FINANCE · Interest · Free compound interest calculator
Compound Interest Calculator: How Much Could Your Money Grow?
Estimate the future value of savings using a starting balance, monthly contributions and an expected return.
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Initial estimate
This result is generated in your browser. Review the calculation method and limitations alongside it.
What is compound interest?
A compound interest calculator estimates the future value of savings or investments when interest or returns are reinvested. This can lead to exponential growth. Use this tool to make a free estimate.
What this compound interest calculator estimates
- Projected balance at the end of the selected period
- Total amount contributed over time
- Estimated interest or returns accumulated over the period
- Year-by-year investment growth projection
Compound interest formula and calculation method
The calculator uses a compound interest formula and compounds contributions at the selected savings interval in your browser.
Free compound interest estimates versus personalized advice
This free tool provides a preliminary estimate of how compounding may affect savings. To work backward from a savings goal, try the savings calculator.
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Explore articles that explain the topic and its limitations, while keeping educational information separate from personalized advice.
Frequently asked questions about compound interest
What is compound interest?
It is the process of adding interest or returns from each period to the principal, so the combined balance can earn returns in later periods.
What expected return should I use?
Approximate annual examples are 1–2% for deposits, 2–4% for bond funds, 5–7% for mixed portfolios and 8–10% for stock portfolios.
Does this compound interest calculator cost anything?
No. You can use the calculator in your browser without creating an account.
How does time affect compound interest?
Over a longer period, compounding can have a greater effect on growth. The Rule of 72 is one way to estimate how long it may take for an amount to double.
Are returns guaranteed?
No. The figures are mathematical growth scenarios, not guaranteed returns.
What should I do with the result?
Use the monthly savings plan as a starting point when considering an investment portfolio that suits your circumstances.