Are Customers Worth More Than They Cost? (LTV:CAC)

Why this matters

The CAC:LTV ratio is the single most common health check in growth reviews because it collapses two critical metrics into one signal: are we acquiring customers for less than they are worth? A ratio below 1:1 means every customer destroys money by definition. The 3:1 benchmark widely cited in SaaS is a starting point, not a law — understanding why it exists and when to deviate is what separates analytical builders from cargo-cult operators.

Demo

LTV:CAC ≥ 3:1 is the widely cited benchmark for a healthy paid acquisition channel in SaaS. Consumer e-commerce often operates at lower ratios due to higher margins on repeat purchases.

Try it yourself

1. Build a table with five LTV:CAC values (0.8, 1.5, 2.5, 3.0, 5.0) and label each as 'unsustainable', 'marginal', 'borderline', 'healthy', or 'potentially under-investing'.
2. Research the LTV:CAC ratios disclosed by three public SaaS companies in their S-1 or investor day materials and compare them to the 3:1 benchmark.
3. Compute what CAC must fall to (or LTV must rise to) to move a 2:1 ratio to 3:1 — express both as percentage changes.
4. Find one e-commerce brand case study where a sub-3:1 LTV:CAC was profitable due to repeat-purchase contribution margin, and write two sentences explaining why the benchmark does not apply there.

References

• https://www.forentrepreneurs.com/saas-metrics-2/
• https://a16z.com/16-metrics/