A performance metric for evaluating an investment’s efficiency and profitability, or comparing the efficiency and profitability of various assets. (Gain from Investment minus Cost of Investment) divided by 100 is the formula for ROI (Cost of Investment). The outcome is given as a percentage or a ratio. If the return on investment (ROI) is negative, the project is costing the company money. The estimate may differ depending on the gains and costs you enter.
Marketers nowadays want to track the return on every approach and channel they employ. Many aspects of marketing are quite simple to calculate ROI (such as PPC), but others are more challenging (like content marketing).