Estimate how your money could grow over time with compound interest. This free compound interest calculator shows future balance, total contributions, total interest earned, and inflation-adjusted value.
Enter your values and click Calculate to estimate compound growth over time.
This compound interest calculator estimates how a starting amount can grow over time when interest is earned on both the original principal and previously earned interest.
It also supports recurring monthly contributions, so you can see the effect of adding money regularly. The results show future balance, total contributions, total interest earned, and an inflation-adjusted value in today’s dollars.
The standard compound interest formula for a lump sum is:
A = P × (1 + r / n)nt
Where:
When monthly contributions are included, the future value of those recurring deposits is added to the result separately.
Time is one of the biggest factors in compound growth. Even small balances can grow substantially when given enough time.
Consistent monthly contributions can greatly increase the final balance and take full advantage of compounding.
A slightly higher interest rate can lead to much larger ending values over long periods because the growth compounds on itself.
Inflation can reduce the value of future money, so comparing the inflation-adjusted result can give a more realistic picture.
Compound interest is interest earned on both your original principal and on interest that has already been added to the balance.
Simple interest only applies to the original principal, while compound interest grows faster because interest earns interest over time.
Yes. More frequent compounding generally produces a slightly higher ending balance because interest is added more often.
Yes. This calculator works well for savings accounts, general investing estimates, long-term goals, and other compound growth scenarios.