Compound Interest Calculator
See how your money grows over time. Calculate compound interest with regular monthly additions and see the magic of compounding.
Investment Details
Future Value Details
Your wealth grew by this multiple over 10 years.
The Magic of Compound Interest
Albert Einstein reportedly called compound interest the "eighth wonder of the world." Unlike simple interest, where you only earn interest on your initial principal, compound interest allows you to earn interest on your interest. Over long periods, this creates a snowball effect that exponentially grows your wealth.
How This Calculator Works
This calculator uses an advanced formula that combines two different financial calculations:
- Compound Interest on Initial Principal: Calculates the growth of your initial lump sum over the entire tenure.
- Future Value of a Series (Annuity): Calculates the growth of your regular monthly additions.
Why Compounding Frequency Matters
The more frequently your interest is compounded, the faster your money grows. For example, monthly compounding will yield a slightly higher final amount than yearly compounding, even if the annual interest rate is exactly the same. Most mutual funds and stock market investments effectively compound continuously, while bank FDs compound quarterly.
Frequently Asked Questions (FAQ)
What is compound interest?
Compound interest is earning interest on interest. Instead of only earning interest on your initial principal (simple interest), compounding adds the interest you've earned back into your balance, so you earn interest on a larger amount in the next period.
How does compounding frequency affect my returns?
The more frequently interest compounds (e.g., daily, monthly, or quarterly vs. annually), the faster your money grows. For example, monthly compounding yields higher final returns than yearly compounding at the same interest rate.
What is the Rule of 72?
The Rule of 72 is a quick way to estimate how long it takes to double your money. Divide 72 by your annual interest rate (e.g., 72 / 8% = 9 years) to find the approximate number of years needed to double your investment.