CAC
Customer Acquisition Cost (CAC) is acquisition spend divided by new customers acquired. Here's the formula, healthy ranges by vertical, and how to read CAC against LTV.
CAC (Customer Acquisition Cost)
CAC is the total cost of acquiring a new customer — all acquisition spend divided by the number of new customers won.
Customer Acquisition Cost (CAC) is the blended cost of turning a stranger into a first-time buyer. You add up everything you spent to acquire customers in a period — paid media, agency fees, the salaries of the people running acquisition, affiliate payouts, creative production — and divide by the count of new customers in that same window.
CAC is the denominator of nearly every CFO conversation about marketing efficiency. On its own the number is meaningless; it only earns context when you compare it to the lifetime value (LTV) of the customers you bought. The rule of thumb most healthy online stores target is an LTV-to-CAC ratio of at least 3:1, with CAC fully recovered inside 12 months.
Most teams track two flavours: blended CAC (all acquisition spend across every channel divided by all new customers) and paid CAC (paid media only, divided by attributed new customers). Blended is the honest number your finance team trusts. Paid CAC is the number your media buyer optimises against.
CAC sits alongside AOV, repeat rate, and contribution margin in the core set of ecommerce metrics. It rises when iOS attribution gaps widen, when Meta CPMs spike in Q4, or when you outscale the audiences that actually convert — so trending it monthly matters more than the absolute value in any single week.
CAC = Total Acquisition Spend / New Customers Acquired
Total Acquisition Spend
Acquisition spend
All costs to acquire customers in the period: paid media, agency fees, acquisition team salaries, affiliate payouts, creative and landing-page production.
New Customers Acquired
New customers
Count of first-time paying customers in the same period. Exclude repeat orders and returning customers.
A Shopify apparel brand spends €48,000 on Meta and Google ads in October, plus €6,000 in agency fees and €6,000 in fully-loaded acquisition team salary. They acquire 1,200 new customers that month.
Paid media spend: €48,000
Agency fees: €6,000
Team cost: €6,000
New customers: 1,200
→ Blended CAC = €60,000 / 1,200 = €50
If the brand's 12-month LTV is €170, the LTV:CAC ratio is 3.4:1 — inside the healthy band. If LTV is only €110, the ratio is 2.2:1 and they're scaling unprofitably.
Healthy CAC varies enormously by vertical and average order value. A €25 supplement subscription cannot afford the same CAC as a €600 sofa. The table below gives realistic ballpark ranges by platform and vertical to anchor your own numbers — not targets to chase blindly.
Typical blended CAC ranges by vertical and AOV tier (online retail)
| Vertical | Typical AOV | Healthy CAC range | LTV:CAC target |
|---|---|---|---|
| Beauty & skincare | €40–€70 | €18–€35 | 3:1+ |
| Apparel & accessories | €60–€120 | €25–€55 | 3:1+ |
| Supplements (subscription) | €30–€50 | €20–€45 | 3.5:1+ |
| Home & furniture | €200–€800 | €80–€220 | 3:1+ |
| Consumer electronics | €100–€400 | €40–€120 | 3:1+ |
| Food & beverage (DTC) | €35–€60 | €15–€30 | 4:1+ |
Two warnings on benchmarks. First, blended CAC always looks better than paid CAC because organic, email, and referral pull the average down — make sure you're comparing like for like. Second, post-iOS 14 attribution gaps mean platform-reported CAC (what Meta tells you) is usually 20–40% lower than the true blended figure your bank account sees.
Frequently asked questions about CAC
CPA (cost per acquisition) is usually a platform-level metric for any conversion event — add-to-cart, lead, purchase. CAC specifically measures cost per new paying customer and includes overhead like salaries and agency fees that platform CPAs ignore.
Yes, for fully-loaded CAC. Include the salaries of anyone whose job is acquiring customers — performance marketers, paid social managers, the percentage of a creative team working on acquisition assets. Excluding them gives a flattering number your CFO won't trust.
3:1 is the widely-cited target: for every €1 you spend acquiring a customer, they should generate €3 in lifetime gross profit. Below 2:1 you're scaling unprofitably; above 5:1 you're probably under-investing in growth.
Blended CAC divides total acquisition spend by ALL new customers, including those who arrived via organic, email, or referral. Paid CAC only counts customers attributed to paid media. Blended is the truer business number; paid is what your media team optimises.
Monthly at minimum, with a rolling 90-day view to smooth out weekly noise. Look at CAC weekly only when you're stress-testing a major spend increase or a new channel — daily CAC is too volatile to act on.
Meta and other ad platforms over-attribute since iOS 14 — they claim credit for customers who would have converted anyway, or who saw multiple touchpoints. Blended CAC calculated from your bank statement and Shopify customer count is typically 20–40% higher than platform-reported CAC.
No. CAC measures the cost of acquiring NEW customers only. Spend that drives repeat purchases — retention email, loyalty programs, retargeting existing buyers — belongs in retention cost metrics, not CAC. Mixing them hides which side of the funnel is leaking.
How many months of gross profit per customer it takes to recover their acquisition cost. Healthy online stores target under 12 months; subscription brands often target 6 months because retention risk compounds. Longer payback means more cash tied up before each customer turns profitable.
Lift conversion rate at the same traffic cost. Faster checkout, better landing pages, on-site personalisation, and removing friction in the funnel all push more of your existing paid traffic into the new-customer column — which mathematically lowers CAC without touching media budget.
Almost never. Branded search CAC is usually a fraction of cold prospecting CAC. Breaking CAC out by channel — and by new-vs-returning intent within each channel — is the difference between a useful number and a vanity blended average.
Track CAC, channels, and funnel conversion in one place
Metricuno connects ad spend, funnel events, and revenue so you can see CAC by channel, cohort, and campaign — without stitching together five tools.