Are SmartWallet tools free to use?

Yes. All calculators and tools on SmartWallet are 100% free to use.

Do you store or share my financial data?

No. Calculations run locally in your browser and we do not store personal financial data.

We offer 20+ calculators including mortgage, loan, debt payoff, retirement, investment ROI, and more.

See how your money can grow over time with the power of compound interest.

Investment Parameters

Use this Compound Interest Calculator to enter your initial investment, contributions, and interest rate.

Initial Investment

Annual Contribution

Annual Interest Rate (%)

Compounding Frequency

Investment Period (Years)

Total Principal

Total Interest Earned

Final Value

Understanding Compound Interest

Interest on Interest: Compound interest is the interest you earn on both your principal and the accumulated interest from previous periods.
Time is Your Ally: The longer your money is invested, the more time it has to compound, leading to exponential growth.
Frequency Matters: The more frequently interest is compounded, the faster your money grows, assuming the same annual rate.
Regular Contributions: Adding regular contributions significantly boosts the power of compounding.
Rule of 72: Estimate how long money takes to double by dividing 72 by the annual rate.