Monthly Compound Interest Calculator
Calculate the future value of an investment with monthly compounding interest, including regular contributions.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Monthly Compound Interest Calculator
- Enter the Principal Amount ($): The initial sum of money you are investing or depositing. Must be 0 or greater.
- Enter the Annual Interest Rate (%): The yearly interest rate as a percentage (e.g., 5 for 5%). Must be 0 or greater.
- Enter the Number of Years: The total duration of the investment in years. Must be at least 1.
- Enter the Monthly Contribution ($): The fixed amount you add each month. Use 0 if no additional contributions. Must be 0 or greater.
- Click "Calculate": The calculator will display:
- Future Value: The total amount after all years, including contributions and compounded interest.
- Breakdown: Total contributions (principal + monthly deposits) and interest earned.
Note: All monetary values are in US dollars. The calculator uses monthly compounding (interest calculated 12 times per year).
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Frequently Asked Questions
Monthly compound interest means that interest is calculated and added to the principal balance each month, so you earn interest on interest.
Enter your initial principal, annual interest rate, number of years, and any monthly contribution. Click 'Calculate' to see the future value.
Simply set the monthly contribution to 0. The calculator will still compute the compounded growth of your initial principal.
