Decide ad scale
Raise budget if CAC is under the profitable threshold.
What is CAC (customer acquisition cost)?
CAC (Customer Acquisition Cost) measures how much it costs on average to acquire a new paying customer in a period. Usual formula: acquisition spend (media, sales, tools, marketing production) ÷ number of new customers. CAC only makes sense next to LTV (lifetime value) and margin—not in isolation.
In one sentence
CAC tells you how much you pay, on average, to win a new customer.
Key points
- Include all relevant costs or document exclusions.
- Separate paid, organic, and blended CAC when possible.
- Compare CAC to LTV (and payback period).
- A lower CAC that worsens customer quality is a false win.
Term at a glance
- CAC
- customer acquisition cost · acquisition cost · cost to acquire a customer
- English term
- Customer Acquisition Cost
- Domain
- Marketing / finance
- Category
- Unit economics
- Level
- Intermediate
What does CAC mean?
CAC aggregates cost to get a customer, not merely a lead. Confusing CPL with CAC skews scale decisions.
SaaS often tracks CAC payback in months; local commerce compares first-purchase cost vs average ticket.
Performance frameworks stress defined formulas and scopes—apply the same rigor to marketing CAC.
How do you calculate and steer CAC?
- 01
Define “customer”
First payment, signed contract, or delivered order—keep it stable.
- 02
Sum costs
Ads + acquisition salaries + tools + agency in the period.
- 03
Divide
Costs ÷ new customers in the same period (watch lag).
- 04
Compare to LTV
Common aim: LTV clearly above CAC (ratios vary by sector).
A concrete example
A private clinic spends CA$12,000/month (ads + coordination) and gains 40 new paying patients → CAC = CA$300. With estimated LTV of CA$1,800, the ratio stays healthy.
What is CAC for?
Compare channels
SEO vs Meta vs Google CAC.
Pricing
Check margins can absorb acquisition.
Leadership reporting
Show growth efficiency.
Pros and cons
- Clear finance language
- Steers scale
- Comparable over time
- Links marketing to customers
- Disputed cost scope
- Timing lag
- Ignores quality mix
- Hard in multi-touch
CAC vs CPL
| CAC | CPL (cost per lead) | |
|---|---|---|
| Unit | Paying customer | Lead / prospect |
| Funnel stage | Bottom | Top / mid |
| Use | Acquisition profitability | Lead-gen campaign steering |
| Risk | Understates if poorly defined | Ignores closing |
Why CAC matters for Quebec SMEs
Scaling without knowing CAC burns cash. Linking CAC and LTV avoids “winning customers” that destroy margin.
FAQ
Include sales salaries?
For full-funnel CAC, yes; otherwise label “media-only CAC.”
Organic CAC?
Allocate content/SEO pro rata or track blended CAC.
Good LTV:CAC?
SaaS often aims >3:1; adapt to your margins and cash.
By channel?
Yes for allocation; also keep a global CAC.
Cohorts?
Compute by acquisition month to spot drift.
Related terms
Sources and references
Opaque or rising CAC? Let’s clarify formula, channels, and breakeven.
Clarify CAC