Glossary — metrics
CAC payback period
Also known as: CAC payback · payback period
CAC payback period is the number of months it takes to recover the cost of acquiring a customer through their gross-margin contribution.
How it works
Payback = CAC / (ARPU × Gross Margin). A 12-month payback means a company recovers its CAC in a year. Best-in-class SaaS companies have payback under 12 months; under 18 months is acceptable; over 24 months suggests structural problems. Payback ties directly to burn — companies with long paybacks need more capital to grow.