What CAC Is and How to Calculate Yours in Under a Minute
CAC stands for Customer Acquisition Cost. In short, it's how much it costs, on average, to win a new customer, adding up everything you spent to get there, not just the ad spend itself.
CAC = Total marketing and sales spend ÷ Number of new customers
Example: $4,000 spent in a month ÷ 20 new customers = CAC of $200 per customer
Notice the math isn't just "how much did I spend on Google Ads" or "how much did I spend on Meta Ads." To do it properly, you'd also add sales commissions, tools, and even the time of whoever manages it, if you want to be strict about it. But just adding up your ad spend already gives you a far better picture than tracking nothing at all.
The problem is most business owners look at clicks or followers and never get to this number. The result: a lot of businesses have no idea whether they're paying $50 or $500 for each new customer walking through the door.
Why Customer Acquisition Got More Expensive in 2026
If your ads feel like they're delivering less for the same budget, it's not in your head. Two concrete things are driving that up in 2026.
The first is structural: more and more businesses are advertising on Google and Meta, and those platforms run on an auction. The more advertisers competing for the same space, the higher the price, that simple. Industry analysts have been tracking this climb since 2022.
The second is more recent and specific to Brazil, where IKOEH is based: starting January 1, 2026, Meta began passing local taxes on to Brazilian advertisers that it previously absorbed itself, making Instagram and Facebook ads there up to 12.15% more expensive.
In practice, every R$1,000 (Brazilian reais) spent on ads now shows up as more than R$1,100 on the invoice. Google Ads hasn't announced a similar change there so far. It's a Brazil-specific example, but it points to a broader pattern worth watching wherever you advertise: platforms increasingly passing their own costs on to advertisers, on top of auctions that are already getting more competitive.
Combine a pricier auction with costs being passed through, and whatever your CAC was a year or two ago isn't a reliable benchmark anymore. If you're not recalculating it, you risk thinking a campaign is doing fine when it's actually costing you more than it looks.
CAC on Its Own Doesn't Tell You Much: What to Track Alongside It
Knowing your CAC by itself doesn't say much. What actually matters is the relationship between your CAC and how much that customer brings back over time, known as LTV (Lifetime Value).
A common rule of thumb is that LTV should be at least 3 times your CAC for the business to be healthy long term. If you spend $200 to win a customer and they bring you $600 over the time they stay with you, the math works. If they only bring you $220, you're right at the edge, and any hiccup can push you into the red.
This also explains why a high CAC isn't automatically bad. A clinic with a high ticket and loyal patients can comfortably support a CAC of $300. A low-ticket, one-time-purchase business needs a much leaner CAC to make sense.
This is where real paid ads management earns its keep: it's not just about turning an ad on, it's about tracking this number month over month and adjusting targeting, creative, and landing pages to keep CAC under control even as the auction gets pricier.
At IKOEH, we track this number alongside you, with clear reporting and no fluff, plus lifetime post-sale support. If your CAC has gone up and you're not sure exactly why, get in touch.
Frequently asked questions
What counts as a good CAC?
There's no universal number. What matters is the relationship between your CAC and your LTV (how much the customer brings in over time). A common benchmark is LTV being at least 3 times your CAC.
Is a high CAC always a problem?
Not necessarily. Businesses with a high ticket and loyal customers, like clinics and consulting firms, can sustain a higher CAC. The real problem is when CAC rises and nobody is tracking whether the return still makes sense.
How do I lower CAC without cutting my ad budget?
By improving audience targeting, ad creative, and the landing page. Those three things, adjusted carefully, usually bring CAC down faster than simply spending less.