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Compound interest calculator.
Explore a savings scenario with an initial deposit and monthly contributions. You can start at zero and keep a result to compare with a second scenario.
Final balance
Enter your values and calculate a scenario.
Monthly rounding to the nearest cent, with halves rounded up. The final loan payment is adjusted; very small loans may finish early. Additional costs are excluded. Illustrative simulation, not financial advice.
Assumptions and rounding
The annual rate is nominal and divided by 12. Interest compounds monthly before a contribution is added at month end. We assume a constant rate with no taxes, fees or inflation. Losses and volatility are not modeled: this is a simulation, not a guaranteed return.
Monthly rounding to the nearest cent, with halves rounded up. The final loan payment is adjusted; very small loans may finish early. Additional costs are excluded. Illustrative simulation, not financial advice.
An example to check
Example: €1,000 initially, €100 at each month end and a 12% nominal annual rate produce €1,110 after month 1 and €1,221.10 after month 2.
Investor.gov · Compound interest ↗