Compound Interest Calculator Online — Free Tool
Determine the future value of your investments by calculating compounded growth with optional monthly contributions.
Compound Interest Calculator
Calculates compounded growth and optional monthly contributions.
About this tool
Compound interest is interest calculated on both your principal and previously earned interest, so growth accelerates over time. This calculator shows future value when you enter starting balance, periodic contributions, annual rate, and compounding frequency.
Adjust the term or rate to compare savings accounts, investment assumptions, or loan growth scenarios. All math runs in your browser—nothing is stored or sent to a server.
Common use cases
- Estimating long-term savings or investment growth
- Teaching how compounding frequency changes outcomes
- Comparing two rate scenarios side by side
How to use
- Enter your values in the calculator fields above.
- Review the computed totals, rates, or schedules.
- Adjust inputs to compare different scenarios.
This page is available at /tools/compound-interest-calculator/.
Related keywords
- compound interest calculator
- compound interest
- investment calculator
- future value
- monthly contribution
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FAQ
What is Compound Interest Calculator?
Compound Interest Calculator is an online numbers tool that determine the future value of your investments by calculating compounded growth with optional monthly contributions.
How do I use the Compound Interest Calculator?
Enter your amounts, rates, and dates in the fields above. Results update instantly as you type, with no account or download required.
Is this tool free?
Yes—this tool is free to use with no account required.
Does it run locally in the browser?
Yes. Calculations and transformations run in your browser—your input stays on your device.