Investment Calculator
Calculate how your investments grow over time with compound interest. Enter initial investment, monthly contributions, expected annual return, and investment period to see your projected wealth. View year-by-year growth charts showing the power of compound interest. Whether you are saving for retirement, a home, or financial independence, this tool helps you plan your investment strategy.
Investment Calculator
Calculate compound interest and see how your investments grow over time.
Final Balance
$343.8K
Total Invested
$130.0K
Interest Earned
$213.8K
Growth Over Time
How to Use Investment Calculator
- 1Enter your initial investment amount
- 2Enter monthly contribution amount
- 3Set the expected annual return rate (%)
- 4Set the investment period in years
- 5View projected final balance, total contributions, and interest earned
Your Privacy is Protected
Investment Calculator runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
Frequently Asked Questions
What is compound interest?
Compound interest is interest calculated on both the initial principal and the accumulated interest. Over time, this creates exponential growth — often called "the eighth wonder of the world."
What return rate should I use?
The S&P 500 has historically returned about 10% per year before inflation (7% inflation-adjusted). Use 6-8% for a conservative estimate with diversified investments.