Compound Interest Calculator
FV = P(1+r)^n + C × ((1+r)^n − 1) ÷ rPrincipal grows to $19,348, contributions add $104,185 → total ≈ $123,533
Free online tool
Compound Interest Calculator
See the power of compounding — enter your principal, rate, contribution and time period.
Instant calculation
Calculate Compound Interest
Enter your savings details to see future value.
Your result
Calculation
Your numbers stay in this browser. Nothing is uploaded or saved.
Three clear steps
How to use this calculator
- 01
Enter starting amount
Type your initial deposit or current balance.
- 02
Add contributions
Enter any regular monthly amount you plan to add.
- 03
Set rate and time
Enter the expected annual return and number of years.
- 04
See your future value
Calculate to see total future value, total contributions and interest earned.
The formula
How this calculation works
Future value combines the compounded principal and the future value of a series of regular contributions. r is the periodic rate, n is the number of periods.
Check the method
Worked examples
Each example follows the same formula used by the calculator.
What will $5,000 with $200/month grow to at 7% over 20 years?
Principal grows to $19,348, contributions add $104,185 → total ≈ $123,533≈ $123,533Common questions
Questions about this calculation
What is the Compound Interest Calculator?
The Compound Interest Calculator helps you calculate how your savings grow with compound interest over time. Enter your values and select Calculate to get an instant result.
How is the result calculated?
Future value combines the compounded principal and the future value of a series of regular contributions. r is the periodic rate, n is the number of periods.
Can you show an example?
Example: What will $5,000 with $200/month grow to at 7% over 20 years? — ≈ $123,533.
Is my data saved when I use the Compound Interest Calculator?
No. All calculations run locally in your browser. Your inputs and results are never uploaded, stored or shared with anyone.
Is the Compound Interest Calculator free to use?
Yes. The Compound Interest Calculator is completely free. No account, sign-up or payment is required. It works on mobile, tablet and desktop.
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