Understanding Compound Interest
Compound interest is often referred to as the "eighth wonder of the world." It is the interest you earn on both your original money and on the interest you keep accumulating. Over time, this creates a snowball effect that can significantly grow your wealth.
How the Compound Interest Formula Works
The standard formula for compound interest is A = P(1+r/n)^(nt), where:
- 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 (decimal)
- n = the number of times that interest is compounded per unit t
- t = the time the money is invested or borrowed for
The Power of Regular Contributions
While a lump sum investment grows nicely with compound interest, adding regular monthly contributions supercharges your growth. Our calculator uses the future value of a series formula to account for these ongoing deposits, showing you exactly how much of your final balance comes from your own pocket versus the magic of compounding.