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Metric

Customer Acquisition Cost (CAC)

Customer Acquisition Cost is the aggregate sales and marketing cost required to acquire one net new customer within a specific period.

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Also CAC, Cost to acquire a customer, cacMarketing Refs Editorial, reviewed by Marketing Refs Review DeskAnalytics & Measurement3 sources

Formula

CAC = Sales & Marketing Spend / Number of New Customers
Numerator
The primary counted outcome or cost used in Customer Acquisition Cost (CAC).
Denominator
The population, event count or time period used to normalize Customer Acquisition Cost (CAC).
Reporting window
The date range used consistently across inputs.

Worked example

If sales and marketing spend is $120,000 in a quarter and that quarter produces 600 new customers, CAC is $200. Keep paid media, sales cost and attribution rules consistent before comparing periods.

CAC has no universal good number. Evaluate it against LTV, CAC payback period, gross margin, ACV, sales cycle length and acquisition mix for the same business model.

How it works

CAC measures the cost required to add one new customer and is a core unit-economics metric for SaaS, ecommerce and paid acquisition teams.

Key takeaways

  • Use Customer Acquisition Cost (CAC) when the decision depends on metrics, attribution, experiments and financial accountability.
  • Pair Customer Acquisition Cost (CAC) with related concepts before changing strategy, budget or execution.

Where it is used

  • Forecasting
  • Budget allocation
  • Performance diagnosis

Used by Marketing teams · Growth teams · Students

Examples

  • A growth team reviews Customer Acquisition Cost (CAC) by cohort so acquisition, conversion and retention decisions use the same reporting window.
  • A channel owner compares Customer Acquisition Cost (CAC) against related metrics before changing budget, creative or funnel priorities.

Common mistakes

  • Comparing Customer Acquisition Cost (CAC) across channels without matching the reporting window.
  • Optimizing Customer Acquisition Cost (CAC) alone without checking downstream quality or customer value.

Questions

What is Customer Acquisition Cost (CAC)?
Customer Acquisition Cost is the aggregate sales and marketing cost required to acquire one net new customer within a specific period.
How do you calculate Customer Acquisition Cost (CAC)?
Calculate Customer Acquisition Cost (CAC) with a consistent reporting window, clear inputs and enough context from adjacent metrics before making budget or strategy decisions.
What is a practical example of Customer Acquisition Cost (CAC)?
A growth team reviews Customer Acquisition Cost (CAC) by cohort so acquisition, conversion and retention decisions use the same reporting window.

Sources

NextCAC vs CPA

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