Customer Lifetime Value (LTV)

What it means

LTV estimates the long-term profit from a customer or customer segment. This page follows the simple profit-based convention described by OpenStax and uses profit per customer, average retention period, and CAC. Teams use it to inform acquisition, retention, and segment decisions, but it is not a guaranteed accounting amount. The profit scope, time unit, retention assumption, and whether CAC is deducted must be explicit.

How to calculate it

There is no single universal LTV convention. This page uses an explicit profit-based model so the time unit and CAC treatment remain comparable across locales. Profit before acquisition cost | Average profit per customer per period x expected customer life in the same periods Net CLV after acquisition cost | Profit before acquisition cost - CAC | This is the OpenStax convention used for the worked example Unit rule | If profit is monthly, customer life must be in months; if profit is annual, customer life must be in years

What counts / what does not

This page fixes the boundary to one profit-based LTV model. Include | Defined profit per customer per period, average retention in the same unit, and explicitly stated CAC | Keeps inputs comparable Exclude | Revenue outside the relationship, costs omitted from the stated formula, and unsupported infinite retention | Prevents inflated LTV Disclose | Profit scope, monthly or annual unit, basis for average retention, CAC treatment, and customer segment | Makes the decision reproducible

What moves the number

Under this model, LTV changes when profit per customer, retention length, or CAC changes. Profit per customer | Changes with the stated revenue and direct-cost scope Average retention period | A longer relationship increases expected cumulative profit CAC | Higher acquisition cost reduces net CLV even when pre-acquisition profit is unchanged Segment mix | Combining groups with different profit, retention, and CAC can hide decision-relevant differences

When it helps

Creates an economic reference for evaluating CAC and acquisition or retention investment. Identifies customer segments with stronger profit and retention economics for investment prioritization. Compares realized profit and retention with assumptions so acquisition and retention decisions can be revised.

• Creates an economic reference for evaluating CAC and acquisition or retention investment.
• Identifies customer segments with stronger profit and retention economics for investment prioritization.
• Compares realized profit and retention with assumptions so acquisition and retention decisions can be revised.

How to use it

• LTV is an estimate, not a guarantee of future profit.
• Use matching profit and retention units and always state whether CAC is deducted.
• Check meaningful customer groups separately when profit, retention, or CAC differs.
• Reconcile the estimate with realized customer profit, retention, and CAC and update it regularly.

Decision cautions

Do not use optimistic profit or retention assumptions to justify acquisition spend. A small increase in assumed retention raises LTV, so record the evidence and observation window. Treating revenue as profit can omit direct costs required to serve the customer. A company-wide average can hide segment differences and lead to overspending on weak customer economics.

• A small increase in assumed retention raises LTV, so record the evidence and observation window.
• Treating revenue as profit can omit direct costs required to serve the customer.
• A company-wide average can hide segment differences and lead to overspending on weak customer economics.

Read with

Read LTV with the inputs and realized outcomes used by the model. Profit per customer | Supplies the value generated in each period Average retention period | Supplies the assumed relationship duration CAC | Supplies the acquisition-cost deduction Realized customer profit | Tests the estimate after the observation period

Example

A subscription product earns $1,200 in annual profit per customer and expects to retain a customer for three years. Profit before acquisition cost is $1,200 x 3 = $3,600. With CAC of $900, the OpenStax-style net CLV is $3,600 - $900 = $2,700. The team records the annual time unit, profit basis, three-year retention assumption, and CAC treatment before comparing segments.

Compare with

LTV / CLV | Estimated profit over the customer relationship | Acquisition, retention, and segment decisions CAC | Cost to acquire a customer | Acquisition-efficiency decision Profit per customer | Customer economics for one period | Input to the LTV calculation Revenue | Consideration received from a customer | Differs from profit-based LTV because direct costs are not deducted

Common mistakes

• High LTV permits unlimited acquisition spend. CAC treatment, assumption confidence, and cash constraints still matter.
• One company-wide LTV is enough. Separate customer groups when profit, retention, or CAC differs.
• LTV is the same as total revenue. This page uses an estimate based on profit and retention duration.

Frequently asked questions

Sources

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