CAC payback formula
CAC payback months = CAC / monthly gross profit per customer
Monthly gross profit per customer usually equals ARPA multiplied by gross margin. If churn is high, payback must be faster to protect cash flow.
What is a good CAC payback period?
Many SaaS teams prefer payback under 12 months, but acceptable payback depends on cash reserves, growth rate, retention, margins, and funding stage.
How to improve CAC payback
Increase conversion rate, reduce acquisition cost, raise ARPA, improve gross margin, or target segments with stronger retention.