Blended CAC
MetricBlended CAC is the total acquisition spend across all marketing channels divided by the total number of new customers acquired in the same period.
What is Blended CAC, in plain English?
Blended CAC is the "real-world" cost of acquiring a customer. If you open your bank account and see you spent $10,000 on marketing in May, and your CRM shows 200 brand-new customers placed an order in May, your Blended CAC is $50 per customer — simple, honest, and impossible to fake with ad platform tricks.
How do you calculate Blended CAC?
Blended CAC = Total Acquisition Spend ÷ Total New Customers Acquired
Blended CAC example
You spend $15,000 on paid ads and acquire 300 new customers across all channels (including word-of-mouth and organic search). Blended CAC = $15,000 ÷ 300 = $50 per customer.
Common Blended CAC mistakes
Ad platforms will always claim a lower "Channel CAC" than your Blended CAC because they don't see other ads the customer saw. CFOs and investors care about Blended CAC because it reconciles directly with bank cash outflow.
What is a good Blended CAC?
Judge blended CAC against what a new customer is worth: it should sit comfortably below the gross profit a customer generates within your payback horizon. Compare it month over month on one fixed definition of 'new customer', and watch it next to channel CAC — a widening gap usually means platforms are double-claiming customers.
Blended CAC FAQs
What is the difference between blended CAC and channel CAC?
Blended CAC divides all acquisition spend by all new customers, whichever channel gets the credit. Channel CAC uses one channel's spend and the customers that channel claims. Because platforms can claim the same customer, channel CACs usually look lower than blended CAC.
Should blended CAC include organic customers?
Yes — that is what blending means: all spend over all new customers, so customers from organic search and word of mouth pull it down. That makes blended CAC flattering when organic is strong; pair it with paid CAC (paid spend ÷ customers from paid) when you need to judge ad efficiency on its own.
How often should I calculate blended CAC?
Monthly is the usual cadence, using spend and new customers from the same calendar month. Weekly figures are noisy because of conversion lag. Count first-time customers from your own order data, not from platform-reported conversions.
- Blended CAC vs. Channel CAC — Which One Goes to the Board?
- New vs. Returning Customer ROAS, and Why Blended Hides an Acquisition Problem
- What “How did you hear about us?” is really for
- Payback Period vs. LTV:CAC — Which One Actually Gates Your Ad Budget
- Retargeting steals credit from prospecting (and how to prove it)
- CPA vs CAC vs CPP: stop mixing them in one deck
Last reviewed October 3, 2026.