What is ROI?
Return on Investment (ROI) is a popular, straightforward financial ratio used to evaluate the efficiency and profitability of an investment. It measures the net return of an asset relative to its initial purchase cost, allowing investors to compare the performance of different investments.
Simple ROI Formula
The simple ROI formula is: ROI = (Net Profit / Cost of Investment) * 100.
Net Profit is calculated as the final investment value minus the initial investment cost. A positive ROI indicates a profit, while a negative ROI represents a financial loss.
Why Annualized ROI Matters
Simple ROI has a major flaw: it ignores the investment's time horizon. A 40% simple ROI earned over 8 years is far less impressive than a 40% simple ROI earned in 1 year. Annualized ROI solves this by calculating the geometric average annual rate of return, providing a standardized metric to compare investments of different durations.
Limitations of the ROI Metric
While highly useful, ROI does not factor in investment risk, taxes, inflation, or ongoing maintenance costs. For a complete analysis, investors should evaluate risk-adjusted returns alongside nominal ROI numbers.
Worked ROI Calculation Example
Suppose you buy shares of a stock for $25,000, and you sell them 4 years later for $38,000. Your net profit is $13,000 ($38,000 - $25,000).
Simple ROI: ($13,000 / $25,000) * 100 = 52.00%.
Annualized ROI: [(38,000 / 25,000)^(1/4) - 1] * 100 = [(1.52)^0.25 - 1] * 100 = 11.02% average annual return.
This shows that while your total capital grew by 52.00% over the entire holding period, your annualized compounded growth rate was 11.02%.
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