Compound Interest Calculator
Calculate how your savings or investments can grow over time with compound interest. Add regular monthly contributions, choose your preferred currency, and see how your money could grow in the future.
How to Use
Select your preferred currency.
Enter your initial investment.
Enter your monthly contribution (or enter 0 if you won't add more money).
Enter the annual interest rate (%).
Enter the investment period in years.
Choose the compound frequency.
Click Calculate Compound Interest.
View your projected investment growth.
Example Calculation
This example shows how the Compound Interest Calculator works using sample figures.
Suppose you invest £5,000 initially, contribute £200 per month, earn an annual return of 5%, and invest for 10 years with monthly compounding.
Estimated Results
Final Balance: £39,291.50
Initial Investment: £5,000.00
Total Monthly Contributions: £24,000.00
Total Amount Contributed: £29,000.00
Total Interest Earned: £10,291.50
Investment Growth: 35.49%
Explanation
Over ten years, you contributed a total of £29,000 (£5,000 initially and £24,000 through monthly contributions).
Thanks to compound interest, your investment earned an additional £10,291.50, giving you a final balance of £39,291.50.
This example demonstrates how regular investing and compound interest can help grow your money over time.
Compound Interest Formula
How is compound interest calculated?
Our Compound Interest Calculator uses the standard compound interest formula together with regular monthly contributions to estimate how your investment could grow over time.
FV=PV(1+r)^n
What each symbol means
Symbol Meaning
FV Future Value (Final Balance)
PV Present Value (Initial Investment)
r Interest rate per compounding period
n Number of compounding periods
Why this formula is used
Compound interest allows your money to earn interest on both the original investment and the interest that has already been earned. This means your investment can grow faster over time compared with simple interest.
The longer you invest and the more regularly you contribute, the greater the potential effect of compound growth.
What Do These Results Mean?
Final Balance
The total value of your investment after adding all contributions and the interest earned.
Initial Investment
The amount you invested at the beginning.
Total Monthly Contributions
The total amount added through your monthly deposits during the investment period.
Total Amount Contributed
Your initial investment plus all monthly contributions.
Total Interest Earned
The profit generated through compound interest.
Investment Growth
The percentage increase in value compared with the total amount you invested.
Frequently Asked Questions
Is this Compound Interest Calculator free to use?
Yes. ToolNestPro's Compound Interest Calculator is completely free and can be used as often as you like.
Does this calculator work for all countries?
Can I include monthly contributions?
Yes. You can enter a monthly contribution to see how regular investing affects your investment over time.
Yes. Simply choose your preferred currency and enter your investment details to estimate future growth.
How accurate is this calculator?