Customer Acquisition Cost (CAC)
CAC is total acquisition spend divided by new customers acquired: the efficiency measure of how much it costs to add one paying customer.
Common questions
Common questions
- What is Customer Acquisition Cost (CAC)?
- CAC is the total cost of acquiring one new customer: total acquisition spend (advertising, sales, agency fees, headcount) divided by the number of new customers in the same period. It measures how efficiently your marketing converts spend into customers.
- What costs should be included in a CAC calculation?
- A full-stack CAC includes advertising costs, agency or freelancer fees, internal headcount costs attributable to acquisition, tool subscriptions, and any onboarding or sales costs. Using only ad spend understates the true CAC and produces misleadingly efficient numbers.
- What is the difference between blended CAC and channel CAC?
- Blended CAC averages acquisition cost across all channels and all customers. Channel CAC breaks this down by source (Google, Meta, LinkedIn, etc.). Channel CAC is more actionable because it reveals which channels are becoming more or less efficient and where the next acquisition dollar should go.
CAC is one of the two fundamental variables in any growth business (the other being LTV). It measures the efficiency of your customer acquisition: how much you spend per new customer. On its own, it says nothing about whether a business is healthy: a $500 CAC is excellent if your average customer generates $5,000; it is unsustainable if they generate $300.
The most common CAC calculation error is using only ad spend in the numerator. Full-stack CAC includes advertising costs, agency or freelancer fees, internal headcount costs attributable to acquisition, tool subscriptions, and any onboarding costs. Partial CAC calculations produce a number that looks more efficient than reality. The gap between reported CAC and true CAC is often where businesses find they were growing faster than they were building value.
CAC also varies significantly by channel. The blended CAC (total acquisition cost divided by total new customers) hides the efficiency differences between channels. Channel-level CAC, tracked over time as channels mature, is more actionable: it shows you which channels are becoming more or less efficient and where the next dollar of acquisition spend should go.
Example
A B2B SaaS company reports a $180 blended CAC. A channel-level breakdown shows Google Search at $120, Meta prospecting at $310, and LinkedIn at $490. The blended number masks a 4x spread. With LTV data showing that LinkedIn-sourced customers have 2.3x the LTV of Google Search customers, the reallocation decision becomes a question of payback period, not just CAC.
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