Marketing & Advertising
Customer Acquisition Payback Calculator
Calculate acquisition investment, first-month gross profit, simple payback, retained gross profit through the selected horizon, net value, and return on acquisition investment. The cohort curve shows accumulated contribution against the recovery line rather than presenting payback as an isolated number.
Expected payback period-
Acquisition and onboarding investment-
First-month gross profit-
Expected gross profit through horizon-
Gross profit less acquisition investment-
Horizon return on acquisition investment-
Decision view
Retained-cohort acquisition payback
Retained-cohort acquisition paybackAccumulated gross-profit contribution is compared with acquisition investment across the selected horizon.
Exact scenario comparisonMonthly churn rate (%) changes while all other entered assumptions remain constant.
| Monthly churn rate (%) | Expected payback period | Acquisition and onboarding investment | First-month gross profit | Expected gross profit through horizon | Gross profit less acquisition investment | Horizon return on acquisition investment |
|---|
How to use Customer Acquisition Payback Calculator
- Use fully loaded acquisition and onboarding cash for a comparable customer cohort.
- Enter recurring revenue and gross margin after direct service costs, not accounting gross margin from an unrelated report.
- Compare the crossing point with cash runway, contract term, retention evidence, and required return.
Calculator guide
Understanding Customer Acquisition Payback Calculator
Customer acquisition payback asks how long retained gross profit takes to recover acquisition and onboarding cash. Revenue alone cannot repay acquisition cost; the relevant monthly contribution is revenue multiplied by gross margin and reduced as the modeled cohort churns.
Calculation method
How the calculation works
Accumulate margin-adjusted monthly revenue while applying the entered churn rate until acquisition and onboarding cost are recovered. Add acquisition and onboarding cost, calculate monthly gross profit, reduce the active cohort by the entered churn rate each month, accumulate contribution, and identify the first recovery crossing.
Unit-economics review
Separate payback quality from acquisition volume
A growing channel can still consume cash when recovery is slow.
Worked situations
Practical examples
- A $600 acquisition cost plus $100 onboarding cost creates a $700 recovery target.
- $120 monthly revenue at 80% gross margin contributes $96 before churn in the first month.
- At 2% monthly churn, later months contribute less, so retained-cohort payback is longer than cost divided by first-month contribution.
Better inputs
Useful tips
- Calculate CAC consistently across sales, marketing, incentives, and implementation labor.
- Use cohort-specific churn rather than blending customers with different tenure.
- Review payback with lifetime contribution and cash timing; a short payback does not guarantee attractive scale.
Before relying on the result
Limitations and common mistakes
- The model treats revenue, margin, and churn as constant apart from cohort decay.
- Expansion, contraction, reactivation, refunds, bad debt, support-cost changes, discounting, and acquisition-capacity limits are excluded.
- Payback may remain unreached inside the selected horizon.
Reference
Key terms
- CAC
- Acquisition cost allocated to one newly acquired customer.
- Onboarding cost
- Incremental implementation cost incurred after acquisition.
- Gross-profit contribution
- Revenue remaining after the entered direct-cost margin.
- Payback
- First modeled time accumulated contribution recovers acquisition investment.
Important note
Calculated from the entered campaign values. Validate attribution, incrementality, lag, margin, and observed source data before making decisions.
Frequently asked questions
Why use gross profit instead of revenue?
Only the portion remaining after direct costs is available to recover acquisition spending.
What if payback is longer than the horizon?
The page shows the unrecovered position; extend the horizon only when retention evidence supports it.
Should salaries be included in CAC?
Include the sales and marketing costs required by the measurement policy being used, and apply that policy consistently.
Is a lower payback always better?
Usually for cash efficiency, but growth capacity, retention, market size, and long-term value still matter.