How to Use the Compound Interest Calculator
1
Input Initial Principal
Enter your starting investment or deposit amount.
2
Set Monthly Additions
Specify how much additional money you will invest each month.
3
Enter Rate & Time
Input expected annual interest rate (%) and investment duration in years.
4
Inspect Growth Schedule
View future balance, total interest gains, and annual breakdown table.
Compound Interest Formula with Regular Deposits
The standard formula for future value with compound interest and recurring deposits:
A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) - 1) / (r/n)]
Where P is initial principal, r is annual interest rate (decimal), n is compounding frequency per year, t is time in years, and PMT is monthly deposit.
Why Choose Our Compound Interest Calculator?
Compound frequency options (Daily, Monthly, Quarterly, Annually)
Recurring monthly addition contribution support
Detailed year-by-year balance growth table
Separates principal deposits from interest gains
Visual financial summary metrics
Pro Tips for Best Results
- Starting early dramatically amplifies compound growth thanks to exponential interest accumulation.
- Reinvesting dividends accelerates portfolio compounding.