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🔒 Calculates in your browser — nothing is uploaded

Compound Interest Calculator

Calculate compound interest with any compounding frequency and optional monthly additions. It runs entirely in your browser — no signup, no installation, and nothing you paste or drop leaves your device.

End capital—
Paid in—
Interest earned—
Year Balance Paid in Interest

Amounts are rounded to the nearest cent for display. One comma or dot is the decimal separator (1000,50 or 1000.50). Monthly compounding credits interest twelve times a year and each contribution earns interest from the month after it is paid; annual compounding credits interest once a year on the balance at the start of that year. Taxes, fees and inflation are not included — this is a projection, not a promise.

How This Compound Interest Calculator Works

Enter a starting capital, a monthly contribution, an annual interest rate and a term in years, and the calculator shows three figures: the end capital, the total amount paid in and the interest earned. A table below lists the balance, payments and interest at the end of each year — for long terms the first ten years plus the final year. The two compounding options really differ. With monthly compounding interest is credited twelve times a year, and each contribution earns interest from the month after it is paid. With annual compounding interest is credited once a year on the balance at the start of that year, so contributions paid in during the year first earn interest the year after. The rate must be between 0 and 1000 percent; negative rates, taxes, fees and inflation are not included, and the figures are a projection, not a promise. Nothing is uploaded: it runs in your browser.

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What is Compound Interest Calculator?

Compound Interest Calculator is a free online calculator built for anyone planning a loan, investment, salary or purchase. Calculate compound interest with any compounding frequency and optional monthly additions In practice you enter the principal, annual rate and term, choose the compounding frequency and any monthly addition, and then read the final balance and total interest.

The figures you enter are calculated locally; no number is transmitted or stored, so the tool is safe for real salaries, loans and client figures.

How to use Compound Interest Calculator

  1. Enter the principal, annual rate and term.
  2. Choose the compounding frequency and any monthly addition.
  3. Read the final balance and total interest.

Compound Interest Calculator FAQ

Is Compound Interest Calculator free to use?

Yes. Compound Interest Calculator is completely free and needs no account, no trial and no payment details. Every feature on the page is available without limits.

Is my data uploaded anywhere?

No. Compound Interest Calculator runs entirely in your browser, so the text, file or number you enter never leaves your device.

Does Compound Interest Calculator work on a phone or tablet?

Yes. It works in any modern browser on desktop, tablet and phone. There is no app to install and no account to create.

How do I use Compound Interest Calculator?

Enter the principal, annual rate and term. Choose the compounding frequency and any monthly addition. Read the final balance and total interest.

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