How to calculate blended CAC
Blended CAC gives the simplest, most complete view of acquisition cost by dividing all spend across all new customers. It is the right number for overall unit economics and board reporting.
Its blind spot is that free organic customers pull the average down, which can mask an inefficient paid engine. That is why blended CAC should sit beside paid CAC, not replace it.
- All spend / all customers The formula
- Includes organic The whole picture
- Can hide paid weakness The blind spot
Short answer
Blended CAC is your all-in cost to acquire a customer across every channel. Divide total sales and marketing spend by all new customers won in the period, including those from organic and referral. If you spent 300,000 dollars and won 100 customers, blended CAC is 3,000 dollars. It reflects overall efficiency but can hide weak paid channels.
Step by step
Total all sales and marketing spend
Sum every acquisition cost: paid media, salaries and commissions, tools, agencies, events, and content. Use a fully loaded number.
Count all new customers
Count every new customer won in the period, regardless of channel, including organic and referral.
Divide spend by customers
Blended CAC equals total spend divided by all new customers. It is the average across every channel.
Compare to paid CAC
Compute paid CAC separately (paid spend over paid-acquired customers). A wide gap means organic is carrying growth, which matters when you try to scale paid.
Worked example
You spent 400,000 dollars total and won 120 new customers: 80 from paid channels (on 350,000 dollars of paid spend) and 40 from organic.
Blended CAC = 400,000 / 120 = 3,333 dollars. Paid CAC = 350,000 / 80 = 4,375 dollars. The blended number looks efficient, but paid CAC reveals that scaling paid acquisition costs over 30 percent more per customer than the blended figure suggests.
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 blended CAC formula?
Total sales and marketing spend divided by all new customers won in the period, including organic and referral. Use a fully loaded spend figure that includes salaries and tools, not just media cost.
What is the difference between blended and paid CAC?
Blended CAC includes all customers and spend, so free organic wins pull it down. Paid CAC counts only paid spend and paid-acquired customers, so it is higher and reveals the true cost of paid acquisition.
When should I use blended CAC?
For overall unit economics and board reporting, where the all-in cost matters. But pair it with paid CAC before making scaling decisions, since blended CAC can hide an inefficient paid engine behind free organic customers.