How it works
Enter a starting amount, a monthly contribution, an annual interest rate and a number of years to see the final balance, assuming interest compounds monthly. Useful for planning savings goals or comparing investment scenarios.
Compound Interest Calculator
Calculate how an initial amount plus monthly contributions grows over time with compound interest.
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Final balance
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Total contributed
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Interest earned
FAQ
How does compounding work here?
Each month the balance earns interest, and that interest is added to the balance before the next month's contribution and interest are calculated.
Is this investment advice?
No — it's a mathematical projection based on a constant rate you enter. Real investments fluctuate and aren't guaranteed.
What's the difference between compound interest and simple interest?
Simple interest only grows on the original amount; compound interest also earns returns on previously earned interest, so the balance grows faster the longer you leave it.