Customer Lifetime Value (LTV)
カスタマー・ライフタイム・バリュー
Customer Lifetime Value, usually shortened to LTV or CLV, estimates the economic value a customer can generate over the customer relationship. It is a decision metric for acquisition, retention, pricing, and segment focus, not a guaranteed accounting number.
What it means
LTV estimates the long-term value of a customer or customer segment by combining revenue or gross profit, retention, churn, customer life, and sometimes discounting. Teams use it to decide how much they can spend to acquire and retain customers, which segments deserve investment, and whether growth is creating durable value. The number is model-based, so the formula, margin basis, churn assumption, CAC treatment, and time horizon must be explicit.
How to calculate it
There is no single universal LTV formula. Pick the formula that matches the decision and disclose the assumptions. Simple subscription LTV | Average revenue per customer per period x gross margin x expected customer life | Quick directional model Churn-based LTV | MRR or gross profit per customer x (1 / churn rate) | Useful when churn is stable and measured consistently Cohort LTV | Sum of expected gross profit by cohort over time, optionally discounted | Better for segments with different retention curves
| Lens | Formula / treatment | When to use it |
|---|---|---|
| Simple subscription LTV | Average revenue per customer per period x gross margin x expected customer life | Quick directional model |
| Churn-based LTV | MRR or gross profit per customer x (1 / churn rate) | Useful when churn is stable and measured consistently |
| Cohort LTV | Sum of expected gross profit by cohort over time, optionally discounted | Better for segments with different retention curves |
What counts / what does not
LTV becomes useful only when the model boundary is explicit. Include | Revenue or gross profit from the defined customer relationship, expected retention, expansion, contraction, and cost-to-serve when relevant | Captures economic value Exclude | One-time acquisition spikes, unsupported infinite-life assumptions, revenue outside the cohort, and costs not in the stated formula | Prevents inflated LTV Disclose | LTV or CLV naming, revenue versus gross profit basis, churn window, discount rate, CAC treatment, time horizon, and segment definition | Makes comparisons valid
| Item | Treatment | Why it matters |
|---|---|---|
| Include | Revenue or gross profit from the defined customer relationship, expected retention, expansion, contraction, and cost-to-serve when relevant | Captures economic value |
| Exclude | One-time acquisition spikes, unsupported infinite-life assumptions, revenue outside the cohort, and costs not in the stated formula | Prevents inflated LTV |
| Disclose | LTV or CLV naming, revenue versus gross profit basis, churn window, discount rate, CAC treatment, time horizon, and segment definition | Makes comparisons valid |
What moves the number
LTV changes when customer economics, retention, expansion, margin, and acquisition quality change. Retention | Longer customer life increases expected value Revenue per customer | Pricing, usage, seat count, and expansion raise or lower value Gross margin and cost to serve | High service cost can reduce value even when revenue is high Acquisition quality | Channels that bring sticky, high-margin customers improve LTV/CAC
| Driver | Metric impact |
|---|---|
| Retention | Longer customer life increases expected value |
| Revenue per customer | Pricing, usage, seat count, and expansion raise or lower value |
| Gross margin and cost to serve | High service cost can reduce value even when revenue is high |
| Acquisition quality | Channels that bring sticky, high-margin customers improve LTV/CAC |
When it helps
Sets a rational ceiling for CAC, payback, channel bids, sales capacity, and retention investment. Reveals which customer segments deserve growth focus because they create durable value. Connects marketing, sales, pricing, product, and customer success decisions into one economic model.
- Sets a rational ceiling for CAC, payback, channel bids, sales capacity, and retention investment.
- Reveals which customer segments deserve growth focus because they create durable value.
- Connects marketing, sales, pricing, product, and customer success decisions into one economic model.
How to use it
- LTV is an estimate, not a guarantee.
- Gross-profit LTV is usually more decision-useful than revenue-only LTV.
- LTV should be segmented by cohort, channel, plan, market, or customer size when behavior differs.
- Read LTV with CAC, payback period, retention, NRR, and gross margin.
Decision cautions
LTV can become dangerous when teams use optimistic assumptions to justify spend. Small churn-rate changes can produce large LTV swings. Revenue-only LTV can hide poor gross margin or expensive customer support. Average LTV can hide segment differences and cause overspending in low-quality channels.
- Small churn-rate changes can produce large LTV swings.
- Revenue-only LTV can hide poor gross margin or expensive customer support.
- Average LTV can hide segment differences and cause overspending in low-quality channels.
Read with
LTV should be interpreted with acquisition and retention metrics. CAC | Cost to acquire a customer | Tests acquisition efficiency LTV/CAC | LTV divided by CAC | Tests whether acquisition spend is economically justified Payback Period | Time to recover CAC | Tests cash timing NRR | Existing-customer revenue retained and expanded | Tests customer value growth
| Metric | Role | Why read together |
|---|---|---|
| CAC | Cost to acquire a customer | Tests acquisition efficiency |
| LTV/CAC | LTV divided by CAC | Tests whether acquisition spend is economically justified |
| Payback Period | Time to recover CAC | Tests cash timing |
| NRR | Existing-customer revenue retained and expanded | Tests customer value growth |
Example
A subscription product has $120 monthly gross profit per account and monthly logo churn of 3%. A simple churn-based model estimates customer life at 33.3 months, so gross-profit LTV is about $4,000. If CAC is $1,200, the LTV/CAC ratio is about 3.3x. The team still checks payback and segment quality before increasing spend because churn and support cost differ by channel.
Compare with
LTV / CLV | Estimated long-term customer value | Investment and segment decision CAC | Acquisition cost | Spend efficiency decision ARPU / ARPA | Average revenue per user or account | Near-term monetization view NRR | Existing-customer revenue retention including expansion | Recurring customer base quality
| Metric | Difference | Why read together |
|---|---|---|
| LTV / CLV | Estimated long-term customer value | Investment and segment decision |
| CAC | Acquisition cost | Spend efficiency decision |
| ARPU / ARPA | Average revenue per user or account | Near-term monetization view |
| NRR | Existing-customer revenue retention including expansion | Recurring customer base quality |
Common mistakes
- High LTV means unlimited acquisition spend. Cash timing, payback, confidence, and channel quality still matter.
- One company-wide LTV is enough. Segments can have very different retention and margin profiles.
- LTV is the same as total revenue. LTV is a forward-looking model of customer economics.
Frequently asked questions
Should I use LTV or CLV?
Both are common. Use one canonical label in reporting and keep the aliases searchable.
Should LTV use revenue or gross profit?
For investment decisions, gross-profit LTV is usually more useful because revenue alone ignores cost to serve.
Can LTV be negative?
The modeled customer value can be unattractive or below CAC when churn, margin, or support cost make the relationship uneconomic.