Customer LTV: Revenue, Gross Profit and CAC Comparisons

March 28, 2026

Author: Shusaku Yosa

Customer lifetime value (LTV or CLV) describes the value generated over a customer relationship. Revenue LTV and gross-profit LTV are different measures. State which you use and whether the number is observed or forecast.

When deciding how much to spend on acquisition, revenue alone can be misleading. Product costs, service effort and the time needed to recover acquisition spending all matter.

Choose a calculation that fits the decision

Method	Calculation	Useful application
Repeat-purchase estimate	Order value × purchase frequency × relationship duration	Model repeat-purchase assumptions
Subscription approximation	ARPA ÷ customer churn rate for the same period	Relatively stable recurring contracts
Observed cohort value	Cumulative revenue or gross profit ÷ customers originally acquired	Compare acquisition sources or onboarding changes

ARPA is average revenue per account. Keep account, customer and contract units consistent. Revenue churn and customer churn are not automatically interchangeable inputs.

Repeat-purchase example

Assume an order value of JPY 5,000, three purchases per year and a two-year relationship. Revenue LTV is JPY 30,000. At a constant 40% gross margin, gross-profit LTV is JPY 12,000, before acquisition cost.

These are hypothetical figures. Define how refunds, discounts, shipping and payment costs affect the calculation. A forecast two-year relationship is not the same as two years of observed purchases.

Subscription LTV and its assumptions

With monthly ARPA of JPY 10,000, monthly customer churn of 2% and gross margin of 80%, the simple revenue estimate is JPY 500,000 and gross-profit estimate JPY 400,000. Use monthly revenue with monthly churn, or annual inputs with annual inputs.

Monthly churn assumption	Revenue LTV	Gross-profit LTV at 80%
1%	JPY 1,000,000	JPY 800,000
2%	JPY 500,000	JPY 400,000
4%	JPY 250,000	JPY 200,000

The model assumes stable revenue and churn behavior. It can fail when cancellations concentrate early, contracts renew annually, pricing changes or expansion revenue becomes significant. A month with zero observed churn does not establish infinite value. Use a longer observation period or a bounded cohort measure.

Measure cohorts at the same age

Suppose 100 customers acquired in January produce JPY 6 million of revenue and JPY 4.2 million of gross profit during their first six months. The six-month observed values are JPY 60,000 and JPY 42,000 per acquired customer.

Keep the original 100 customers in the denominator, including those who canceled. Dividing only by survivors overstates acquisition-cohort value. Compare the February cohort at the same six-month age, not at a shorter maturity. The result is a six-month cumulative measure, not an already-observed lifetime.

Avoid subtracting CAC twice

Customer acquisition cost (CAC) uses the defined sales and marketing acquisition costs divided by new customers. For a conventional LTV/CAC comparison, use gross-profit LTV before deducting CAC. A value after CAC deduction divided by CAC is a different ratio.

Gross-profit LTV of JPY 400,000 and CAC of JPY 100,000 give a ratio of four. At steady monthly gross profit of JPY 8,000, simple payback is 12.5 months. A strong ratio can therefore coexist with slow cash recovery. Do not treat a universal “three times is healthy” rule as sufficient investment analysis.

Improve value with a measurable intervention

Investigate onboarding friction, whether customers achieve the promised outcome, reasons for cancellation and relevant expansion opportunities. If a discount raises retention but lowers margin, evaluate the net effect using profit-based value.

For each change, record the customer population, intervention, cohort age, retention, cumulative gross profit and service costs. Segment by source or plan to distinguish a real improvement from a shift toward higher-value customers. Use conservative, base and optimistic assumptions when future behavior remains uncertain.