Customer Acquisition Cost

What Is CAC?

CAC (Customer Acquisition Cost) is the total cost to acquire a new customer. Unlike CPA, which often means the cost of one conversion in an ad platform, CAC should include the full cost of marketing and sales: ads, creatives, tools, agency fees, affiliate commissions, and sometimes first-order discounts. Formula: total acquisition cost / number of new customers.

In 2026, acquisition cost must be treated carefully because platforms are more expensive and competitive. Meta reported 3.56 billion Family Daily Active People, a 19% increase in ad impressions, and a 12% increase in average price per ad year over year for Q1 2026 (source: https://www.prnewswire.com/news-releases/meta-reports-first-quarter-2026-results-302757852.html). Shopify reports average ecommerce conversion rates around 2.5-3% (source: https://www.shopify.com/blog/cro-statistics). CAC therefore depends not only on ads, but also on page quality, offer, and trust.

Example: in one month you spend 24,000 PLN on Meta Ads, 3,000 PLN on UGC creatives, 800 PLN on tools, and 2,200 PLN on a landing page freelancer. Total cost is 30,000 PLN. You acquire 600 new customers. CAC is 50 PLN. If you look only at Meta and see 40 PLN CPA, you understate cost by 10 PLN per customer. Across 600 customers, that is a 6,000 PLN difference in profitability.

An operator should calculate CAC separately for new customers and returning customers. A retargeting campaign may have low purchase cost, but it often closes demand created earlier rather than acquiring new customers. For scaling, watch blended CAC: all acquisition costs divided by new customers in the period.

Good CAC is not a fixed number. For a product with 40 PLN margin, 45 PLN CAC is bad. For a product with 90 PLN margin and proven repeat purchase, 60 PLN CAC can be excellent. The decision always depends on margin, AOV, LTV, and cash flow. If CAC grows faster than AOV or LTV, scaling only accelerates the loss.

Calculate CAC in three versions. Platform CAC shows what Meta, TikTok, or Google reports. Blended CAC shows all marketing costs divided by new customers. Payback CAC shows how many days it takes for customer margin to repay acquisition cost. For a small store, payback matters most because cash runs out faster than LTV theory. If payback takes 120 days while suppliers and ads must be paid now, growth can kill the company despite positive LTV.

The common trap is excluding creative cost from CAC. If you buy UGC, editing, graphics, and AI tools every week, those are not generic overhead without acquisition impact. They exist because campaigns need fuel. Add them to blended CAC at least monthly. Only then can you see whether a channel truly scales or whether you are moving cost outside the ad dashboard.