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Investment Calculator
Project how much your investment could grow over time with regular contributions and compound returns.
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How this calculator works
This calculator projects the future value of an investment portfolio by combining a starting balance, regular monthly contributions, and compound growth at an expected annual rate of return.
The method
Each month, the running balance grows by the monthly rate of return (annual return divided by 12) and then the new contribution is added, compounding month over month across the full time period.
This is a planning projection based on a constant assumed rate of return; actual investment returns fluctuate and are never guaranteed. For general education only.
Last reviewed August 2026