Compound Interest & Investment Growth Calculator
Calculate compound interest, future investment balance, monthly contributions, and total interest earned over time.
About This Tool
The Compound Interest Calculator determines how savings and investment portfolios grow over time using the compound interest formula with optional recurring monthly deposits.
Key Features
How to Use This Tool
- Enter Initial Principal investment amount.
- Enter Annual Interest Rate (%).
- Enter Investment Term (Years).
- Select Compounding Frequency and optional Monthly Contribution.
- View future portfolio value and total profit earned.
Why Use This Tool
- Plan retirement funds, stock index investing (S&P 500), and high-yield savings growth.
- Compare the exponential impact of starting early vs waiting.
Pro Tips
- The Rule of 72 estimates how many years it takes for an investment to double: 72 / Interest Rate.
Frequently Asked Questions
How does compound interest work?
Compound interest calculates interest on both the initial principal and the accumulated interest from previous compounding periods, creating exponential growth.
What is the Rule of 72?
The Rule of 72 is a quick mental math shortcut: divide 72 by your annual interest rate to estimate how many years it will take for your investment to double.
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