Compound Interest Calculator
Project compound growth from principal, annual rate, term, and compounding frequency.
Why use this tool
01Project how principal grows with compound interest over time, including final amount, interest earned, and effective APY based on annual rate and compounding frequency. Runs locally in your browser.
Compound Interest Calculator shows how reinvested interest changes a balance over months or years.
Use it to compare annual, quarterly, monthly, or daily compounding assumptions with the same principal and rate.
How to use
02Quick checks before you copy
03Confirm the input is the format you intended.
Scan the result before using it in a document, URL, config, or message.
Copy only the output you need.
FAQ
04What does compounding frequency change?
More frequent compounding applies interest more often, so future interest is calculated on a slightly larger balance.
What is effective APY?
Effective APY is the annualized return after compounding is included, which can be higher than the stated annual rate.
Can I use this result as financial advice?
No. The result is an informational estimate based on the values you enter. Check the math, fees, taxes, and local rules before making financial decisions.
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