calculators• Investing
Compound Interest & Investment Calculator
Harness the power of compounding. Calculate how your initial principal and monthly contributions grow exponentially over time with reinvested earnings and annual returns.
Calculations run locally in browser memory.
Investment Strategy
Terminal Portfolio Value
Balance in 15 Years
$216,520
Your Total Deposits:
$100,000
Total Interest Earned:
+$116,520
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How to Use Compound Interest Calculator
1
Enter Initial Principal
Input your starting investment balance.
2
Set Monthly Contribution & Return
Enter how much you deposit monthly and your estimated annual interest rate %.
3
Inspect Growth Curve
Explore the year-by-year balance table and visual accumulation curve.
About Compound Interest Calculator
Applies the compound interest formula A = P(1 + r/n)^(nt) + PMT * [((1 + r/n)^(nt) - 1) / (r/n)] to project terminal balances.
Operational Limits
- •Does not account for unpredictable market volatility
Key Features
- Visual compounding growth chart over 1 to 30 years
- Flexible compounding frequencies (Annually, Semi-Annually, Monthly, Daily)
- Clear separation of Total Principal Invested vs Total Interest Earned
- Year-by-year financial accumulation breakdown table
- Interactive sliders for instant scenario analysis
Frequently Asked Questions
Divide 72 by your annual interest rate to determine approximately how many years it takes for your investment balance to double.
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