ROI

ROI stands for return on investment and describes the ratio of profit to capital deployed. Unlike ROAS, which only measures revenue per euro of ad spend, ROI takes all costs into account and compares them to the actual profit. This makes it the more honest efficiency metric for an individual activity or an entire project.

How ROI is calculated

The basic formula is profit divided by capital deployed, expressed as a percentage. An ROI of 25 percent means that 100 euros of investment produced 25 euros of profit. The requirement is sound cost accounting that lists direct and indirect costs cleanly. Anyone who only counts media spend ignores staff, tooling, technology and discount effects and arrives at a flattered number.

Where ROI makes sense

ROI is useful for strategic decisions, for example when comparing channels, tools or entire business areas across longer periods. For day to day performance marketing it is often too slow, here ROAS delivers faster steering signals. Used together both metrics reveal whether growth is actually profitable.

Practical relevance in everyday marketing

A strong ROAS on a mailing or an ad is worthless if no profit remains after all costs are deducted. Responsible owners should regularly translate ad spend into an overall ROI that also includes production, tooling and staff. Only then is it clear whether the invested resources actually create value rather than just activity.