CAC Payback Period
Number of months to recover the cost of acquiring a customer through their recurring revenue
What is CAC Payback Period?
Customer acquisition cost (CAC) payback period is the number of months it takes to earn back the cost of winning a customer from that customer's gross profit. It shows how quickly growth spending pays for itself.
A shorter payback means faster recovery of cash, which lets a business grow with less funding.
How this KPI is measured
- Function
- Customer Success & Service
- Sub-function
- Unit Economics
- Industry
- All Industries
- Type
- Lagging
- Impact
- Financial control
- Unit
- months
- Measurement frequency
- Quarterly
- Formula
- CAC / (MRR per customer × Gross margin %)
How to calculate it
Divide customer acquisition cost by the monthly recurring revenue per customer multiplied by gross margin percentage.
For example, with CAC of 6,000, monthly recurring revenue per customer of 1,000 and a gross margin of 80%, payback is 6,000 / (1,000 x 0.8) = 7.5 months.
Use consistent CAC and margin definitions, and calculate by segment and channel, since payback often varies widely.
Where it is used
Judging growth efficiency
See how fast spend is recovered.
Managing cash
Plan funding for growth.
Comparing channels and segments
Choose the best.
How to improve it
Tips and common mistakes
- Payback assumes customers stay. Check churn.
- Compare with your cash position.
- Use segments, not just the blended average.
More Customer Success & Service kpi library
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