Simple Compound Interest Calculator with Monthly Contributions

 

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Compound Interest Calculator

With Monthly Contributions

Initial Principal ($): Monthly Contribution ($): Annual Interest Rate (%): Number of Years:

How to Use This Compound Interest Calculator

Follow these simple steps to see how your savings can grow over time with compound interest and regular monthly deposits:

1. Initial Principal ($)
   Enter the amount you start with (e.g., $1,000). This is your initial deposit.

2. Monthly Contribution ($)
   Enter how much you plan to add at the end of each month (e.g., $200).

3. Annual Interest Rate (%)
   Enter the yearly interest rate your bank or investment offers (e.g., 5 for 5%).

4. Number of Years
   Enter how many years you plan to keep saving and investing.

After filling in all fields, click the "Calculate" button. The calculator will instantly show:

• Final Amount — Total money you'll have at the end of the period (principal + contributions + interest).

• Total Contributions — How much you personally deposited (initial + all monthly contributions).

• Total Interest Earned — The extra money earned purely from compound interest.

💡 Example:
Start with $1,000, add $200 monthly at 5% annual interest for 10 years:
→ Final amount: $32,699.83
→ From $25,000 total contributions, you earn $7,699.83 in interest alone.

⚠️ Note: This calculator assumes interest compounds monthly and contributions are made at the end of each month. Results are estimates and do not account for taxes, fees, or inflation.