Project Your Wealth Growth
Investing in the stock market is the most reliable way to build wealth over a lifetime, but the math is hard to visualize. Our Investment Calculator helps you model out 10, 20, or 40 years of growth to see exactly how your portfolio will compound over time.
The Three Levers of Wealth
When planning your investments, you only have control over three variables. Adjusting these levers on the calculator will drastically change your outcome:
- Initial Investment: A large lump sum jump-starts the compounding process immediately, doing the heavy lifting early.
- Monthly Contributions: Consistency is key. Even if you start with $0, automatically investing $500 every month into a diversified index fund will make you a millionaire over a working career.
- Time Horizon: The most powerful lever. Due to the exponential nature of compounding, the years at the end of the timeline produce massive, unbelievable growth. Delaying investing by just 5 years can cut your final retirement balance in half.
How to Use This Tool
- Upload or Input Data: Select your file or paste your data directly into the tool interface. Everything remains on your device.
- Configure & Process: Adjust any optional settings if necessary. The tool will process your data instantly inside your browser.
- Download Result: Preview the output and click the download or copy button to save your final results.
Frequently Asked Questions
What rate of return should I expect?
For a heavily diversified stock portfolio (like an S&P 500 or Total World ETF), historical averages suggest a 7% to 9% annual return before inflation. Bonds yield much lower returns but offer price stability.
Should I invest a lump sum or dollar-cost average?
Mathematically, investing a lump sum immediately beats Dollar Cost Averaging (spreading it out monthly) about 66% of the time, because markets go up more often than they go down. However, DCA is better psychologically for nervous investors.
Does this factor in taxes?
No, this calculator assumes gross growth. To minimize tax drag on your compounding growth, you should utilize tax-advantaged accounts like a Roth IRA or 401(k) where possible.