Compound Interest Calculator
Simulate investment growth with recurring monthly contributions and custom compounding intervals.
Compound Growth Setup
Future Value Breakdown
$0.00
Total Accrued Balance
The Magic of Compounding
Compound interest is interest earned on interest. Over time, your investment growth accelerates because your earnings generate their own earnings, compounding your capital wealth exponentally.
Starting early is more critical than investing large sums. The longer your money compounds, the steeper the growth curve. Compound interest accounts for the vast majority of long-term wealth portfolios!
What is the Compound Interest Calculator?
The Compound Interest Calculator is the ultimate tool for wealth generation. It demonstrates how investments grow exponentially over time when the interest you earn begins earning interest of its own.
How It Works (Formula)
Unlike "Simple Interest" which only pays on the initial principal, Compound Interest scales geometrically. The formula factors in the starting balance, the annual rate, and crucially, the compounding frequency (daily, monthly, or annually).
$$ A = P \left(1 + \frac{r}{n}\right)^{nt} $$
The equation for exponential compound interest growth.
How to Use It
Enter your starting investment. If you plan to add money regularly, enter a monthly contribution. Input the estimated annual return (e.g., 8% for the stock market) and the number of years. Watch the graph explode upward as compounding takes effect.