The marketing ROI formula for calculating return on investment is dependent on you earn on your portfolio or bank account, it's calculated as a percentage. The formula for return on investment, sometimes referred to as ROI or rate of return, measures the percentage return on a particular investment. ROI is used to. Return on investment or ROI is a profitability ratio that calculates the profits of an investment as a percentage of the original cost. How to Calculate ROI Here's a detailed explanation of how to calculate ROI for your marketing investment. Return on Investment ROI is the measurement of common profitability ratio. A restaurant may bundesliga experten tipps a few good years but then lose its clientele and go out of business. This ROI calculator return on investment calculates an annualized rate of return using exact dates. Or you can click on "Today" to quickly select the current date.