Free CPA and cost-per-action calculator
Calculate spend per defined action and keep leads, purchases and customers distinct.
Try your own numbers.
The starting values are illustrative. Replace them with compatible numbers from your report.
Use this calculator for a clearly named action such as a completed enquiry or purchase. Enter the spend and count from a compatible report. Calling the result customer acquisition cost requires a customer denominator, not just any event labelled as a conversion.
Work through it, step by step.
Define the action in plain language before entering a number. Check whether the measurement counts a completed outcome or an earlier interaction.
Enter spend and actions from the same period and scope. Allow for delayed outcomes when choosing the window.
Interpret the result alongside action volume and quality. Keep different action types in separate comparisons.
Make it concrete.
If 900 in spend produces 30 completed enquiries, the result is 30 per enquiry. It says nothing by itself about how many enquiries became qualified customers.
What to keep in mind.
With zero actions, cost per action is undefined. Reporting zero would misleadingly imply that outcomes were acquired at no cost.
Your next useful step.
Use the conversion-actions guide to verify the denominator. Investigate a meaningful cost increase through measurement, traffic intent and the destination experience.
Working with this in Liftaven
Calculations run locally in your browser. These tools do not connect accounts or send your inputs to Liftaven. Use numbers from the same reporting period and keep currencies consistent. A calculated ratio describes your inputs; it does not establish the cause of a change.
Explore the workspaceSources & context
This note combines original practical guidance with the reporting references below. Follow provider documentation for current definitions and availability; suggested investigations are not guarantees of a particular result.