Stock Investment ROI Calculator
Calculate ROI on stock investments. See total return, annualized return (CAGR), and compare against benchmark returns.
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About This Calculator
Stock investment ROI should always be measured as total return — price appreciation plus dividends received — over the holding period. Annualizing the return (CAGR) allows fair comparison between investments held for different time periods. Compare your returns against the S&P 500 index to determine if active investing is adding value over passive indexing. This calculator computes both simple and annualized returns on your stock investments.
Industry Insights
- Total return includes dividends, not just price appreciation. A stock that rises 5% and pays a 3% dividend returned 8% total. Comparing stocks by price charts alone ignores the dividend component that drives 40% of historical S&P 500 returns.
- Annualized return and average return are different. A stock that gains 50% in year one and loses 33% in year two has an average return of 8.5% but an annualized return of 0%. Always use CAGR (compound annual growth rate) for multi-year comparisons.
- Dollar-cost averaging (investing a fixed amount on a regular schedule) historically outperforms lump-sum investing about 33% of the time, but it dramatically reduces the risk of investing a large sum right before a market downturn.
Related Calculators
For authoritative guidance, see SEC — Understanding Investment Returns.
Frequently Asked Questions
What is a good ROI for stock investments?
The S&P 500 has historically returned approximately 10% annually before inflation, 7% after inflation. Individual stocks vary widely. A consistent 10-15% annual return over 10+ years is considered excellent. Comparing your returns to a low-cost index fund benchmark is the best measure of performance.
What is CAGR and how is it calculated?
CAGR (Compound Annual Growth Rate) is the annualized return of an investment over a period. Formula: CAGR = (Ending Value / Beginning Value)^(1/Years) - 1. A $10,000 investment growing to $15,000 over 3 years has a CAGR of 14.47%. CAGR smooths out volatility to show the steady growth rate equivalent.
Should I include dividends in my stock ROI calculation?
Yes. Total return includes both price appreciation and dividends received. Dividend reinvestment significantly increases long-term returns through compounding. For dividend stocks, dividends can represent 30-50% of total historical returns over long periods.
How does stock ROI compare to real estate ROI?
Stocks historically return 10% annually (S&P 500 average). Real estate total returns (appreciation + rent) average 8-12% but with leverage amplifying gains and losses. Stocks offer better liquidity and diversification. Real estate offers leverage, depreciation tax benefits, and tangible asset ownership. Most financial advisors recommend both in a diversified portfolio.
The calculators on The Simple Toolbox are for educational and planning purposes only. Results are estimates based on your inputs and standard assumptions — they are not financial, legal, or tax advice. Consult a qualified professional before making significant financial decisions.
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