💰
Compound Interest Calculator
Watch your money grow over time
8%
10
-
Future Value
-
Deposited
-
Interest
-
Growth
What is Compound Interest?
Compound interest is interest on both principal and accumulated interest. The Rule of 72: divide 72 by your annual return to estimate doubling time. At 8%, money doubles in about 9 years.
Frequently Asked Questions
What is the Rule of 72?
Divide 72 by your annual interest rate to estimate how many years it takes to double your money. At 8% return, your money doubles in approximately 9 years.
How often is interest compounded?
This calculator assumes monthly compounding, which is the most common for savings and investment accounts.
Why start investing early?
Due to compound interest, starting 10 years earlier can result in significantly more wealth than contributing more money later. Time is the most powerful factor.