Customer Lifetime Value (CLV or LTV) is the total net revenue a single customer is expected to generate from their first purchase until they churn or stop buying. It is the foundational unit economics number that tells you how much a customer is actually worth to the business.
At a glance
- Core formula: ARPA x Gross Margin % divided by Churn Rate.
- Used by revenue, finance, and marketing teams to set acquisition budgets.
- Must be calculated by cohort or segment, not as a single blended number.
- Net Revenue Retention above 100% makes the flat formula an undercount.
- Common pitfall: using gross revenue instead of gross margin in the numerator.
How is CLV / LTV actually calculated?
The standard B2B formula is LTV = ARPA x Gross Margin % / Churn Rate. If an average account pays $2,000 per month, gross margins sit at 75%, and monthly churn is 2%, LTV works out to $75,000. That figure sets a ceiling on how much a business can rationally spend to acquire a customer.
A more precise version factors in expansion revenue. Customers who grow their contracts over time carry a materially higher LTV than the base formula captures. If net revenue retention sits above 110%, the calculation needs to reflect that upward curve rather than a flat line to churn.
Why does LTV matter for B2B revenue decisions?
LTV without CAC is trivia. The ratio that actually drives decisions is LTV:CAC. A 3:1 ratio is generally the floor for a healthy SaaS business. Below that, the business is acquiring customers at a pace its margins cannot support. Above 5:1, it is likely under-investing in acquisition and leaving growth unrealized.
CAC Payback Period sits alongside this. A strong LTV:CAC ratio paired with a 24-month payback period signals a cash flow problem, not a unit economics problem. Both numbers have to work together. For account-based programs specifically, LTV by segment directly controls how spend gets allocated. Enterprise accounts with a $180,000 average LTV justify dedicated outbound sequences, account executives, and multi-touch campaigns. SMB accounts at $12,000 LTV do not, and running the same motion on both burns budget without proportional return.
What are the most common CLV / LTV mistakes?
Using revenue instead of gross margin
Including cost of goods sold, support costs, and implementation overhead in the numerator overstates what a customer is worth. Two customers at identical ARR can have dramatically different LTV if one requires three times the support load.
Calculating one blended number
A single company-level LTV hides the fact that a 2021 enterprise cohort might carry four times the LTV of a 2023 SMB cohort. Those segments need different retention investment, different upsell plays, and different acquisition budgets.
Treating LTV as a historical report
If churn is creeping up quarter over quarter, LTV is already lower than the model shows. The number should be recalculated on a rolling basis, not pulled once a year at board prep.
How does CLV / LTV connect to adjacent metrics?
Churn Rate is the denominator that controls everything. A 1% monthly churn gives an average customer life of 100 months. A 3% monthly churn cuts that to 33 months. Small churn improvements compound significantly into LTV over time.
ARPA feeds the numerator directly, which is why expansion revenue and upsell motions have a disproportionate effect on unit economics. Moving ARPA from $1,500 to $2,000 through a well-run expansion play lifts LTV by 33% without acquiring a single new customer.