Compound Interest Calculator

Free compound interest calculator. Calculate investment growth over time with compounding. Supports monthly contributions and different compounding frequencies.

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Final Balance hesaplanacak
Total Contributions hesaplanacak
Total Interest Earned hesaplanacak
Growth Multiplier hesaplanacak

The Power of Compound Interest

Compound interest means earning interest on your interest — not just on the original principal. Over time, this creates exponential growth that Albert Einstein reportedly called "the eighth wonder of the world."

Compound Interest Formula

A = P × (1 + r/n)^(n×t)

  • A = Final amount
  • P = Initial principal
  • r = Annual interest rate (decimal)
  • n = Compounding periods per year
  • t = Time in years

With Regular Contributions

If you add money regularly (monthly contributions), the future value is:

A = P(1+r/n)^(nt) + PMT × [(1+r/n)^(nt) − 1] / (r/n)

Compounding Frequencies Compared

Frequencyn value$10,000 at 5% over 10 years
Annually1$16,289
Quarterly4$16,436
Monthly12$16,470
Daily365$16,487

Key Takeaways

  • Start early: Time is the most powerful variable. $1,000 invested at 20 grows far more than $1,000 invested at 40.
  • Reinvest returns: Never withdraw interest — let it compound.
  • Consistent contributions: Regular monthly deposits dramatically accelerate growth.

How to Use This Calculator

Using our calculator is simple: enter the required values into the input fields and click the calculate button. Results are displayed instantly on screen. You can adjust the values and recalculate to compare different scenarios and find the best option for your situation.

Frequently Asked Questions

QuestionAnswer
How accurate are the results?We use standard formulas and up-to-date 2025 rates. Individual circumstances may vary slightly.
Is this calculator free?Yes, completely free and no registration required.
What should I do for exact figures?For precise information, consult a relevant professional or official authority.
Does it work on mobile devices?Yes, it works seamlessly on all devices and screen sizes.

Important Notes

This calculator is provided for informational purposes only. For legal, financial, or medical decisions, always seek advice from qualified professionals. Calculation results do not constitute official documents. Legislative changes may affect results; please visit the relevant official website for the most up-to-date information. Our calculators are regularly updated to reflect current regulations and rates.

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Frequently Asked Questions

Compound interest means you earn interest on your interest. Each period, your interest is added to the principal, so the next period's interest is calculated on a larger base.
Regular monthly contributions are very effective due to dollar-cost averaging. Even small amounts compounded over 20-30 years can grow significantly.
Historically, a diversified stock market index has returned about 7-10% annually before inflation. Savings accounts and bonds offer lower but more stable returns.