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Blended and paid CAC side by side — the gap between them is the number that matters.
Blended CAC divides all your spend by all your customers. It is the friendliest number and the least actionable — it improves whenever organic grows, which tells you nothing about whether your paid channels work.
Organic, referral, word of mouth
Use the same month for spend and for customers, or the ratio is meaningless. If your sales cycle is long, lag the customer count to match when the spend actually happened.
Blended CAC is $231 but each paid customer really costs $370 once the team is included. Fund growth decisions on the loaded figure, not the blended one.
| Version | Formula | What it answers |
|---|---|---|
| Blended | All S&M spend ÷ all new customers | What growth costs on average |
| Paid | Ad spend ÷ customers from ads | Is the channel working? |
| Paid, loaded | All S&M spend ÷ customers from ads | What paid growth truly costs |
The loaded paid figure is the one to fund decisions on. It asks what an additional paid customer costs once the team running the channel is included — which is the actual question when someone proposes raising the budget.
Blended CAC falls when organic grows, which feels like efficiency and is not. If half your customers arrive through word of mouth, blended CAC is roughly half the loaded paid figure — and the moment organic plateaus, blended CAC climbs toward the paid number without a single thing having changed in your marketing.
Track both. Blended tells you what growth costs today; paid tells you what the next customer will cost.
GOOD QUESTIONS
All sales and marketing costs for the period: ad spend, salaries and commission, tools, agencies and creative. Exclude product and engineering, and exclude customer success work on existing accounts — that is retention, not acquisition.
There is no absolute answer. CAC is only meaningful against LTV and against payback period. A $2,000 CAC is excellent for a $500/month enterprise product and fatal for a $20/month consumer one.
Both, for different questions. Blended tells you what growth costs on average today. Paid tells you what the next bought customer costs, which is the number that should drive budget decisions.
Substantially. If it takes three months to close, this month's customers came from spend three months ago. Comparing same-period spend and customers produces a number that swings with timing rather than performance.