Compound Interest Calculator

Calculate future value, interest earned, and total contributions with optional regular deposits.

Initial Principal

Annual Interest Rate (%)

Investment Period (Years)

Compounding Frequency

Regular Contribution

Contribution Frequency

Final Balance — —

Total Contributions — —

Total Interest Earned — —

Growth Multiple — —

Formula guide: Principal growth uses compound interest: A = P(1 + r/n)^nt. Regular contributions are treated as end-of-period deposits at the selected contribution frequency.