Return on Investment (ROI)

In Depth

Return on Investment (ROI) is one of the most widely used financial metrics for evaluating and comparing the profitability of investments. The basic formula divides net profit (gain from investment minus cost of investment) by the cost of investment, expressed as a percentage. An ROI of 100% means the investment doubled in value. While conceptually simple, ROI can be applied across a wide range of business decisions: capital expenditure projects, marketing campaigns, technology implementations, acquisitions, hiring decisions, and R&D investments. However, basic ROI has important limitations. It does not account for the time value of money, a 50% return over one year is far more valuable than 50% over ten years. It does not capture risk differences between investments. And it can be manipulated by how "cost" and "gain" are defined. More sophisticated variants include annualized ROI (which adjusts for holding period), risk-adjusted ROI, and Economic Value Added (EVA). For capital-intensive decisions, executives typically supplement ROI with Net Present Value (NPV) and Internal Rate of Return (IRR), which explicitly account for the timing of cash flows. Despite its limitations, ROI remains the lingua franca of investment evaluation because it is intuitive, comparable across projects, and easy to communicate to stakeholders.