Investment Growth Calculator
Project how your investments will grow over time with regular contributions and compound returns.
What Is an Investment Growth Calculator?
An investment growth calculator projects the future value of your investments based on an initial deposit, regular contributions, expected return rate, and time horizon. It uses the compound growth formula to show how much of your final balance comes from your own deposits versus investment returns, demonstrating the power of long-term investing.
How to Use This Calculator
Enter Your Starting Amount
Input any initial investment amount. This could be money already in a brokerage account, an inheritance, or savings you want to invest.
Set Monthly Contributions
Enter how much you will invest each month. Even $100/month grows significantly over decades.
Choose Expected Annual Return
Use historical averages: 7% for a balanced portfolio, 10% for all-equities (both nominal). Conservative estimates use 5-6%.
Set Your Time Horizon
Longer periods dramatically increase returns through compounding. See how time transforms your contributions.
Key Concepts
Dollar-Cost Averaging
Investing a fixed amount regularly means you buy more shares when prices are low and fewer when high. This smooths out market volatility over time.
Asset Allocation
Your mix of stocks, bonds, and other assets determines your expected return and risk. Younger investors can typically afford a higher equity allocation.
Expense Ratios
Fund fees compound against you. A 1% fee vs 0.05% on a $500,000 portfolio costs about $5,000/year more, money that no longer compounds in your favor.
Diversification
Spreading investments across asset classes, sectors, and geographies reduces risk without necessarily reducing expected returns.
Expert Insights
Total US stock market index funds (like VTI or VTSAX) have been the single most effective long-term wealth building tool for average investors, delivering broad diversification at near-zero cost.
Reinvesting dividends typically accounts for 40-50% of total stock market returns over multi-decade periods. Always enable automatic dividend reinvestment.
Avoid checking your portfolio daily. Research shows investors who check frequently trade more, incur higher costs, and earn lower returns than those who check quarterly or annually.
Frequently Asked Questions
This calculator provides estimates for educational purposes only. Actual results depend on your specific financial situation, lender terms, and market conditions. Consult a qualified financial advisor before making major financial decisions.
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