College Savings Calculator (529 Plan)
Estimate the monthly savings contribution needed to fund your child's college education through a 529 plan. Use this when starting or adjusting a college savings strategy based on your child's current age, expected costs, and existing savings.
About this calculator
This calculator determines the required monthly contribution to meet a future college cost target. First, it projects the total 4-year college cost at the time your child turns 18 using the formula: FutureCost = currentAnnualCost × 4 × (1 + inflationRate)^(18 − childAge) × coveragePercentage. It then subtracts the future value of any existing savings: FV_savings = currentSavings × (1 + investmentReturn)^(18 − childAge). The remaining gap is funded by monthly contributions compounded at the investment return rate, using the future value of an annuity formula: Gap = PMT × [((1 + r)^n − 1) / r] × 12, solved for PMT. Here r is the annual investment return and n is the number of years until college. This approach accounts for both inflation eroding purchasing power and investment growth building savings.
How to use
Assume your child is 8 years old, current annual college cost is $30,000, education inflation is 5%, expected investment return is 7%, existing savings are $10,000, and desired coverage is 100%. Years to college: 18 − 8 = 10. Future 4-year cost = $30,000 × 4 × (1.05)^10 × 1.00 = $120,000 × 1.6289 ≈ $195,468. Future value of current savings = $10,000 × (1.07)^10 ≈ $19,672. Gap = $195,468 − $19,672 = $175,796. Monthly PMT = $175,796 / [((1.07^10 − 1) / 0.07) × 12] = $175,796 / [13.816 × 12] ≈ $175,796 / 165.8 ≈ $1,060/month.
Frequently asked questions
What is a 529 plan and how does it help with college savings?
A 529 plan is a tax-advantaged savings account specifically designed to fund education expenses. Contributions are made with after-tax dollars, but earnings grow tax-free and withdrawals are also tax-free when used for qualified education expenses such as tuition, room and board, and textbooks. Many states also offer a state income tax deduction for contributions. The plans are flexible — funds can be transferred to another family member if your child doesn't attend college, and since 2019 up to $10,000 per year can even be used for K–12 tuition.
What education inflation rate should I use in the college savings calculator?
College costs have historically risen faster than general inflation, averaging roughly 4–6% per year over the past two decades, compared to general CPI inflation of about 2–3%. Using 5% as your education inflation rate is a common and reasonably conservative assumption. Underestimating inflation leads to a savings shortfall, so it's better to use a slightly higher rate and save a bit more than needed. You can always revisit and adjust your monthly contribution as your child gets older and actual tuition increases become clearer.
How does starting college savings early affect the monthly contribution required?
Starting early has a dramatic compounding effect that dramatically reduces the monthly savings burden. For example, starting at birth versus age 10 could cut your required monthly contribution by more than half for the same target amount, because your money has 18 years versus 8 years to compound. Every year of delay not only shortens the compounding runway but also increases the future cost due to ongoing education inflation. Even small monthly contributions started early can grow into significant college funds, making early action the single most powerful lever in college savings planning.