Blended CAC vs paid CAC
Both numbers describe acquisition cost, but they answer different questions. Blended CAC tells you the overall efficiency of the whole go-to-market. Paid CAC isolates whether your paid channels can stand on their own.
Founders sometimes quote blended CAC to look efficient because free organic customers drag the average down. That hides whether paid spend is actually working, which is what you need to know before scaling a budget.
Short answer
Blended CAC divides total sales and marketing spend by every new customer, including organic and referral. Paid CAC divides only paid spend by customers acquired through paid channels. Paid CAC is always higher and better reveals how efficient your paid acquisition truly is once you strip out free organic wins.
Key takeaways
- Blended CAC = all spend / all new customers (organic included).
- Paid CAC = paid spend only / customers from paid channels.
- Paid CAC is higher and exposes true channel efficiency.
- Scale decisions should lean on paid CAC, not blended.
When to use each
Use blended CAC for board-level unit economics and overall efficiency trends. Use paid CAC when deciding whether to increase spend on a specific channel, because it tells you the real marginal cost of the next customer from that channel.
A healthy business watches both: a widening gap between paid and blended CAC means organic is carrying the growth, which is great until you try to scale paid and CAC jumps.
How Ardovo handles it
Ardovo reports blended and per-channel paid CAC side by side from live spend and closed deals. Rook warns when paid CAC climbs while blended stays flat, the classic sign that organic is masking a paid-efficiency problem.
Frequently asked questions
What is the difference between blended and paid CAC?
Blended CAC includes all customers and all spend, including free organic wins. Paid CAC counts only paid spend and paid-acquired customers, so it is higher and shows the true cost of paid acquisition.
Which CAC should I report to investors?
Show both. Blended reflects overall efficiency, but sophisticated investors ask for paid CAC because it reveals whether growth can scale on paid channels or is quietly dependent on organic.
Why is paid CAC higher?
Because it excludes the free organic and referral customers that pull the blended average down. Paid CAC reflects only customers you paid to acquire, which is the real marginal cost.