Formula
Future value uses A = P(1 + r/n)^(nt). Monthly contributions are added as a regular end-of-period deposit using the periodic rate.
Investment growth calculator
Compound Interest Calculator
Estimate how an initial deposit and regular monthly contributions can grow over time with compound interest. Adjust the rate, time, and compounding schedule to compare savings or investment scenarios.
Calculate future value
Future value
$0
Interest earned
$0
Total deposits
$0
Effective annual rate
0%
Example
$10,000 invested for 10 years at 6% with $250 monthly deposits grows much faster than the deposit total because each period's interest can earn more interest.
Useful for
Savings goals, retirement planning, investment comparisons, emergency fund growth, and long-term business reserve planning.
How to use this compound interest calculator
- Enter your starting balance.
- Add any monthly contribution you plan to make.
- Set the annual interest rate and the number of years.
- Choose the compounding frequency and calculate the result.
FAQ
What is compound interest?
Compound interest means interest is added to the balance, and future interest is calculated on the larger balance.
Does this guarantee investment returns?
No. The calculator is an estimate. Real investments can rise or fall and may include fees, taxes, or changing rates.