Acquisition cost walkthrough

Customer Acquisition Cost Example: What Should Be Included?

An online school is reviewing a six-week enrollment campaign. The ad platform reports an attractive cost per signup, but advertising is only one part of the work required to acquire paying students. This example builds marketing and sales cost separately before calculating blended CAC.

Practical example15 min read

Rebuild the complete campaign cost stack

CourseCraft sells cohort-based professional courses. During one campaign, paid ads cost $18,000, campaign-specific writing and design cost $4,500, attribution and email tools cost $1,500, and allocated marketing payroll cost $6,000. Marketing therefore contributed $30,000 to acquisition.

Sales added $9,000 of allocated payroll, $3,000 of commissions, and $2,000 for demo support and campaign-specific contractor work. These $14,000 of sales costs bring total acquisition cost to $44,000. Finance confirms 160 people became new paying customers during the same attribution period.

The point is not that every company must use these exact labels. It is that costs should enter based on whether they supported acquiring the counted customers. The denominator must include new customers only, not leads, trial registrations, renewals, or the entire active customer base.

What we’re calculating

Marketing plus sales cost per new customer

Blended CAC = (Marketing costs + Sales costs) ÷ New customers acquired

Marketing costs
$30,000 across ads, creative, tools, and allocated payroll.
Sales costs
$14,000 across payroll, commissions, and other attributable work.
New customers
160 first-time paying students tied to the campaign period.

The calculator also reports each cost group per customer and its share of total acquisition cost.

Intermediate calculations, step by step

  1. Assemble marketing cost

    $18,000 + $4,500 + $1,500 + $6,000 = $30,000.

  2. Assemble sales cost

    $9,000 + $3,000 + $2,000 = $14,000.

  3. Match the denominator

    Count 160 new paying customers acquired by the activity—not 640 leads or existing renewals.

  4. Calculate the components

    Marketing cost per customer = $30,000 ÷ 160 = $187.50; sales cost = $14,000 ÷ 160 = $87.50.

  5. Calculate blended CAC

    ($30,000 + $14,000) ÷ 160 = $275 per new customer.

Worked example

A six-week online-school enrollment campaign

All cost allocations and new-customer counts refer to the same campaign window and attribution rule. Revenue and customer value are deliberately evaluated after CAC rather than subtracted inside it.

Advertising
$18,000
Other marketing
$12,000
Sales costs
$14,000
New customers
160
  1. Total acquisition cost = $30,000 marketing + $14,000 sales = $44,000.
  2. Marketing cost/customer = $187.50; sales cost/customer = $87.50.
  3. Blended CAC = $44,000 ÷ 160 = $275.
  4. Ad-spend-only shortcut = $18,000 ÷ 160 = $112.50; marketing share = 68.18%; sales share = 31.82%.
Result$275 blended CAC = $187.50 marketing + $87.50 sales per new customer

Each acquired customer required $275 of combined marketing and sales resources under this allocation. The number is not automatically good or bad. It must be compared with gross profit contribution, collection timing, retention, capacity, and the school’s objectives.

Comparison: the ad-spend-only shortcut

Dividing $18,000 of ads by 160 customers produces $112.50. That arithmetic is correct for advertising spend per acquired customer, but it is not complete blended CAC. It omits $26,000 of creative, tools, marketing payroll, sales payroll, commissions, and other acquisition work.

The shortcut understates the complete result by $162.50 per customer, or 59.09%. Across 160 customers, the missing amount is the full $26,000 omitted cost stack. Calling $112.50 CAC could lead the school to scale a campaign whose staffing and sales requirements were never budgeted.

  • Ads only: $112.50 per customer.
  • Complete marketing: $187.50 per customer.
  • Marketing + sales: $275 blended CAC.

What the owner should notice

Marketing is the larger cost group, but sales still adds nearly one-third of total acquisition spending. If management looks only at ad dashboards, the work after a lead arrives disappears. The component results show where to investigate without pretending every dollar can be optimized independently.

CAC is sensitive to attribution. If some of the 160 customers would have enrolled organically, assigning all of them to the campaign could understate paid acquisition cost. Conversely, using only immediate conversions might exclude customers created by the campaign who purchase later. The school needs a stable, documented rule.

Alternative scenario: more customers without more payroll

If the same $44,000 cost stack acquires 200 new customers, blended CAC becomes $220, marketing cost per customer becomes $150, and sales cost per customer becomes $70. That improvement comes from spreading the same campaign resources across 40 more acquisitions.

This is a scenario, not a promise of scale. Additional volume may require more support, commissions, sales hours, or discounts. Before adopting $220 as a plan, management should confirm which costs remain fixed within the new range and which would rise.

Included versus excluded by purpose

Include when attributable to acquisition

  • Campaign media and creative production.
  • Marketing and sales tools used in the period.
  • Allocated team payroll and commissions.
  • Other work required to turn prospects into new customers.

Do not mix into this denominator

  • Customer success cost for existing students.
  • Renewal revenue or existing customers counted as new.
  • General product development unrelated to acquisition.
  • Costs and customers from different periods.

Common mistakes

Where the calculation goes wrong

Using leads as customers

CAC divides by acquired customers. Leads that never pay do not belong in the denominator.

Counting ads only

Ad spend per customer is a useful component, but omitting people, creative, tools, and sales work understates blended CAC.

Mixing periods

A quarterly payroll allocation divided by one week of customers distorts the result.

Inventing a universal target

A viable CAC depends on customer gross profit, timing, retention, capacity, and strategy; there is no context-free good number.

Action checklist

Before you use the result

  • Define the acquisition and attribution period.
  • List advertising, creative, tools, and marketing payroll.
  • List sales payroll, commissions, and other attributable costs.
  • Count only new paying customers on the same basis.
  • Review marketing, sales, and blended cost per customer.
  • Compare CAC with customer economics and cash timing—not a fabricated benchmark.

FAQ

Questions beyond the basic calculation

Should free-trial users count as acquired customers?

Only if the business intentionally defines acquisition that way. For a paying-customer CAC, count customers who begin paying. Mixing trial signups with paying customers makes comparisons unreliable.

How should shared payroll be allocated?

Use a documented, repeatable basis such as time spent on the campaign or acquisition function. Precision is less important than a reasonable method applied consistently and reviewed when roles change.

Should discounts be added to CAC?

A discount usually reduces revenue rather than becoming a marketing cash cost, but it still affects customer economics. Keep CAC aligned with the calculator’s marketing-and-sales inputs and account for discounts when comparing CAC with gross profit.

Can the school compare CAC with CLV?

Yes, provided CLV is defined consistently—preferably from gross profit—and both metrics reflect comparable customer groups and periods. The relationship is business-specific, so this example does not prescribe a universal ideal ratio.

Note: This example is educational and does not establish a standard CAC for online education. Attribution, accounting policy, customer value, and operating capacity differ by business.