Compound Interest Calculator
See the power of compound interest. Calculate how your savings or investments will grow over time with regular contributions and compound earnings.
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What is Compound Interest?
Compound interest is interest on a loan or deposit calculated based on both the initial principal and the accumulated interest from previous periods. Often called \"interest on interest,\" compound interest grows your money exponentially over time.
The Rule of 72
Want to quickly estimate how long it takes to double your money? Divide 72 by your annual interest rate. At 7% return, your money doubles in approximately 10.3 years (72 / 7 = 10.3).
Why Start Early?
Starting to invest at age 25 vs. 35 can mean a difference of hundreds of thousands of dollars by retirement. Time is your greatest asset when it comes to compound interest.