Finance

Compound interest calculator

Calculate future value and total interest earned with adjustable compounding frequency and a year-by-year growth table.

Principal ($)

Annual rate (%)

Compound frequency

Years

$—Future value

$—Interest earned

—%Effective annual yield

100% private. All processing happens locally in your browser — no files or data are ever sent to a server.

How to use Compound interest calculator

01 Fill in the required values using the fields provided
02 Results calculate automatically as you type
03 Copy or note the result — all calculations stay on your device

Frequently asked questions

Common questions about Compound interest calculator.

Is Compound interest calculator free to use?

Yes, Compound interest calculator is completely free. No account, subscription, or payment is ever required — just open the page and start using it.

Does Compound interest calculator upload my data to a server?

No. Compound interest calculator runs entirely in your web browser using client-side JavaScript. Your files, text, and data never leave your device, making it 100% private.

Can I use Compound interest calculator on my phone or tablet?

Yes. Compound interest calculator is fully responsive and works on all modern smartphones, tablets, and desktop browsers without installing any app.

Are these results accurate enough to rely on?

Compound interest calculator uses well-established formulas and provides accurate estimates for everyday use. For financial, medical, or legal decisions, always consult a qualified professional.

More Finance tools

Mortgage calculator

Calculate monthly repayments, total interest, and a full amortisation schedule for any mortgage.

Finance

Loan calculator

Calculate monthly repayments, total interest, and full amortisation schedule.

Finance

Tip calculator

Calculate tip amounts and split bills across any number of people.

Finance

About Compound interest calculator

Compound interest is the process by which interest earned on an investment is reinvested, so future interest is calculated on both the original principal and the accumulated interest. The Compound Interest Calculator shows the future value of any lump-sum investment, total interest earned, and a year-by-year growth breakdown. You can adjust the compounding frequency — annually, quarterly, monthly, or daily — to see how more frequent compounding affects long-term returns. This tool is useful for evaluating savings accounts, investment portfolios, and understanding the long-term impact of different interest rates on wealth growth.