How much could your money grow? This free calculator shows the power of compound interest — enter a starting amount, a monthly contribution, how long you’ll invest, and an expected annual return to see your estimated future value. It’s the single most important idea in investing: your returns start earning returns of their own.
Estimates only. Assumes a fixed return compounded monthly. Not investment advice.
How to Use This Calculator
Adjust the four inputs and the result updates instantly. Starting amount is what you invest today; monthly contribution is what you add each month; years is your time horizon; and annual return is your expected yearly growth rate (the long-run stock market average has historically been around 7–10% before inflation). The blue bar is what you put in; the red bar is compound growth on top.
Related: How to Start Investing With $100, 10 Investing Principles, and What Is an ETF?