Compound Interest Calculator

Understanding Compound Interest

Compound interest is the interest on savings calculated on both the initial principal and the accumulated interest from previous periods. Think of it as "interest on interest." Over long periods, compounding can significantly accelerate the growth of your investments compared to simple interest.

The earlier you start investing, the more time your money has to benefit from the power of compounding. This makes it one of the most powerful tools for building long-term wealth.

Tips for Maximizing Your Growth

• Start Early: Time is the most important factor in compound growth. Even small contributions made early can outperform larger contributions made later in life.
• Be Consistent: Regular monthly contributions, no matter the size, ensure a steady flow of new capital that can start earning interest immediately.
• Reinvest Dividends: By automatically reinvesting dividends and interest, you increase your principal balance, which leads to even larger interest payments in the future.
• Minimize Fees: Investment fees can eat into your compounding returns over decades. Look for low-cost index funds or ETFs.

Real-World Examples

Consider two investors. Investor A starts saving $500 a month at age 25 with a 7% annual return. By age 65, they will have contributed $240,000, but their total balance could be over $1.2 million. Investor B waits until age 35 to start saving and must invest $1,000 a month to reach a similar balance by age 65, despite contributing much more out of pocket.

Use our comparison tool above to model your own scenarios and see how small changes in your monthly contributions or expected return rate can drastically impact your long-term wealth.