KnowledgeCost per Acquisition / Action
CPA · How much advertising spend is needed for one recorded conversion.
Understand CPA in context.
Simply explained explanation
How much advertising spend is needed for one recorded conversion.
Professional explanation
Spend divided by attributed conversions for the selected primary action or action set.
Analytical explanation
Check whether the denominator counts qualified leads, purchases or soft events. CPA changes can reflect attribution and event setup, not just media performance.
Technical explanation
Google Ads Cost / conv. uses conversions from its configured reporting scope. An independent calculation is spend / conversions; some columns apply interaction eligibility.
Four complementary explanations — choose your level. Technical definitions are platform-specific where noted.
↗ How to use it
Break down by conversion action and validated outcome.
⚠ Common interpretation mistake
A low CPA is meaningless if the tracked action has little business value.
Metric calculator
Adjust the inputs to see how the metric is calculated.