What is LTV (Customer Lifetime Value)?
Short answer: LTV (customer lifetime value) is the total gross profit you expect to earn from a single customer over the whole time they stay with you. It’s the number that tells you how much you can afford to spend acquiring a customer — and whether your business model actually works.
Why LTV is the most important number you’re probably ignoring
Most advertisers obsess over CPA and ROAS on the first purchase. But a customer who buys once and a customer who buys every month for three years are worth wildly different amounts — even if their first order looks identical. LTV captures that difference.
If your customers have high LTV, you can afford to outspend competitors on acquisition and still profit. If your LTV is low, an aggressive CAC will quietly bankrupt you no matter how good your ads look on day one.
The simple LTV formula
- LTV = Average order value × purchase frequency × customer lifespan × gross margin
- Example: $60 AOV × 4 orders/year × 3 years × 40% margin = $288 LTV
For subscription businesses, a quicker version is: LTV = (average monthly revenue per customer × gross margin) ÷ monthly churn rate. See how to calculate LTV for worked examples of both.
Always use gross profit, not revenue
The single most common LTV mistake is calculating it on revenue. A customer who generates $1,000 in revenue at a 30% margin only contributes $300 in gross profit — and that $300 is what you actually have available to spend on acquisition and overhead. Revenue-based LTV makes your unit economics look three times healthier than they are.
LTV and CAC: the relationship that decides everything
LTV is meaningless on its own. Its power comes from comparing it to CAC (customer acquisition cost):
- LTV:CAC of 3:1 or higher — healthy; you earn at least 3× what it costs to acquire a customer
- LTV:CAC of 1:1 — you break even on acquisition with nothing left for operations or profit
- LTV:CAC of 5:1+ — you may be under-investing in growth and could scale faster
See the LTV:CAC ratio explained and run your numbers with the LTV:CAC calculator.
What raises LTV
- Higher retention — reducing churn extends customer lifespan, the highest-leverage LTV input
- Higher purchase frequency — email, loyalty programs, and replenishment reminders bring customers back
- Higher AOV — upsells, bundles, and cross-sells; see what is AOV
- Better margins — every point of margin flows straight into LTV
Common mistakes
- Using revenue instead of gross profit. Inflates LTV and leads to overspending on acquisition.
- Assuming a customer lifespan that hasn’t happened yet. A 12-month-old business can’t claim a 3-year lifespan. Use cohort data or be conservative.
- Ignoring payback period. A high LTV doesn’t help if it takes 18 months to recover CAC and you don’t have the cash to wait. See CAC payback period.
FAQ
Is LTV the same as CLV or CLTV?
Yes. LTV, CLV (customer lifetime value), and CLTV all refer to the same concept. The terms are used interchangeably.
What is a good LTV:CAC ratio?
3:1 is the widely cited benchmark for a healthy business. Below 3:1 suggests acquisition is too expensive or LTV is too low; well above 5:1 may mean you’re leaving growth on the table.
How far into the future should LTV look?
Most businesses cap LTV at a defined horizon (often 2–3 years) rather than truly “lifetime,” because distant cash flows are uncertain and worth less today. Pick a horizon you have data to support.