CPA / CAC Calculator

What is CAC? Customer Acquisition Cost (CAC) is the total cost — across ad spend, agency fees, tooling, team time, and creative — to acquire one new customer. It is distinct from CPA (Cost Per Acquisition), which is the simpler ad-spend-divided-by-conversions number every ad platform reports. CPA is a lie of omission; it ignores every other cost involved in acquiring a customer — the agency managing your account, the analytics tools tracking your data, the team members spending hours optimizing campaigns, and the creative assets that make those ads work.

True CAC (Customer Acquisition Cost) includes all of these expenses. For a typical DTC brand spending $25K per month on ads with an agency, software stack, and part-time team allocation, the true CAC can be 30 to 60 percent higher than what Meta or Google reports as your CPA. That gap matters enormously when you are making scaling decisions based on profitability.

This calculator reveals the full picture by letting you input every cost category that contributes to customer acquisition. The result shows your platform-reported CPA alongside your true fully-loaded CAC, the dollar gap per customer, and the percentage by which your platform is underreporting. If your breakeven ROAS targets are based on platform CPA rather than true CAC, you may already be scaling into losses without knowing it.

Run this calculation monthly to ensure your profitability assumptions reflect reality. Pair it with the LTV:CAC calculator to understand whether your true acquisition cost is justified by customer lifetime value.