Compound Interest Calculator Online Free
Estimate how your money can grow over time with compound interest. Add a starting amount, interest rate, time period and monthly contributions to see your future value.
Investment Details
Results
| Year | Starting Balance | Contributions | Interest | Ending Balance |
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How to Use the Compound Interest Calculator
Estimate long-term growth in three simple steps.
1. Enter your starting amount
Add your initial balance, expected interest rate and investment period.
2. Add contributions
Include monthly deposits and choose how often interest compounds.
3. Review growth
See future value, interest earned, total contributions and yearly growth.
See the power of compound growth.
Compound interest can make long-term saving and investing easier to understand. This calculator helps compare how principal, rate, time, deposits and compounding frequency affect future value.
You can estimate future investment value, include monthly contributions, review interest earned, compare effective annual rate and see a yearly balance breakdown.
What is compound interest?
Compound interest is interest earned on both the original amount and the interest that has already been added over time. This creates a growth effect where money can grow faster as time passes.
The longer the time period and the higher the rate, the more compounding can affect the final value.
When should you use it?
- Estimating investment growth over time
- Planning savings with monthly deposits
- Comparing compounding frequencies
- Understanding total interest earned
- Reviewing long-term finance scenarios
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Compound Interest Calculator FAQ
Common questions about compound interest and investment growth.
What is compound interest?
Compound interest is interest earned on both the original amount and the interest that has already been added over time.
Can I include monthly contributions?
Yes. This calculator lets you add monthly deposits and choose whether they happen at the beginning or end of each month.
What does compounding frequency mean?
Compounding frequency is how often interest is calculated and added to the balance, such as monthly, quarterly or annually.
Is this financial advice?
No. This calculator is for educational estimates only and does not guarantee investment results.
What is future value?
Future value is the estimated amount your investment or savings could be worth at the end of the selected time period.
What is interest earned?
Interest earned is the part of the final balance created by the interest rate, excluding the initial amount and contributions.
Can I copy the summary?
Yes. Click Copy Summary to copy the main calculator results.
Does it work on mobile?
Yes. This compound interest calculator works on desktop, tablet and mobile browsers.