Free marketing calculator · Customer economics
CLV:CAC Ratio Calculator
Compare customer lifetime value with customer acquisition cost to see how much estimated customer value is generated for every pound spent acquiring a customer.
The ratio is a useful summary of customer economics, but it should be read alongside cash payback, margin assumptions and the quality of the lifetime-value estimate.
What is the CLV:CAC ratio?
CLV:CAC compares the estimated lifetime value of a customer with the average cost of acquiring that customer. It answers a straightforward question: how much lifetime value does the business expect to generate for each unit of acquisition cost?
Example: contribution CLV of £360 and CAC of £60 gives a CLV:CAC ratio of 6x.
Use contribution CLV where possible
A revenue-based CLV:CAC ratio can look impressive while ignoring the variable costs required to serve the customer. Contribution CLV is often more decision-useful because it estimates the value remaining after variable costs before comparing that value with acquisition cost.
That does not make the ratio a complete profit measure: overheads, financing, retention investment, refunds, tax and other costs may still sit outside the model.
What does a target ratio mean?
Teams sometimes use a target such as 3x as a planning guardrail. That is not a universal law. The right threshold depends on cash constraints, payback speed, gross or contribution margin, repeat purchase behaviour, business model and the uncertainty in the CLV estimate.
A very high ratio is not automatically evidence that acquisition is optimised either. It can mean customer economics are excellent, but it may also suggest the business could invest more aggressively in growth if the additional customers remain equally valuable.
Why payback matters as well
Two businesses can have the same CLV:CAC ratio and very different cash profiles. If one recovers CAC in three months and the other takes two years, the funding requirement and risk are different. That is why the broader customer-economics view includes CAC payback as well as the lifetime ratio.
Model the full customer economics
The Customer Economics Calculator connects CAC, revenue CLV, contribution CLV, CLV:CAC, CAC payback, lifetime contribution after CAC and maximum sustainable CAC.
CLV:CAC calculator FAQs
What is a good CLV:CAC ratio?
There is no universal threshold. A commonly discussed planning target such as 3x may be useful in some businesses, but the appropriate level depends on margin, payback, cash availability, retention and how confidently CLV can be estimated.
Should I use revenue CLV or contribution CLV?
Contribution CLV is usually more useful for acquisition decisions because it allows for variable costs. Revenue CLV can still be useful as a top-line customer-value measure if the basis is clearly labelled.
Can a high ratio be misleading?
Yes. CLV is an estimate of future behaviour. If retention, purchase frequency or margin assumptions are too optimistic, the ratio will also be too optimistic.