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NumLuma› Business›CAC
Business · calculator Business Profit & Pricing Calculators ↗

Customer Acquisition Cost Calculator

Calculate customer acquisition cost from acquisition spending and new customers. Use consistent spend and customer periods for a meaningful CAC.

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Customer acquisition cost Live result
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Calculation breakdown
How to read this result

Use the result to compare scenarios and verify the inputs, units and real-world conditions before making an important decision.

More actions
Useful next calculationCustomer LTV
How to use it

A clear result in a few inputs.

  1. Enter the requested values.Use consistent units and the real values for your scenario.
  2. Read the main result and breakdown.NumLuma recalculates immediately when an input changes.
  3. Check the formula and assumptions.Use the supporting context before making a real-world decision.

What this calculator does

Customer acquisition cost divides the spending used to acquire customers by the number of new customers attributed to that spending. The arithmetic is simple; the important part is keeping the numerator and denominator aligned to the same period and acquisition scope.

What to know before you use the result

  • CAC = acquisition spend ÷ new customers.
  • Use new customers, not all active customers.
  • Define whether acquisition spend includes only media or also sales, agency and marketing costs.

Common mistakes to avoid

  • Dividing one quarter's spend by customers acquired in a different period.
  • Mixing new and returning customers.
  • Comparing CAC values built from different definitions of acquisition spend.
NLNumLuma standard

Built to be understandable before it is impressive.

  • Formula shown clearly
  • No sign-up required
  • Mobile-first controls
  • Inputs processed locally
  • Plain-language result breakdown
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Assumptions & scope

Know what the number includes.

Commercial business intent. Define the metric precisely and distinguish it from neighboring metrics to avoid thin or interchangeable pages.

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Quick answers

About the cac calculation.

What costs belong in CAC?

That depends on your reporting definition. Some teams use media spend only; others include broader sales and marketing costs. Consistency matters most for comparison.

Is CAC the same as CPA?

Not always. CPA can describe the cost of any conversion action, while CAC specifically refers to acquiring a new customer.

How does CAC relate to LTV?

CAC measures acquisition cost; customer lifetime value estimates the value generated over the customer relationship. They are often reviewed together but are separate calculations.

Can CAC be calculated by channel?

Yes, if both spending and new-customer attribution can be isolated to the same channel.