What is a good LTV:CAC ratio for SaaS?
Short answer
3:1 is the folklore answer; the truth is more nuanced. Healthy ranges are 2:1 to 8:1+ depending on stage, motion, and payback period. Anything under 1:1 means you're losing money on every customer.
The 3:1 rule comes from David Skok's 2010-era SaaS posts. It works as a sanity check but breaks at the extremes. PLG companies with very low CAC routinely run 8:1+. Enterprise companies with 18-month sales cycles can be healthy at 2:1.
Payback period is the more honest pair metric. Under 12 months is healthy for most SaaS, under 6 months is PLG-tier, under 18–24 months is acceptable for true enterprise.
| Segment | Low | Typical | High |
|---|---|---|---|
| Pre-PMF / experimental | <1:1 | 1.5:1 | 3:1 |
| Early-stage SMB SaaS | 2:1 | 3:1 | 5:1 |
| Mature PLG / horizontal SaaS | 4:1 | 6:1 | 10:1+ |
| Enterprise / sales-led | 1.5:1 | 3:1 | 5:1 |
Caveats
- Always use gross-margin-adjusted LTV. Top-line LTV inflates the ratio by 1.2–2× and lies to you.
- LTV needs at least 18 months of churn data to be reliable. Before that, it's a forecast, not a measurement.
- Paid CAC alone (excluding content, brand, salaries) makes the ratio look much better than fully-loaded CAC.