CAC Payback Period Calculator
Calculate how many months until a customer pays back their acquisition cost through repeat purchases. Track LTV:CAC ratio health.
Formula
What is CAC Payback Period?
CAC payback period measures how many months it takes to recover the cost of acquiring a customer. If it costs $50 to acquire a customer and they generate $25 in gross profit per month, your payback period is 2 months.
This metric is critical because it determines how fast you can reinvest in growth. A short payback period means you recover ad spend quickly and can scale aggressively. A long payback period means your cash is tied up waiting for customers to become profitable.
CAC Payback Benchmarks
- Excellent: Under 3 months — very efficient acquisition, fast cash recovery
- Good: 3-6 months — healthy for most e-commerce businesses
- Acceptable: 6-12 months — viable if customer lifetime value is high (subscriptions, repeat purchases)
- Concerning: 12+ months — may indicate unsustainable acquisition costs or low repeat purchase rates
Subscription businesses can tolerate longer payback periods (6-12 months) because recurring revenue is predictable. One-time purchase businesses need faster payback (under 3 months).