What Is Customer Lifetime Value (LTV)? Definition, Formula & How to Grow It

Customer lifetime value (LTV, sometimes CLV or CLTV) is the total revenue a single customer generates across the entire span of their relationship with your brand. You calculate it by multiplying average order value by purchase frequency by customer lifespan — and multiplying by gross margin if you want profit, not just revenue. LTV matters because it tells you the maximum you can afford to spend acquiring a customer and still grow profitably. For most B2C and subscription brands, the fastest way to raise LTV is not more acquisition — it is retention. A 5% increase in customer retention can lift profit by 25% to 95% (Bain & Company).

Key Takeaways

• LTV = Average Order Value × Purchase Frequency × Customer Lifespan. Multiply by gross margin % for profit LTV.
• Retention is the biggest lever. A 5% increase in retention can raise profit 25–95% (Bain & Company / HBR).
• Existing customers are cheaper and bigger. Acquiring a new customer costs ~5× more than retaining one, and existing customers spend ~31% more (Invesp).
• Aim for an LTV:CAC ratio near 3:1. Below that, unit economics break; far above it, you are likely under-investing in growth.
• Lifecycle flows compound LTV: welcome, post-purchase, replenishment, and win-back are where value is won or lost.

What is customer lifetime value?

Customer lifetime value is a forward-looking estimate of the total revenue (or profit) you can expect from one customer over the life of the relationship. Instead of judging a customer by their first order, LTV judges them by the whole arc: the reorders, the upgrades, the referrals, and the years they stay. That shift in time horizon changes every downstream decision — how much you bid for a click, which segments you prioritize, and where you invest in lifecycle marketing.

How to calculate LTV (with a worked example)

The simplest, most widely used formula is:

LTV = Average Order Value × Purchase Frequency (per year) × Customer Lifespan (years)

For example: $60 AOV × 3 orders/year × 2.5 years = $450 Revenue LTV. At 60% gross margin, that becomes $270 Profit LTV — the number you should actually compare against acquisition cost. Always be explicit about whether you are quoting revenue LTV or profit LTV; teams routinely overstate value by reporting the former and budgeting as if it were the latter.

For a more granular read on how different acquisition cohorts compound differently over time, see cohort LTV vs blended LTV.

LTV vs. CLV vs. CAC: what's the difference?

LTV and CLV (customer lifetime value) are the same metric — different acronyms. CAC, customer acquisition cost, is the average cost to win a new customer. LTV measures what a customer is worth; CAC measures what they cost to acquire. The relationship between the two — the LTV:CAC ratio — is the single clearest read on whether your growth is sustainable.

What is a good LTV:CAC ratio?

A widely used benchmark is roughly 3:1 — three dollars of lifetime value for every dollar of acquisition cost. At 1:1 you are buying customers at a loss once you include overhead. Well above 5:1 usually means you are leaving growth on the table by under-spending on acquisition. The ratio is also a retention story: because the probability of selling to an existing customer is 60–70% versus 5–20% for a new prospect (Marketing Metrics), raising retention lifts the LTV side of the ratio far more cheaply than chasing new CAC.

How to increase customer LTV

Three levers move LTV: order value, purchase frequency, and lifespan. Lifecycle marketing touches all three:

• Welcome series sets the belief that earns the second purchase.
• Post-purchase flows turn a first order into a habit and catch silent delivery failures before they cost you reorders.
• Replenishment & cross-sell raise frequency by timing the next offer to real usage windows.
• Win-back extends lifespan by reactivating lapsing customers before they fully churn.

Because existing customers spend about 31% more than new ones and cost roughly 5× less to retain than acquire (Invesp), the highest-ROI LTV work is almost always tightening these flows — not buying more traffic. This is also why customer activation in the first 30 days has such an outsized impact: the customers who activate early generate compounding LTV; those who don't rarely return.