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Return on Investment (ROI)

A performance metric that measures the gain or loss of an investment relative to its cost, expressed as a percentage.

Return on Investment (ROI)

Return on Investment (ROI) measures how much gain or loss an investment generates relative to its cost. It is one of the most widely used metrics in finance, business analysis, and personal investing because of its simplicity and versatility.

The Formula

ROI = [(Final Value − Initial Investment) / Initial Investment] × 100

Example:

  • You buy $10,000 worth of stock
  • Three years later it is worth $13,500
  • ROI = ($13,500 − $10,000) / $10,000 × 100 = 35%

Note that this 35% is the total return over the entire period — it does not account for the time taken.

Annualized ROI

To compare investments across different time periods, use annualized ROI (which is identical to CAGR for single investments):

Annualized ROI = [(Final Value / Initial Value)^(1/years) − 1] × 100

For the example above (3 years): (13,500 / 10,000)^(1/3) − 1 = 10.6% per year

This allows fair comparison — a 35% return in 3 years (10.6%/year) vs. a 40% return in 5 years (6.96%/year) clearly favors the first option on a per-year basis.

ROI Across Different Contexts

Investment ROI: How much your portfolio or specific investment has grown.

Business ROI: Revenue or profit generated by a specific business initiative divided by its cost. Marketing spend, equipment purchases, and employee training all have calculable ROIs.

Real estate ROI: Combines rental income and property appreciation minus costs (mortgage, maintenance, taxes).

Education ROI: Increased lifetime earnings minus the cost of tuition, foregone income, and student loan interest.

What Is a "Good" ROI?

Context determines what counts as a good ROI:

| Context | Good ROI Benchmark | |---------|-------------------| | Stock market (S&P 500 average) | ~10% nominal / ~7% real | | Real estate investment | 8–12% | | Business venture | 15–25%+ | | Savings account | Current high-yield rates (4–5% in 2024) | | Starting a business | Highly variable; positive within 2–3 years is healthy |

Limitations of ROI

  • Ignores time: A 100% ROI in 10 years is far less impressive than 100% in 2 years.
  • Ignores risk: High ROI often comes with high risk; comparing ROIs without risk context is misleading.
  • Cash flow not captured: ROI on a rental property may look modest but cash flow matters.

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