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Blended CAC

What it costs you to win a customer on average across every channel — including the free ones — which is why it always looks kinder than the paid-only figure.

In plain English

Blended CAC spreads your total sales and marketing spend across all the customers you won — the ones you paid for through ads and the ones who showed up for free via word of mouth, SEO or referrals. Because those organic customers cost almost nothing but still count in the total, blended CAC comes out lower than what you actually pay to buy an additional customer. That makes it a flattering headline metric, but a dangerous one to scale on: when you turn up the ad budget, you're buying more paid customers, and paid CAC is the number that tells you what that really costs.

The formula

Blended CAC = Total sales & marketing spend ÷ ALL new customers (incl. organic)
Paid CAC = Paid spend ÷ customers from paid channels only

The gap between the two numbers is, in effect, the size of the free lunch your organic channels are giving you — and the more it shrinks, the more your real acquisition cost is rising.

A worked example

In a quarter you spend €60k total on sales and marketing and win 80 new customers — but only 40 of them came from paid channels, on €50k of ad spend. The other 40 arrived organically.

Blended CAC = €60k ÷ 80 = €750
Paid CAC = €50k ÷ 40 = €1,250

Blended says €750, but every extra customer your ads buy actually costs €1,250. If you budgeted to scale on the €750 figure, your payback math would be off by two-thirds.

What's a good blended CAC?

There's no single "good" blended CAC — the useful exercise is contrasting it against paid CAC to see which number you should trust for which decision:

MetricUse it forVerdict
Blended CACTracking overall efficiency & board reportingContext, not decisions
Paid CACDeciding how much more to spend on adsThe honest scaling number
Blended ≈ Paid CACSignals organic is weak — paid is doing all the workWatch payback closely

When blended and paid CAC drift apart, organic is carrying you; when they converge, your paid channels are bearing the full load — and that's exactly when efficiency matters most.

Frequently asked questions

What's the difference between blended CAC and paid CAC?
Blended CAC divides total sales and marketing spend by every new customer, including those who arrived free through organic channels. Paid CAC divides only paid spend by only the customers paid channels brought in. Blended is always the lower, friendlier number; paid CAC is the honest cost of buying an extra customer.
Which CAC should you scale decisions on?
Paid CAC. When you raise ad budget you're buying more paid customers, not more organic ones, so the marginal cost is what your paid channels charge. Blended CAC flatters you when organic is strong and can hide rising paid costs, leading you to scale spend that no longer pays back.
Why does blended CAC look so good when organic is strong?
Organic customers cost little or nothing but still sit in the denominator of blended CAC, dragging the average down. A wave of word of mouth or SEO can make blended CAC look excellent even while paid channels get more expensive — which is why it can mislead on its own.

CAC · CAC payback period · LTV:CAC ratio · Trial-to-paid conversion rate

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The complete guide to value-based bidding · Value-based bidding without a data team

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