LTV/CAC Ratio
Name variants
- English
- LTV/CAC Ratio
- Kanji
- 比率
Quality / Updated / COI
- Quality
- Reviewed
- Updated
- Source
- Citations & Trust
- COI
- none
TL;DR
The LTV/CAC ratio compares lifetime value to acquisition cost and shows whether each new customer creates economic value.
Definition
LTV/CAC is calculated by dividing customer lifetime value by customer acquisition cost. A ratio above 1 indicates value creation, while very low ratios mean growth destroys value; extremely high ratios can also suggest under-investment in growth. The ratio is most useful when paired with payback period and retention quality.
Decision impact
- Determines whether to scale acquisition or pause to fix retention and margin.
- Guides channel allocation by comparing LTV/CAC across segments.
- Sets growth expectations and informs fundraising or cash planning.
Key takeaways
- Use margin-adjusted LTV to avoid overstating value.
- Compare the ratio by cohort and channel, not only in aggregate.
- A good ratio without fast payback can still strain cash.
- Improving retention or pricing often lifts the ratio more than cutting spend.
- Targets should match business model and growth stage rather than a universal number.
Misconceptions
- Any ratio above 3 is always good; payback speed and risk still matter.
- The ratio is static; it changes with churn, pricing, and channel mix.
- LTV/CAC replaces other metrics; it should complement unit economics and cash flow.
Worked example
A B2B SaaS has LTV of $900 and CAC of $300, giving a ratio of 3. But the payback period is 16 months, causing cash strain. The company introduces annual contracts and improves onboarding, reducing payback to 10 months while keeping LTV stable. With the faster payback, the team can safely increase acquisition spend.
Citations & Trust
- Principles of Marketing (OpenStax)