Compound interest calculator
Estimate compound growth from principal, annual rate, years, and a selected compounding frequency.
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Interactive tool
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The compound interest calculator estimates how a principal grows at a selected number of compounding periods per year. It returns the final amount and the difference from the principal.
When to use this tool
- Explore a simplified savings-growth scenario.
- Compare how a nominal annual rate compounds over a selected number of years.
How to use
- Enter the principal.
- Enter the annual percentage rate, number of years, and compounding periods per year.
- Review the estimated amount and interest.
Example
Monthly compounding
A principal of 1,000 at 12% per year for 1 year with monthly compounding produces about 1,126.83.
How it works
- The implemented formula is A = P(1 + r/n)^(nt): the annual percentage rate is divided by 100 and n is the selected integer number of periods per year.
Limits and notes
- The interface accepts 1 to 365 compounding periods per year and does not accept deposits, withdrawals, fees, taxes, inflation, changing rates, or day-count conventions.
- The result is a mathematical estimate, not financial advice or a promised return.
- Inputs that make the periodic growth factor non-positive or the result non-finite are rejected.
Frequently asked questions
Can I choose annual, monthly, or daily compounding?
Yes. Enter 1, 12, or up to 365 compounding periods per year.
Are regular contributions included?
No. Only one initial principal is included.
Is the displayed interest simple interest?
No. It is the final compounded amount minus the principal.
References
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