Ep 2: CPM, eCPM, RPM: which number pays you

Your dashboard shows three prices. Which one actually pays your bills?

CPM is the price buyers pay per thousand ad impressions.

Take recipes.example. One thousand page views, three ad slots on each page. Say two thousand four hundred impressions fill, at a two dollar CPM. That earns four dollars eighty. eCPM, effective CPM, is what you actually earned per thousand impressions, across every buyer. Four eighty over two thousand four hundred, times a thousand. Two dollars. Now RPM, revenue per thousand page views. Four eighty over one thousand page views, times a thousand. Four dollars eighty. RPM bakes in how many ads each page shows and how many fill. So it’s the number that tracks what your traffic earns.

Track page RPM week to week. When it moves, check CPM and fill to see which one changed.

Next, fill rate. The inventory nobody bought.