A simple example
A business compares the purchases made by customers during their first 12 months. That is observed 12-month value, not proof of what every customer will spend over a lifetime.
Start with observed cohorts
Group customers by a meaningful acquisition period or source, then measure their later orders over the same elapsed window. A mature cohort has had more time to repurchase than a recent one. Comparing both without that distinction can make the new cohort look worse simply because it is younger.
Revenue and contribution answer different questions
Revenue-based value describes customer spending. Contribution-based value accounts for the agreed variable costs and can be more useful for acquisition decisions. Document discounts, refunds, delivery costs and currency handling before using the result to set a budget.
Illustrative fixed-period example
A cohort of 100 customers produces £15,000 of net revenue over 12 months. Observed 12-month revenue per acquired customer is £150. This is an invented example, not a lifetime forecast. If those customers have not completed their relationship, calling £150 their final lifetime value would overstate what is known.
How to use the estimate responsibly
- Keep observed and forecast values separate.
- Compare cohorts at equal ages.
- State exclusions and identity limitations.
- Review value alongside CAC and time to recover acquisition cost.
- Use retention tests to investigate improvements, rather than assuming every repeat order was caused by email.
Use customer cohorts before optimistic forecasts
An average customer value can hide major differences between groups. Customers acquired through a deep discount may behave differently from customers buying a specialist product at full price. Compare cohorts over the same elapsed period before concluding that one group is more valuable. A recently acquired customer has had less time to return than someone acquired a year ago.
Distinguish revenue value from contribution value and observed history from a forecast. The version useful for a budget decision should reflect the costs and time horizon relevant to that decision. If repeat behaviour is uncertain, make the uncertainty visible rather than using a single confident number. Retention work can then focus on a plausible customer need, such as replenishment or helpful product education, and its performance can be reviewed against comparable cohorts. Sending more messages alone does not establish higher lifetime value.
- Group customers by acquisition period and compare matching observation windows.
- State whether value means revenue, gross margin or a defined contribution measure.
- Review repeat purchase, returns and communication costs before expanding investment.
Plan relevant retention activity →
Frequently asked questions
What is customer lifetime value?
Customer lifetime value (CLV or LTV) estimates value generated across a customer relationship. Specify whether the value is revenue or contribution, and distinguish observed value over a fixed period from a forecast of future behavior.
Is lifetime value always a forecast?
It can describe observed value over a defined period or a modelled future estimate. Label the method and assumptions so the two are not confused.
Is customer revenue the same as customer contribution?
No. Revenue does not account for all relevant costs. The business should define the contribution convention and review cohorts on that basis.
Sources and further reading
Primary material for the concepts discussed here. Our practical checklists and illustrative examples are editorial recommendations. Source links open in a new tab.