How do you calculate CAC?

Divide total sales and marketing cost for a period by the number of new customers acquired in that period.

There is no universal number — CAC is only meaningful versus lifetime value (often targeted at 3:1 LTV:CAC or better) and payback period.

What is the difference between blended and paid CAC?

Blended CAC includes all wins (even organic); paid CAC isolates the cost of a specific paid channel.

Growth Marketing Glossary

Customer Acquisition Cost

/ˈkəstəməɹ ˌækwəˈzɪʃən kɔst/noun (initialism: CAC)

What it costs, all-in, to win one new customer — the price side of every growth decision.

Schematic — spend per acquired customer

Term: Customer Acquisition Cost
Abbreviation: CAC (said "C-A-C" or "kak")
Part of speech: Noun
Field: Growth Economics

Forms & parts of speech

customer acquisition cost · noun

The all-in cost to acquire one new customer.

"Paid customer acquisition cost doubled, so we leaned harder on referrals."

CAC · noun (initialism)

The common shorthand for the metric.

"Our blended CAC is $180; on paid social alone it's closer to $300."

Definition in plain terms

Customer acquisition cost is what you spend, on average, to win one new customer — total sales and marketing cost divided by the number of customers that spending produced. It is the price tag on growth, and it only means something next to what a customer is worth (lifetime value) and how long they take to pay you back.

The mechanics

Add up the sales and marketing costs for a period — ad spend, salaries, tools, agency fees — and divide by the new customers acquired in that period. "Blended" CAC includes everything (even organic and word-of-mouth wins); "paid" CAC isolates what a given channel actually costs. The honest version counts the fully-loaded cost, not just media spend.

When it matters

CAC is half of the central equation of growth economics. A business is healthy when a customer's lifetime value comfortably exceeds CAC (a common rule of thumb is LTV at least 3× CAC) and when the payback period is short enough to fund the next cohort. Rising CAC with flat value is the classic warning that a growth model is quietly breaking.

Worked example. A company spends $50,000 on sales and marketing in a quarter and acquires 250 customers. CAC = $50,000 ÷ 250 = $200. If each customer is worth $900 in lifetime value, the LTV:CAC ratio is 4.5× — healthy. If a new channel pushes CAC to $400 for the same value, the ratio falls to 2.25× and the economics tighten fast.

Failure modes to watch. Reporting media-only CAC and hiding the salaries, tools, and agency fees that make it far higher; mixing organic wins into "paid" CAC to flatter it; and optimizing CAC in isolation without checking lifetime value and payback — cheap customers who never repay are worse than expensive ones who do.

Formula

CAC = Total sales & marketing cost ÷ New customers acquiredUse the fully-loaded cost for the period. Pair with LTV:CAC ratio and CAC payback period to judge whether the economics work.

Benchmarks

CAC has no universal benchmark — it is only meaningful relative to lifetime value and payback period for your specific model.

There is no universal "good" CAC

It only means something vs. LTV

Healthy LTV:CAC ratio

~3× or higher (rule of thumb)

CAC payback period

Often targeted under ~12 months

Calculators

CAC calculators →

Ranges are illustrative; every published figure is cited from a named public source or labelled “RGM analysis.”

Synonyms & antonyms

Synonyms

acquisition costcost per acquisition (CPA, loosely)cost to acquire

Usage trends

Search interest for this term over the last five years:

View interest-over-time on Google Trends →

Common questions

How do you calculate CAC?: Divide total sales and marketing cost for a period by the number of new customers acquired in that period.
What is a good CAC?: There is no universal number — CAC is only meaningful versus lifetime value (often targeted at 3:1 LTV:CAC or better) and payback period.
What is the difference between blended and paid CAC?: Blended CAC includes all wins (even organic); paid CAC isolates the cost of a specific paid channel.

Related tools & calculators

Resources & people to follow

bookLean Analytics — Croll & Yoskovitz (unit economics)
thought leaderBrian Balfour (Reforge) — growth & acquisition models
thought leaderDavid Skok (For Entrepreneurs) — SaaS metrics & CAC

Curated, non-competitor resources verified per term.

Related training

moduleGrowth marketing foundations
moduleDTC growth — acquisition economics
moduleMarketing analytics

Disciplines

Areas of marketing where customer acquisition cost is a core concern:

Performance marketingDTC growthMarketing analytics

Sources

trendsGoogle Trends — "customer acquisition cost"