Customer Lifetime Value (CLV)

LTV · CLV · Lifetime Value

Definition

Customer lifetime value (LTV) is the projected total revenue from a customer across the entire relationship with the company, used to assess marketing efficiency and unit economics.

How to calculate LTV

The base formula for e-commerce:

LTV = AOV × Purchase frequency per year × Average retention (years)

Example:
AOV = $70
Frequency = 4 purchases a year
Retention = 2.5 years
LTV = 70 × 4 × 2.5 = $700

An established business with data history uses a cohort calculation instead: take the cohort of a
first purchase and look at cumulative revenue at 12, 24 and 36 months. It is more accurate than the
formula.

LTV and unit economics

LTV is the key input for deciding what you can afford to pay to acquire a customer (CAC). If CAC is
$100 and LTV is $700, the LTV:CAC ratio is 7:1 — the business can invest aggressively in growth. If
LTV:CAC drops below 2:1, every acquired customer is a loss.

Metric	Good	Warning sign
LTV:CAC	≥ 3:1	< 2:1
CAC payback period	< 12 months	> 18 months
LTV of the top segment / average LTV	> 3×	< 1.5×

How personalization affects LTV

LTV = AOV × frequency × retention. Personalization acts on all three multipliers:

AOV — cross-sell and upsell recommendations raise the basket through complementary products
Frequency — personalized triggers and retargeting bring customers back more often
Retention — a relevant experience lowers churn: the customer finds what they need faster and leaves for a competitor less often

Tip: calculate LTV per segment (RFM cohorts), not only as an average. The top 20% of customers
often generate 60–80% of revenue — their LTV is the real economic ceiling for CAC.

The limits of the metric

LTV is a forecast, not a fact. The true retention period is unknown until the lifecycle ends. In
highly competitive markets, an LTV computed on historical data will systematically overstate the
number once retention starts to decline.

Frequently asked questions

What LTV to CAC ratio counts as healthy?

In e-commerce, an LTV:CAC ratio of 3:1 or better is considered healthy. Below 2:1 the business is spending too much on acquisition relative to the return. Above 5:1 it may be underinvesting in growth.

How do you calculate LTV before you have full lifecycle data?

Use a predictive approach — a model built on the customer's first 90–180 days of activity (RFM signals, return frequency). For a mature business, use historical cohort data spanning one to two years.

How is LTV different from ARPU?

ARPU (average revenue per user) is revenue for a period — a month or a quarter — divided by the number of active users. LTV is the cumulative revenue across the whole relationship. ARPU multiplied by the average customer lifespan in periods equals LTV.

How does personalization affect LTV?

Personalization raises both purchase frequency and average order value, and both feed directly into LTV. Recommendations drive cross-sell and repeat visits, while segmented communications reduce churn.

Gravity Field