See how your money grows with compound interest over time. Calculate investment growth with monthly contributions and visual charts.
Compound interest is often called the "eighth wonder of the world." It means you earn interest not just on your initial investment, but also on the interest you've already earned. The earlier you start, the more powerful it becomes.
Enter your investment details — Input your initial investment, monthly contribution, expected annual interest rate, and investment timeline in years.
Select compounding frequency — Choose how often interest is compounded: Daily, Monthly, Quarterly, or Annually. More frequent compounding yields higher returns.
Click Calculate — Instantly see your final amount, total invested, and total interest earned. A year-by-year breakdown and growth chart are displayed below.
The calculator uses the compound interest formula: A = P(1 + r/n)^(nt) where A is the final amount, P is the principal, r is the annual rate, n is the number of compounding periods per year, and t is the time in years.
Monthly contributions are calculated separately and added to the principal at each compounding period, then compounded forward alongside the existing balance.
Compound interest is interest on a loan or deposit calculated based on both the initial principal and the accumulated interest from previous periods. It is often described as interest on interest.
Simple interest is calculated only on the principal amount. Compound interest is calculated on the principal plus all previously accumulated interest, leading to exponential growth over time.
Interest can be compounded annually, quarterly, monthly, daily, or continuously. More frequent compounding results in higher returns.
No. This calculator shows nominal growth. To see real purchasing power, subtract an estimated inflation rate from the annual rate.
No. This calculator provides estimates based on the inputs you provide. Actual returns may vary due to market conditions, fees, taxes, and other factors.
No. All our tools are free to use and work directly in your browser without registration or sign-in. Just open the page and start using the tool.
Yes. The tool is fully responsive and works on any modern browser on iPhone, iPad, Android phones and tablets. The interface adapts to your screen size automatically.