Compound Interest with Monthly Contributions Calculator
See how your savings or investments can grow when you combine a starting balance with steady monthly contributions and compounding returns. Adjust the rate, term, and contribution amount to explore different scenarios.
About this calculator
Project investment growth over time with an initial deposit, recurring monthly contributions, and compounding interest, including a full contribution vs. growth breakdown.
Frequently Asked Questions
Does this account for taxes or fees?
No, this is a gross growth projection. Taxes, account fees, and fund expense ratios will reduce your actual real-world return.
How is compounding calculated here?
Interest compounds monthly, and your monthly contribution is added at the end of each month, similar to how most retirement and brokerage accounts are modeled.
What return rate should I assume?
Historically, diversified stock portfolios have returned around 7-10% annually before inflation over long periods, though returns vary significantly year to year.