The predicted economic contribution of a relationship over the full time it lasts. Marketing and finance teams usually express it as expected revenue or gross profit from a buyer, subscriber, or account, then compare that figure with what it cost to win the relationship.
When the relationship is a paying customer, the same idea is published here as Customer Lifetime Value (CLV). Subscriber and patient variants exist in the same family. The letters themselves name the horizon (the lifetime), not the persona.
How LTV Is Calculated
Simple models multiply average spend by how long the relationship is expected to last. A common marketing form is:
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- Average revenue per period: Order value, subscription invoice, or account spend in a month or year. Average Order Value (AOV) and Average Revenue Per User (ARPU) often supply this input.
- Gross margin: The share of that revenue left after cost of goods or cost to serve. Using revenue alone overstates the cash a relationship actually produces.
- Expected periods: Inverse of churn when churn is stable (for example, 1 / monthly churn). Customer Retention Rate (CRR) and Net Revenue Retention (NRR) refine how long, and how much, existing revenue continues.
Finance-grade models discount each period’s contribution so money received years from now is not treated as equal to money received today. Those models also subtract ongoing service cost, not only the one-time Cost of Acquiring Customer (CAC).
LTV Compared With Adjacent Metrics
| Metric | What It Measures | Typical Use |
| LTV | Value of a relationship over its full duration | Payback ceilings, cohort health, unit economics |
| CLV | The same idea scoped to a customer | CRM, lifecycle, and retention programs |
| CAC | Cost to win one new relationship | Compared with LTV as an LTV:CAC ratio |
| AOV | Revenue in a single purchase | A building block, not a lifetime total |
| ARPU | Revenue per user in a period | A building block for subscription LTV |
Using LTV in Acquisition and Retention
Teams treat LTV as a budget constraint, not a vanity number. If it costs more to acquire a relationship than that relationship will return, growth destroys cash even when Return on Investment (ROI) on a single campaign looks healthy.
- Acquisition ceiling: A common rule of thumb is to keep CAC well below LTV (often a 3:1 LTV:CAC target in subscription businesses). The ratio only holds if both sides use the same margin definition and the same time window.
- Payback period: Months of gross profit needed to recover CAC. High LTV with a long payback still strains cash.
- Retention spend: Small lifts in retention compound LTV more than equivalent lifts in top-of-funnel volume, because they extend the period count in the formula.
- Cohorts, not averages: Blended LTV hides that one channel or segment may never pay back. Calculate by acquisition source, plan, and start month.
A worked marketing-model calculator is on Martech Zone’s Customer Lifetime Value Calculator.
