Measuring the impact of content marketing should not be too complicated for most businesses.
A content marketing return on investment (ROI) formula simply is:
Divide the cost of the Content Marketing by the number of Goals completed, to give a Cost Per Acquisition. In other words:
Content Marketing cost / Goals completed = Cost Per Acquisition
However, where it becomes complex is that many businesses (especially smaller businesses):
a) Don’t really know how much their content marketing costs
b) Have not specified goals (such as revenue generated or number of leads)
c) Have not / cannot implemented tracking, so do not know when a goal has been completed
d) Are not sure how much an Acquisition is worth
These reasons are why, although calculating content marketing ROI should not be complex, it often appears to be so.