CAC Payback Period vs LTV to CAC Ratio
What is the difference between CAC Payback Period and LTV to CAC Ratio? Side-by-side definitions, formulas, and benchmarks for two of the most-watched SaaS metrics.
Definitions
What is CAC Payback Period?
CAC Payback Period measures how long it takes to recover customer acquisition cost from customer revenue or gross margin.
Full CAC Payback Period definition →
What is LTV to CAC Ratio?
LTV to CAC Ratio compares customer lifetime value against customer acquisition cost to evaluate acquisition efficiency.
CAC Payback Period vs LTV to CAC Ratio at a Glance
| CAC Payback Period | LTV to CAC Ratio | |
|---|---|---|
| Category | Metrics | Metrics |
| Formula | CAC Payback Period = CAC / (Monthly ARPA × Gross Margin) | LTV:CAC Ratio = LTV / CAC |
| Benchmarks | target: 6–12 Months | good: 3 x; great: 6 x |
| Calculator | CAC Payback Period calculator | LTV to CAC Ratio calculator |
When Each Matters
CAC Payback Period and LTV to CAC Ratio answer different questions. CAC Payback Period measures how long it takes to recover customer acquisition cost from customer revenue or gross margin. LTV to CAC Ratio compares customer lifetime value against customer acquisition cost to evaluate acquisition efficiency. In practice, healthy SaaS operators watch both, because each one catches failure modes the other misses.