Metrics
CAC Payback
Quick definition
Number of months to recover CAC from gross profit.
CAC Payback = CAC / (MRR × Gross Margin). Measured in months. Best-in-class SaaS is under 12 months; under 18 is healthy; over 24 is a red flag.
Related metrics terms
ARR (Annual Recurring Revenue)
Annualized value of your subscription revenue at a point in time.
MRR (Monthly Recurring Revenue)
Monthly equivalent of ARR, useful for month-over-month tracking.
Net Revenue Retention (NRR)
Revenue from your existing customer base 12 months later, including expansion and churn.
Gross Revenue Retention (GRR)
NRR without upsell — what you keep before expansion.
Frequently asked questions
- What is CAC Payback?
- CAC Payback = CAC / (MRR × Gross Margin). Measured in months. Best-in-class SaaS is under 12 months; under 18 is healthy; over 24 is a red flag.
- Why is CAC Payback important for startups?
- CAC Payback is a metrics concept that matters for startup founders because it directly affects fundraising readiness, financial decision-making, or operational discipline at the stage where mistakes are expensive to undo. Founders who understand it have a meaningfully easier time in diligence, board meetings, and investor conversations.
- What category does CAC Payback belong to?
- CAC Payback is a Metrics term in the StartupCFO finance glossary — alongside other metrics concepts that founders, CFOs, and accountants use in daily startup operations and reporting.
- Where can I learn more about CAC Payback?
- Beyond this definition, see the related metrics terms below, or explore StartupCFO's insights and tools that put CAC Payback in context. For specific situations, talk to a fractional CFO who can walk through your numbers.
Got a finance question that needs more than a definition?
Talk to a real CFO. 30 minutes, no contract, free.
