About Compound Interest
Compound interest is the interest calculated on the initial principal and also on the accumulated interest from previous periods. Unlike simple interest, which is calculated only on the principal, compound interest allows your investment to grow exponentially over time. This calculator helps you project the future value of an investment or savings based on regular contributions and compounding frequency.
FAQ
Q: What is compound interest?
A: Compound interest is interest calculated on both the initial principal and the accumulated interest from prior periods. This "interest on interest" effect causes wealth to grow at an accelerating rate over time, making it one of the most powerful concepts in finance.
Q: How does compounding frequency affect returns?
A: The more frequently interest is compounded, the higher the effective return. For example, monthly compounding yields more than annual compounding at the same nominal rate, because interest starts earning interest sooner. However, the difference diminishes as frequency increases beyond monthly.
Q: What is the Rule of 72?
A: The Rule of 72 is a quick estimation method: divide 72 by the annual interest rate to approximate how many years it takes to double your money. For example, at 6% interest, it takes roughly 72 / 6 = 12 years to double your investment.
Q: What is the difference between simple and compound interest?
A: Simple interest is calculated only on the original principal for each period. Compound interest is calculated on the principal plus all previously accumulated interest. Over time, compound interest generates significantly more returns than simple interest at the same rate.
Q: How do regular contributions affect compound growth?
A: Regular contributions dramatically accelerate wealth accumulation. Each contribution begins earning compound interest from the moment it is added, creating multiple layers of compounding. Even small monthly contributions can result in substantial growth over long time periods.