Compound Interest Calculator
Estimate how your investment grows with compound interest. Enter principal, annual rate, time and optional monthly contributions.
How to use
Enter values; results update instantly.
Formula
A = P(1+r/n)^(nt) + PMT * (((1+r/n)^(nt)-1)/(r/n))*(1+r/n)
Examples
- $10,000 at 5% for 10 years → ~$16,470
Important notes
Estimate only; actual returns vary.
Frequently asked questions
Is monthly compounding better?
More frequent compounding yields slightly higher returns.