Compound Interest Calculator
See how your investment can grow with the power of compounding.
Enter details to see the calculation.
Understanding Compound Interest
Compound interest is often called the "eighth wonder of the world," and for good reason. It is the interest you earn on both your initial principal and the accumulated interest from previous periods. In other words, it's "interest on interest," and it can make a deposit or loan grow at a much faster rate than simple interest.
How Does Compounding Work?
The magic of compounding lies in its exponential growth. When you invest money, you earn interest. With compound interest, that interest is added back to your principal amount. The next time interest is calculated, it's based on this new, larger total. This cycle repeats, accelerating your investment's growth over time. The more frequently interest is compounded (e.g., monthly vs. annually), the faster your investment grows.
The Formula for Compound Interest
The formula used by our calculator is:
A = P(1 + r/n)^(nt)
- A = the future value of the investment/loan, including interest
- P = the principal investment amount (the initial deposit or loan amount)
- r = the annual interest rate (in decimal form)
- n = the number of times that interest is compounded per year
- t = the number of years the money is invested or borrowed for
Our calculator handles all these variables for you, providing an instant and accurate projection of your investment's future value.
Best Practices to Maximize Your Returns
To truly harness the power of compounding, follow these best practices:
- Start As Early As Possible: Time is the most critical factor in compounding. The longer your money is invested, the more time it has to grow exponentially. Even small amounts invested early can outperform larger amounts invested later.
- Contribute Regularly: Make regular contributions to your investment account. This not only increases your principal but also allows you to take advantage of dollar-cost averaging in market-linked investments.
- Choose Higher Frequency Compounding: When comparing similar investment products, one that compounds more frequently (e.g., monthly vs. annually) will yield slightly higher returns over time.
- Reinvest Your Earnings: Ensure that any dividends or interest earned are automatically reinvested. This is the essence of compounding—earning returns on your returns.