Blended CAC

What is Blended CAC?

Blended CAC divides your entire sales and marketing spend by every new customer won in the period, paid and organic alike, so it reflects what growth actually costs the business rather than what any single ad platform reports.

The formula and a worked example

Blended CAC = total sales and marketing spend ÷ all new customers (paid, organic, referral, and brand) in the same period. Work an example with round, illustrative numbers. A telehealth brand spends $60,000 in a month across ads, tools, and agency fees, and signs 200 patients from paid plus another 100 from organic search, email, and referral. Paid CAC reads $60,000 ÷ 200 = $300, but blended CAC is $60,000 ÷ 300 = $200, because the organic patients carried no incremental media cost. The larger the organic engine, the further blended CAC sits below paid CAC.

Blended CAC vs paid CAC

Read the two together. Blended CAC flatters paid performance by folding in “free” customers, so a brand can watch blended hold steady while paid economics quietly break underneath it. The gap between them is itself the signal: across AdBoost Health partner accounts, blended CAC typically runs 30–50% below paid CAC once an organic engine (SEO, email, referral) is compounding, and if blended drifts up toward paid, the organic engine is stalling even while platform dashboards look stable.

The trap: never optimize campaigns to blended CAC

Blended CAC is a reporting and budgeting number, not a bidding target. Because it credits paid spend with organic and brand customers it never bought, steering individual campaigns toward a blended goal quietly rewards ad sets that ride existing demand (branded search, warm retargeting) and starves the cold prospecting that actually feeds the organic engine in the first place. Set campaign targets on paid CAC or POAS, and reserve blended CAC for the question it answers well: how much the whole business can afford to spend next month.

Why it matters for health and DTC brands

Blended CAC is the number to underwrite the P&L against, because it is closest to what the bank account actually shows. Judge it against your vertical rather than a universal figure: across AdBoost Health partner accounts, blended CAC lands around $150–350 for GLP-1, $80–180 for hair and dermatology, and $40–110 for subscription supplements (illustrative ranges, not guarantees). A blended CAC well above your vertical band, even with healthy platform ROAS, usually points at the intake flow, where a large share of ad clickers are lost before checkout. Pair blended CAC with LTV:CAC to confirm the model clears the standard 3:1 bar, and with marketing efficiency ratio (MER) for the whole-account efficiency view. Run your own with the CAC calculator.

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