eCPC is effective cost per click in online advertising. While CPC is the actual price paid for each click, eCPC is a calculated metric which tells you what the CPC would have been if you were buying clicks rather than impressions, CPM's, or actions. To calculate eCPC the formula is written as:
eCPC = Total cost oOf an ad / Total number of clicks received
Again, in the world of publishing, eCPC is a useful measure for comparing metrics,using a nearly identical formula.
eCPC = Total earnings from ads / Total number of clicks received