Calculate the value of an extra impression
Set a CPM ceiling from the qualified outcomes you expect.
Use one consistent denominator
If 1,000 impressions produce eight paid link clicks and 5% of those clicks yield orders, the expectation is 0.4 orders per thousand impressions. A $35 acquisition ceiling supports at most $14 CPM under those assumptions.
Change one input before buying more
If click-to-order conversion falls to 2.5%, the ceiling falls to $7 CPM. Use placement-specific rates where possible, especially when different devices have very different landing performance.
Compare ceilings with actual outcomes
A CPM below the ceiling can still lose money if impressions are poorly matched to your audience or if the clicks do not reach the page. Track qualified actions and net contribution after spend.
Try a related tool
Calculate CPM, CPC, and click-through rate from the same media report.
