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Customer Analytics

Customer Acquisition Cost (CAC)

Customer Acquisition Cost measures the marketing cost required to acquire one new customer under the workbook’s simple formula. A broader company definition may also include sales payroll, tools, agencies, and allocated overhead, but that scope must be stated explicitly.

Business context

Why Customer Acquisition Cost matters

A lower CAC can indicate more efficient acquisition, while a higher CAC may reflect cost inflation, weaker conversion, or investment in harder-to-reach segments.

Business question
How much marketing spend did we use for each new customer acquired?
Teams that use it
Marketing, finance, growth, sales operations, and leadership teams.
Decisions it supports
Channel budgets, campaign mix, payback analysis, growth pacing, and acquisition efficiency.
Calculation

Customer Acquisition Cost formula

Total Marketing Spend ÷ New Customers Acquired

Formula components

Total marketing spend
Campaign and marketing costs included under the company’s documented CAC scope.
New customers acquired
Distinct customers whose acquisition is attributed to that spend and period.
Attribution window
The time allowed between marketing activity and customer conversion.

How to calculate Customer Acquisition Cost

  1. Set the period, channels, and cost categories included in marketing spend.
  2. Calculate spend for that exact scope.
  3. Count newly acquired customers using the same attribution rules.
  4. Divide spend by new customers and document whether the result is blended or channel-specific.
Worked example

Customer Acquisition Cost example

A company spends £96,000 on acquisition marketing during a quarter and attributes 600 new customers to that activity.

  1. Total marketing spend = £96,000.
  2. New customers acquired = 600.
  3. CAC = £96,000 ÷ 600 = £160.

Customer Acquisition Cost is £160 per new customer.

Under this marketing-only definition, the business spent £160 for each attributed new customer. A fully loaded CAC would be higher if sales and overhead costs were added.

How to interpret the result

Review CAC beside customer value, margin, and payback timing. A low acquisition cost is not automatically attractive if the acquired customers churn quickly or generate little margin.

CAC varies widely by channel, market, sales motion, attribution model, and company maturity. Keep the cost scope and attribution window stable before comparing periods.

Common mistakes and limitations

Cost scope drift
Adding sales salaries in one month but not another makes the series inconsistent.
Period mismatch
Spend today may produce customers after the reporting period.
Double-counted customers
Multi-touch attribution can credit the same customer to several channels.
Ignoring customer quality
CAC alone does not show retention, revenue, margin, or payback.
Customer Lifetime Value (CLV) Average revenue generated per customer over their lifetime. Churn Rate Percentage of customers lost during a specific period. Customer Retention Rate Percentage of customers retained over a specific time period. Average Revenue Per User (ARPU) Revenue generated per user on average during a specific time period.

Turn metric definitions into answers your team can use.

Vizma helps teams understand and track business metrics using their data. Bring your Customer Acquisition Cost definition, underlying data, and reporting questions to a Vizma demo.

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