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CAC Payback Period Calculator

Estimate how many months of customer gross profit are required to recover the cost of acquiring that customer.

Enter your assumptions

Use one period and currency consistently. Change any value to recalculate.

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Results

Estimate based on the assumptions shown.

Instant estimate

What this calculator measures

CAC payback divides acquisition cost by monthly gross profit per customer. A shorter result generally means acquisition cash is recovered sooner, but the metric should be read alongside churn, working capital and the timing of actual collections.

The calculator assumes monthly revenue and gross margin remain stable during the payback window. Annual prepayment can improve cash timing without changing the underlying gross-profit economics, so do not confuse cash collection with earned payback.

How to use the CAC Payback Period Calculator

  1. Enter customer acquisition cost using a consistent cost scope.
  2. Enter monthly revenue per customer and gross margin.
  3. Compare payback months with expected customer lifetime and cash runway.
Payback months = CAC ÷ (monthly ARPU × gross margin)

Monthly gross profit applies the entered gross-margin percentage to monthly revenue per customer.

Worked example

A $1,200 CAC with $200 monthly ARPU and 80% gross margin produces $160 monthly gross profit and a 7.5-month payback period.

Assumptions and limitations

  • The calculation assumes stable revenue and margin during payback.
  • It does not model churn before acquisition cost is recovered.
  • Sales commissions and onboarding must be included in CAC when material.
  • Cash-flow timing can differ from recognized revenue and gross profit.

Related calculators

Customer Acquisition Cost CalculatorMeasure the blended sales and marketing cost required to acquire one new customer during a consistent period.Customer Lifetime Value CalculatorEstimate simple gross-profit LTV from monthly revenue, gross margin and customer churn, with an optional CAC comparison.Customer Churn CalculatorSeparate gross customer churn from net customer growth so newly acquired accounts do not hide losses in the starting cohort.MRR and ARR CalculatorNormalize recurring subscription revenue into MRR and ARR without mixing in one-time services or unearned contract value.