顧客生涯価値（LTV）

Customer lifetime value (LTV) estimates the economic value a customer produces across their relationship with the company. SaaS teams often model it from ARPU, gross margin, churn rate, retention period, and expansion potential. A gross-margin view is usually more useful than a revenue-only view because it connects acquisition, pricing, onboarding, and customer success investment to profitability.

LTV formulas vary by business model. Early teams often use an ARPU, gross margin, and churn approximation, then replace it with cohort-based evidence as data improves. Simple SaaS formula | LTV = ARPU x gross margin / churn rate | Quick subscription estimate Duration formula | monthly gross profit x average customer lifetime | Useful when average tenure is known Cohort formula | cumulative gross profit by acquisition cohort | Reveals channel and segment differences

LTV means different things depending on whether it is revenue-based or gross-profit-based. Align the definition with CAC before using it for investment decisions. Include | Recurring revenue, expansion revenue, gross margin, retention period, cohort behavior | They define future customer value Exclude | Taxes, refunds, one-off anomalies, acquisition cost itself | Avoid mixing LTV with CAC Define carefully | Support cost, discount rate, referrals, upsells, usage-based revenue | Treatment depends on the model

LTV moves with pricing, retention, gross margin, usage, expansion, and support cost. Churn rate | Customers leave sooner | Average lifetime and LTV fall ARPU / ACV | Customer price changes | LTV changes even at the same retention rate Gross margin | Delivery cost changes | Revenue LTV and gross-profit LTV diverge Expansion | Seats or plans grow | Existing customers produce more value

Sets the ceiling for acceptable CAC. That makes budgeting, acquisition spend, retention work, and board reporting easier to compare on the same basis. Shows which segments, channels, and plans deserve more investment. Tests whether pricing, onboarding, and customer success spend improve long-term economics.

• Sets the ceiling for acceptable CAC. That makes budgeting, acquisition spend, retention work, and board reporting easier to compare on the same basis.
• Shows which segments, channels, and plans deserve more investment.
• Tests whether pricing, onboarding, and customer success spend improve long-term economics.

• Gross-profit LTV is usually better for investment decisions than revenue LTV.
• Segment and channel distribution matters more than one company-wide average.
• Small churn changes can materially change LTV.
• LTV/CAC is a core unit economics pair.
• Early LTV is a hypothesis that must be refreshed with cohort data.

LTV is an estimate, not a fact. Treat it as a range when data is limited. Extrapolating long-term LTV from short cohorts can overstate value. Revenue-only LTV hides gross margin and support burden. High average LTV does not justify spend in low-LTV channels.

• Extrapolating long-term LTV from short cohorts can overstate value.
• Revenue-only LTV hides gross margin and support burden.
• High average LTV does not justify spend in low-LTV channels.

Read LTV with CAC, churn, ARPU, NRR, and gross margin. CAC | Acquisition cost | Tests whether customer value exceeds acquisition spend Churn Rate | Customer or revenue loss | Often the largest LTV driver ARPU / ACV | Customer price level | Provides the revenue base for LTV NRR | Existing-customer revenue retention | Shows whether value grows after acquisition

A B2B SaaS team splits customers into SMB and mid-market cohorts. SMB accounts have lower ARPU and often churn after six months, while mid-market accounts retain for about 24 months at 70% gross margin. The company-wide average hides the difference, but cohort LTV/CAC shows mid-market customers are much healthier. The team reduces some SMB paid spend and shifts investment into mid-market onboarding and sales enablement.

LTV | Future customer value | Guides investment limits and segment priority CLV | Customer Lifetime Value | Often used interchangeably with LTV ARPU | Average revenue per period | Input to LTV, but excludes lifetime CAC | Cost to acquire a customer | Compared against LTV for unit economics CAC payback | Months to recover CAC | Shorter-term cash view than LTV

• LTV is fixed once calculated. It changes with churn, price, margin, segment mix, and product value.
• Revenue LTV is enough. Gross margin and support cost can change the conclusion.
• Average LTV is safe for media buying. Channel-level LTV can differ sharply.