your child turns 8 and that same half-the-bill target jumps to about $580 a month because you have fewer years for growth and tuition has kept climbing. The single biggest lever in college saving is not how much you earn or which fund you pick. It is how early you start. The fastest way to size your own number is the college savings calculator, and this guide shows the by-age benchmarks and the tuition-inflation math behind them.
College saving is unusual because the target moves while you chase it. Most goals sit still: a $30,000 car costs $30,000 whether you buy it this year or in three. College does the opposite. Tuition has historically risen around 5% a year, well above general consumer inflation, so the bill you are saving for grows faster than the prices on almost everything else in your budget. This guide gives you concrete monthly targets by your child's age, shows how the tuition-inflation overlay changes the math, and helps you judge how much of the total cost a realistic plan actually covers.
How much to save for college by your child's age
The amount to save each month depends on three things: how many years until college, the cost you are aiming to cover, and the return you assume on the money. The table below targets half of a four-year in-state public bill, a common and realistic benchmark that splits the cost between savings, future income, financial aid, and the student. It assumes an all-in cost (tuition, fees, room, and board) of about $27,000 a year in today's dollars, grown at 5% tuition inflation to the year each payment is due, and a 6% average annual return on the 529 starting from a $0 balance.
| Child's age now | Years until college | Full 4-year cost (future $) | Half-the-bill goal | Monthly to save at 6% |
|---|---|---|---|---|
| Newborn (0) | 18 | $280,066 | $140,033 | $362 |
| 4 | 14 | $230,411 | $115,206 | $439 |
| 8 | 10 | $189,560 | $94,780 | $578 |
| 12 | 6 | $155,951 | $77,976 | $902 |
Read down the last column and the cost of waiting is brutal: the monthly figure roughly two-and-a-half times higher for a 12-year-old than a newborn, for a smaller total goal. That is compounding running in reverse. With 18 years, growth does most of the heavy lifting; with 6 years, your own deposits have to. These figures are illustrative, not a national average, so plug your own target cost into the college savings calculator to get a number tied to the schools you have in mind.
Why the tuition-inflation overlay matters so much
The reason college targets are hard to hit is that tuition has historically grown faster than your savings can comfortably outpace, and faster than general inflation. Picture $10,000 set aside today for an 18-year horizon. The table shows where it lands at different return rates, next to how much a college bill grows over the same stretch at 5% tuition inflation.
| What happens to $10,000 over 18 years | Result |
|---|---|
| Saved at 4% a year | $20,258 |
| Saved at 5% a year | $24,066 |
| Saved at 6% a year | $28,543 |
| Saved at 7% a year | $33,799 |
| A college bill that rose 5% a year | multiplied by 2.41 |
A bill that starts at $24,000 a year becomes about $57,800 a year after 18 years at 5% inflation. Saving at 4% barely keeps pace with the tuition you are chasing; you need a return comfortably above 5% just to gain ground on the bill. This is why parking college money in a plain savings account rarely works for a young child, and why a growth-tilted 529 portfolio matters early on. To see how a single dollar multiplies at different rates and horizons, the compound interest calculator makes the curve obvious, and the inflation calculator shows the erosion side of the same coin.
How much of the bill will your plan actually cover?
A direct answer: a steady monthly 529 contribution from birth usually covers a meaningful slice of college, not the whole thing, and that is fine. The table below shows what different monthly amounts, invested from birth at 6% for 18 years, grow to, against a full four-year in-state public cost of about $280,000 in future dollars.
| Monthly contribution from birth | Balance at age 18 (6%) | Share of full 4-year bill |
|---|---|---|
| $200 | $77,471 | about 28% |
| $300 | $116,206 | about 41% |
| $500 | $193,677 | about 69% |
Notice that nearly all of those balances are growth, not deposits. At $300 a month for 18 years you contribute $64,800 of your own money, yet the account reaches roughly $116,000 because compounding adds over $51,000. The lesson is not to despair at the gap; it is to fund as much as you comfortably can, as early as you can, and treat the rest as a problem for future income, aid, scholarships, and the student. Trying to fully fund the most expensive scenario at the expense of your own retirement is a known mistake, because you can borrow for college but not for retirement.
Set your return assumption to your time horizon
The 6% used above is a deliberately moderate, real-world assumption for a diversified portfolio that shifts toward bonds as college nears. A 529 account for a newborn can hold a stock-heavy mix and reasonably assume a higher long-run return; a 529 for a 16-year-old should be mostly conservative, because there is no time to recover from a downturn right before the first tuition payment. That tapering of risk and expected return as the child ages is the logic behind age-based 529 portfolios, which automatically dial down stock exposure over time.
Be honest with your numbers. Assuming 8% on a fund you have parked in cash will overstate your progress every year. If you are unsure what return to use, it is safer to plan with a modest rate and be pleasantly surprised than to plan with an optimistic one and arrive short. For the broader picture of how growth investing compounds over decades, the investment calculator lets you stress-test different rates against the same monthly deposit.
A four-step plan to find your number
You do not need a financial planner to set a sensible college target. Work through these steps once a year and adjust.
- Estimate the bill in today's dollars. Look up an all-in annual cost for the type of school you expect (in-state public, out-of-state, or private) and multiply by four.
- Grow it for tuition inflation. Apply about 5% a year for the number of years until your child starts, so you are aiming at the future price, not today's sticker.
- Pick your coverage goal. Decide whether you are aiming for the full bill, half, or a fixed dollar amount, then set that as your target.
- Solve for the monthly contribution. Use a realistic return for the time horizon and let the college savings calculator tell you the monthly deposit, or check the by-age table above.
What to do if the number feels impossible
If the required monthly amount is more than your budget allows, you have real options, and skipping the goal entirely is the worst one. Start with whatever you can automate, even $50 a month, because an early small amount beats a late large one thanks to compounding. Redirect future raises and tax refunds into the plan, ask relatives to contribute to the 529 instead of buying gifts, and remember that financial aid, scholarships, in-state tuition, community-college transfers, and student work can all close the rest of the gap. The goal of a college fund is to reduce future borrowing, not to eliminate it perfectly. For a deeper look at the math of monthly saving toward any target, see our guide on how much to save per month to reach a goal, and browse the full savings calculators hub for related tools.
For neutral, official information on plan types and rules, the U.S. Securities and Exchange Commission maintains a plain-language primer at Investor.gov on 529 plans.
Try it yourself
Run your own numbers in the free College Savings Calculator — instant, private, no sign-up.
Open the College Savings Calculator →Frequently asked questions
- How much should I save per month for college?
- To cover about half of a four-year in-state public bill, a common benchmark is roughly $360 a month from birth in a 529 earning 6%. Starting later raises the figure sharply: the same half-the-bill goal needs about $580 a month if you start when your child is 8, because there are fewer years for compounding and tuition keeps rising. Use a realistic cost and return to set your own number.
- How much does it cost to fully fund four years of college?
- A direct estimate: at an illustrative all-in cost of about $27,000 a year today and 5% tuition inflation, four years for a newborn projects to roughly $280,000 in future dollars by the time they start. For a 12-year-old it is closer to $156,000 because there are fewer years of inflation left. These are planning figures, not national averages, so verify the cost for the schools you have in mind.
- Why does college cost grow faster than my savings?
- Because tuition has historically risen around 5% a year, faster than general inflation, the target keeps moving while you save for it. A college bill multiplies by about 2.41 over 18 years at 5%, while $10,000 saved at 6% grows to about $28,543. You need a return comfortably above 5% just to gain ground on the bill, which is why college money for a young child usually belongs in a growth-tilted 529, not a savings account.
- How much of college will my 529 plan cover?
- A steady contribution from birth typically covers a meaningful slice, not the whole bill. At 6% for 18 years, $200 a month grows to about $77,000 (roughly 28% of a $280,000 full four-year cost), $300 a month to about $116,000 (around 41%), and $500 a month to about $194,000 (around 69%). The rest is meant to come from income, aid, scholarships, and the student.
- Is it too late to start saving for college at age 12?
- No, but the monthly amount is much higher, so set realistic expectations. To fund half of a four-year in-state bill starting at age 12, you would need about $902 a month at 6%, versus $362 a month from birth. If that is out of reach, aim for a fixed dollar amount or a smaller share of the bill, automate what you can, and lean on aid and student contributions for the rest.
- What return should I assume for a college fund?
- Match the return to the time horizon. A 529 for a newborn can hold a stock-heavy mix and reasonably plan around a moderate 6% or so, while a fund for a teenager should be mostly conservative and assume a lower rate, because there is no time to recover from a downturn before tuition is due. When unsure, plan with a modest rate so you are more likely to meet or beat your target.
- Should I save for college or retirement first?
- Retirement comes first when money is tight, because you can borrow for college but not for retirement. Capture any employer match and fund your own future before maxing a college plan. Once retirement saving is on track, direct what you can to the 529. Underfunding retirement to fully fund college is one of the most common and costly college-planning mistakes.
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