Compound Interest Calculator
Project the future value of savings or investments with compound interest and optional regular deposits.
How to use it
- Enter your starting amount and rate Add the annual interest rate as a percentage.
- Choose the term and compounding Set the number of years and how often interest is added.
- Add regular contributions (optional) Include a recurring deposit to see its effect.
Examples
| $1,000 at 5% for 10 yrs (annual) | $1,628.89 |
|---|---|
| Same, compounded monthly | $1,647.01 |
About this tool
Compound interest is the reason long-term saving and investing can be so powerful: you earn returns not only on what you put in, but on the returns themselves. Over many years this snowball effect makes a large difference.
This calculator projects the future value of a lump sum, with optional regular contributions, for any rate, term and compounding frequency. It is for general illustration only and is not financial advice — investment returns are rarely constant. Everything runs in your browser.
Frequently asked questions
What is compound interest?
It is interest earned on both your original money and the interest already added, so savings grow faster over time than with simple interest.
How is the future value calculated?
Using FV = P(1 + i)ⁿ for the principal, plus an annuity term for regular contributions, where i is the periodic rate and n the number of periods.
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Updated June 12, 2026