Customer lifetime value (CLV or LTV) is the total revenue a business expects to earn from a single customer over the full duration of their relationship. It's a foundational metric for customer-centric businesses because it quantifies the economic impact of retention, satisfaction, and experience quality.

CLV = Average revenue per customer × Average customer lifespan

More sophisticated models account for gross margin, discount rates, expansion revenue, and the probability of retention at each period. For subscription businesses, CLV is directly linked to churn rate: reducing monthly churn from 5% to 3% can nearly double CLV.

The connection to customer service is direct and measurable. Every customer service interaction is either building or eroding CLV:

• Positive resolution extends the customer relationship, increases likelihood of expansion, and generates referrals

• Poor experience accelerates churn, reduces expansion, and creates negative word-of-mouth

• Proactive service (catching and resolving issues before the customer contacts you) has the highest CLV impact because it signals the company is paying attention

For CX leaders, CLV reframes the cost conversation around customer service. When a CEO asks "why are we spending $X on support?", CLV provides the answer: because each resolved interaction protects $Y in future revenue. This is especially powerful when evaluating AI investments — if AI resolution improves CSAT and reduces churn, the CLV impact often exceeds the direct cost savings by an order of magnitude.

Related terms: customer churn rate, customer retention rate, cost per resolution