College Fund Calculator
Calculate monthly savings needed to reach your child's college fund target.
Enter age, goal amount, and expected investment return rate for a savings plan.
A college savings fund grows through a combination of regular contributions and compound interest over many years. The most common vehicle in the United States is the 529 plan, which offers tax-free growth and tax-free withdrawals for qualified education expenses.
Future Value of Regular Contributions formula (annuity):
FV = PMT × [((1 + r)ⁿ − 1) / r]
What each variable means:
- FV — future value of the fund at the target date (e.g., when the child turns 18)
- PMT — monthly or annual contribution amount
- r — periodic interest rate (annual rate ÷ 12 for monthly contributions)
- n — total number of contribution periods
Worked example: A parent opens a 529 plan when their child is born and contributes $300/month for 18 years. The fund earns 7% annually (average stock-market-linked return).
r = 7% / 12 = 0.5833% per month n = 18 × 12 = 216 months FV = $300 × [((1.005833)²¹⁶ − 1) / 0.005833] FV = $300 × [(3.4607 − 1) / 0.005833] FV = $300 × [2.4607 / 0.005833] FV = $300 × 421.9 = $126,570
Total contributed: $300 × 216 = $64,800. Investment growth: $126,570 − $64,800 = $61,770 — nearly doubling the contributions.
Reference costs (2024–2025):
- Public in-state university: ~$11,000/year tuition + fees
- Public out-of-state: ~$29,000/year
- Private 4-year college: ~$43,000/year
- 4-year total (tuition only): $44,000–$172,000+
529 plan benefits:
- Contributions grow tax-free federally
- Withdrawals for education are tax-free
- Over 30 states offer a state income tax deduction on contributions
- Unused funds can be rolled over to a Roth IRA (up to $35,000 lifetime limit, as of 2024)
Tip: Starting at birth versus age 5 can nearly double the fund at age 18, thanks to compounding. Even small early contributions have a large long-term impact.