Finance
Compound Interest Calculator
See how an initial investment and regular contributions can grow with compound interest over time.
Compound interest
Future value
$44,867.20
- Total contributions
- $29,000.00
- Interest earned
- $15,867.20
Share your result
How it works
Enter the starting amount, optional monthly contributions, annual rate, compounding frequency, and time period. The calculator compounds each period and adds contributions before interest is applied.
Formula
Each period: balance = (balance + contribution) × (1 + r/n), where r is the annual rate and n is the number of compounding periods per year.
Example
Invest $5,000 with $200 each month at 7% compounded monthly for 10 years. The future value is about $40,000, including contributions and compounded interest.