Compound Interest Calculator
Estimate how savings grow with annual compounding and monthly contributions. Adjust the assumptions and explore the result. Nothing is sent to our servers.
How to interpret this: Currency selection changes only the symbol and formatting, not any exchange rate. All growth calculations use a fixed-rate, end-of-month-contribution model; results are examples, not offers or forecasts.
How this compound interest calculator works
This example assumes a fixed annual percentage rate divided into equal monthly compounding periods. Monthly contributions are deposited at the end of each month, and the initial balance earns interest for the full term.
The future value equals the initial amount multiplied by (1 + monthly rate) raised to the number of months, plus the future value of each monthly deposit. At a 0% rate, the balance equals the starting amount plus all contributions.
Try lowering the rate or shortening the time frame. A smaller estimate can show how sensitive the outcome is to your assumptions.
Important limitation: This does not model variable market returns, inflation, fees, tax, or annual percentage yield (APY) conventions. Verify how your actual account compounds interest.
Related reading
Compound interest explained · Building an emergency fund · Financial disclaimer
All calculators