Compound Interest Calculator
Explore how time, contributions, and return assumptions combine to grow long-term savings.
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Advanced assumptions
These are scenario assumptions, not verified local rules or lender terms. Only change options supported by your documents.
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Projected balance
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How the compound interest calculator works
Project investment growth with compound returns and regular monthly contributions.
Future value combines compound growth on the initial balance with the future value of recurring contributions.
Example
$10,000 invested for 10 years at 7%, plus $250 each month, grows through both contributions and compounded returns.
What affects the result
- More time allows returns to compound over more periods.
- Regular contributions can matter as much as the starting balance.
- Actual market returns vary and are not guaranteed.
Helpful guides
Frequently asked questions
What does compounding mean?
Compounding means earning returns on both your original money and prior returns.
Is the result guaranteed?
No. It is a mathematical projection based on a constant rate, not a prediction of investment performance.