Compound Interest Calculator
Visualize your financial future. See how small monthly contributions grow into significant wealth over time.
Estimated Future Balance
$107,144
Total Contributions
$70,000
The total cash you put in.
Compound Interest
$37,144
Profit earned from compounding.
?What is Compound Interest?
Albert Einstein once called Compound Interest the “8th wonder of the world." Unlike simple interest, which only grows your initial principal, compound interest adds interest back into your balance so you earn interest on your interest.
The most important factor in compounding isn't the amount of money you start with—it's time. By starting early, even small monthly contributions can snowball into significant wealth because the growth becomes exponential in the later years.
How to Use This Tool
Initial Deposit
The starting amount of money you have available to invest today.
Monthly Contribution
How much you plan to add to this investment every single month.
Return Rate
Annual percentage rate. For context, the S&P 500 average is roughly 7-10%.
Time Horizon
Adjust the slider to see how much your money grows if you leave it for 10, 20, or 40 years.
A Financial Reality Check
Calculations are based on monthly compounding. Real-world returns fluctuate based on market conditions, taxes, and inflation. This tool is for illustrative purposes to help you plan your savings goals. Always consult with a certified financial advisor for personalized investment advice.