Compound Interest Calculator
Project investment growth with compound interest.
Everything is calculated in your browser. Nothing you enter is sent anywhere.
Tool
Investment details
Everything is calculated in your browser.
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About the compound interest calculator
Project how a starting balance and recurring contributions can grow with compound interest. Choose compounding and contribution frequency to match savings accounts, brokerage cash, or simple investment models.
How it works
Each compounding period applies the period rate to the balance. Contributions are added on their own schedule (monthly or annually) at the end of matching periods.
Compounding
More frequent compounding usually produces a slightly higher future value at the same nominal annual rate. Daily compounding uses 365 periods per year.
Limitations
Taxes, fees, inflation, and variable returns are not modeled. This is a deterministic educational estimate, not investment advice.
Privacy first
All calculations run locally in your browser. Nothing you type is sent to a Dockzio server.
FAQ
Quick answers to common questions.