LTV:CAC Ratio Formula
LTV:CAC = LTV (with margin) / Customer Acquisition Cost
Benchmarks
| Ratio | Assessment |
|---|---|
| > 5× | Excellent — possibly underinvesting in growth |
| 3–5× | Healthy SaaS benchmark |
| 1–3× | Marginal — growth may not be sustainable |
| < 1× | Unprofitable — losing money on each customer |
The 3× benchmark (LTV = 3× CAC) is widely cited as the minimum threshold for a healthy SaaS growth model. It means you have at least 3× the CAC in margin to cover operations, R&D, and overhead.
What Drives a Low LTV:CAC Ratio?
- High churn: Customers don't stay long enough to generate sufficient LTV
- Low margins: Direct costs consume too much of revenue
- Expensive acquisition channels: High CPL on paid social, trade shows
- Low ARPU: Small contracts relative to sales cost
How to Improve LTV:CAC
Increase LTV: - Reduce churn (customer success, onboarding, feature stickiness) - Expand ARPU (upsells, add-ons, usage-based pricing) - Improve gross margin (infrastructure efficiency, pricing power)
Reduce CAC: - Invest in inbound/SEO channels (lower marginal CAC) - Shorten sales cycle - Improve trial-to-paid conversion rate
Use the LTV Calculator to model how changes in churn, ARPU, margin, and CAC affect your ratio.