What is Customer Lifetime Value (CLV)?
Customer Lifetime Value (CLV or LTV) is the total profit a firm expects from a customer over the entire relationship. Simple formula: CLV = (Average Revenue per Period × Gross Margin × Average Lifetime) − Acquisition Cost. More sophisticated formulas discount future cash flows (NPV approach), incorporate retention probability per period, and segment by cohort. CLV matters because it sets the rational ceiling on customer acquisition cost (CAC) — a customer worth $500 in CLV cannot be acquired for $600 without losing money. The LTV/CAC ratio is the most-watched metric in modern marketing — best-in-class SaaS targets 3:1 or higher; subscription consumer brands target 4:1+. CLV varies enormously by segment — heavy users may be worth 10x light users.
How Customer Lifetime Value (CLV) actually works
The framework breaks down into the following moving parts. Knowing what each piece is — and what it is not — is what separates a B-grade answer from an A-grade answer in a written assignment.
- Simple: CLV = (ARPU × margin × lifetime) − CAC
- NPV: discount future cash flows
- Segment-level: different CLV per cohort/segment
- LTV/CAC ratio target: 3:1+ (SaaS) to 4:1+ (consumer subscription)
- Heavy users often 10x light users in CLV
A worked example: Netflix
Netflix's CLV per subscriber is roughly $300-500 over the average 4-5 year subscription life (at $15.49/month and ~70% gross margin after content cost). At a CAC of $50-80 (heavy in Year 1), Netflix's LTV/CAC ratio of 4-5x supports continued acquisition spending. The CLV calculation also drives content investment — original shows that increase retention by even 5% generate millions in CLV across the subscriber base. Netflix's ability to spend $15B+ annually on content makes economic sense only if you understand the CLV impact. Without the CLV lens, the spend looks irrational; with it, the math works.
Don't lose marks for these
- Calculating CLV before retention curves are stable
- Ignoring discount rate (CLV is NPV)
- Using average CLV when segment variation is huge
How to use this on the exam
Score-maximizing moves
- Show simple and NPV formulas
- Cite LTV/CAC target ratios
- Apply to a real subscription business
When to use Customer Lifetime Value (CLV) (and when not to)
Use Customer Lifetime Value (CLV) when your assignment asks you to analyze, structure, or recommend — and when you have at least two data points to populate every cell of the framework. Skip it when the question is asking for a numerical answer or a single recommendation, since Customer Lifetime Value (CLV) is a structuring tool, not a calculator.