What is Blended CAC?
Blended CAC (Blended Customer Acquisition Cost) divides total customer-acquisition spend — paid + organic + brand + partnership — by total new customers in a period. It is the “all-in” CAC metric most often quoted in pitch decks and used in headline LTV:CAC ratios. Blended CAC is simpler than separating Paid CAC and Organic CAC — but masks important channel-mix information.
The formula
Blended CAC = (Paid Marketing + Organic Content/SEO + Brand/PR + Sales Salaries Allocated to Acquisition) ÷ Total New Customers. The “allocation” question matters enormously: should you include 100% of sales-team comp, or just net-new outreach? Modern SaaS norms use 50-100% of new-business AE comp plus 100% of paid spend plus content investments amortised over 12 months.
Why VCs scrutinise the paid/organic mix
Two companies with identical blended CAC of USD 600 can have very different scaling profiles: 90% paid means CAC rises sharply as the company scales (paid channels saturate); 50/50 paid/organic means the company has built durable acquisition channels that will absorb growth at a lower marginal CAC. Sophisticated VCs ask for the paid/organic breakdown precisely because blended hides this signal.
Top-quartile blended CAC benchmarks
For B2B SaaS at Series A-B stage, top-quartile blended CAC payback periods sit at 12-18 months — meaning the company recovers blended CAC within that window through ARR contribution. Companies above 24 months payback typically face investor scrutiny on either pricing power or channel efficiency. For e-commerce and consumer SaaS, the benchmark drops to 6-12 months because of faster monetisation cycles.
The “LTV : Blended CAC” ratio
The famous 3:1 LTV:CAC heuristic typically uses blended CAC as denominator. A 3:1 ratio means lifetime value is 3× the cost to acquire — generally considered healthy. Top SaaS companies target 5:1+. Below 2:1, the unit economics rarely justify aggressive growth investment.
Related: Paid CAC, Organic CAC, Contribution Margin, Hockey Stick Growth.