Investment Calculator: Portfolio Growth & Compound Returns
Free online investment calculator. Project portfolio growth, compound investment returns, and wealth accumulation across stocks, index funds, and monthly contributions.
Ending Investment Value
Total Out-of-Pocket Invested
Total Investment Returns
Real Purchasing Power
Annual 4% Cash Flow
Annual Growth Trajectory
Invested vs. Returns| Year | Start Bal | Deposits | Returns | Ending Portfolio |
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How an Investment Calculator Projects Wealth
Building long-term wealth through investing relies on three primary variables: your initial capital, your regular recurring contributions, and the annual rate of return generated by your asset allocation. Compounding returns create exponential growth because the returns earned each year are reinvested to produce their own returns.
Historical Stock Returns (S&P 500)
Over the past 50+ years, the broad US stock index has averaged approximately 10% nominal annual return (or roughly 7% real return after inflation). Equities have consistently outperformed cash and fixed income over 15+ year holding periods.
The Power of Dollar-Cost Averaging
Investing fixed recurring amounts (e.g. $500/month) eliminates the risk of trying to time market tops and bottoms. When stock prices drop, your fixed monthly deposit automatically acquires more shares at a discount.
Nominal Returns vs. Real Inflation-Adjusted Returns
When evaluating 20 or 30-year projections, it is vital to account for inflation. A portfolio of $1,000,000 thirty years from now will not purchase the same basket of goods as $1,000,000 today. By toggling our inflation adjustment feature, you can see your true purchasing power expressed in today's dollars using the Fisher equation: (1 + Real Rate) = (1 + Nominal Rate) / (1 + Inflation Rate).
Related Financial Calculators
Examine other dimensions of your financial portfolio with our Compound Interest Calculator, model early financial independence with the FIRE Calculator, or forecast dividends with our Dividend Reinvestment Calculator.
Frequently Asked Questions
What is a realistic annual rate of return for an investment calculator?
Historically, the broad US stock market (S&P 500) has generated an average nominal return of approximately 10% annually over long multi-decade horizons (or roughly 7% after adjusting for inflation). A diversified portfolio of stocks and bonds typically targets 6% to 8% nominal annual return.
How do regular recurring investments compare to a one-time lump sum?
Regular recurring investments (Dollar-Cost Averaging) reduce timing risk and volatility by consistently purchasing shares at both market highs and lows. While lump-sum investing mathematically outperforms about 68% of the time due to long-term market upward trends, recurring monthly deposits instill discipline and build substantial wealth steadily.
What is the difference between nominal return and real return?
Nominal return is the raw percentage gain generated by your investments before inflation. Real return is the purchasing power gain after subtracting the rate of inflation (Real Return ≈ Nominal Return - Inflation Rate).
How does compound interest multiply investment portfolios over time?
Compound growth creates exponential portfolio expansion. In the early years, personal contributions make up the majority of your balance; however, after 10 to 20 years, investment returns and compounded earnings account for over 60% to 80% of total portfolio value.