In marketing, LTV means customer lifetime value: the revenue one customer brings you over their whole relationship with your business. You will also see it written CLV or CLTV. It is the same measure. LTV answers a question your ads do not ask on their own: how much is the person your campaign just brought in really worth? Judging a customer on their first order is like judging a fruit tree on its first harvest. LTV looks at every season. It helps you set the price you can pay to win a customer, compare your channels over time, and give Google Ads a fairer value. This guide is for online stores, subscription businesses and services that sell more than once to the same customer. The loan-to-value ratio used for mortgages is a different topic.
What LTV Is Used For
LTV turns a sale into a customer. It guides three decisions:
- Set your maximum acquisition cost: a customer who orders four times a year justifies a higher spend than a one-time buyer. LTV gives the ceiling. Your margin gives the share you can invest to win that customer.
- Compare your channels over time: two campaigns with the same cost per sale can bring very different customers. The one whose customers come back is worth more, even with a lower ROAS today.
- Give your bids a fair value: Google Ads can bid higher for a new customer than for an existing one. LTV tells you how big that gap should be.
How To Calculate LTV
The simplest formula fits on one line:
LTV = average order value × purchases per year × relationship length in years
Here is an example calculation: an average order of 80 EUR, two and a half purchases a year, three years of relationship. LTV is 80 × 2.5 × 3 = 600 EUR of revenue. A subscription works the same way: a plan at 29 EUR a month, kept for 14 months on average, gives an LTV of 406 EUR.
This revenue still includes your costs. To set a budget, the useful version is margin LTV: LTV multiplied by your gross margin rate. At a 40% margin, the 600 EUR become 240 EUR. Your acquisition cost has to fit inside those 240 EUR. The LTV calculator does both calculations and gives you the maximum acquisition cost your margin can carry.
Google Analytics 4 also calculates its own version. According to Analytics Help, lifetime value (LTV) shows the total revenue from purchases on your website or app, minus refunds. GA4 also shows an "Average 120d value": the sum of each user's revenue over their first 120 days, averaged across all users. It helps you compare recent groups of new customers before you have years of history.
A Real Example From An Online Store
On an online store I work with, GA4 counts 2,776 buyers and 2,818 orders between October 16, 2025 and October 15, 2026, so 1.02 orders per buyer. In Google Ads, over the 90 days before October 15, 2026, the same store records 546 sales. Only 18 of them are attributed to returning customers.
Read at face value, these numbers suggest almost nobody comes back. In fact, they mostly measure what the tools can recognize. GA4 links the visits of one person through a device ID, unless the site sends a signed-in customer ID, called User-ID. Analytics Help describes User-ID as the most accurate identity space. A customer who orders on her phone in March and on her laptop in September can count as two buyers.
So the LTV of this store lives in its order database. There, each customer keeps the same email address from one order to the next. That is where LTV gets calculated: orders per email address over twelve months, average order value, margin. GA4 and Google Ads then help you compare channels with each other, using the same reading rule for all of them.
LTV Or ROAS: What Each One Measures
ROAS divides conversion value by ad spend. It judges the order Google saw, inside its conversion window. LTV judges the customer over the whole relationship. That includes orders placed months later from your newsletter, or by typing your site address directly.
The two work together. A campaign with a ROAS of 2 can become the most profitable one in the account if its customers come back four times. A campaign with a ROAS of 5 can bring one-time buyers. ROAS tells you if the campaign pays for itself today. LTV tells you if the customer pays for themselves over time. Compared with acquisition cost, LTV gives the LTV:CAC ratio, explained in the CLV:CAC ratio guide.
How To Bring LTV Into Google Ads
Google Ads sees conversions. You tell it which ones come from new customers. For this, it offers customer lifecycle goals for Performance Max, Search, Shopping and Demand Gen campaigns:
- New Customer Value: Google bids higher for new customers than for existing ones. This mode needs value-based bidding (Target ROAS or Maximize conversion value) and at least one Purchase conversion goal.
- High Value New Customer: Google bids even higher for new customers who look like your best existing customers, based on a customer list you upload.
- Re-engagement: Google bids higher for lapsed customers, in Performance Max, based on a list of lapsed customers.
Your LTV helps you set the first mode. If a new customer brings you several orders in a year, the value added to their first order can reflect part of that future margin. Google shows this adjustment in the "New customer lifetime value" column. With 5 customer acquisition conversions and an assigned value of 25 EUR, the column shows 125 EUR, according to Google Ads Help. To help Google recognize your existing customers, the same page recommends the new vs. existing customer parameter in your conversion tracking tag, next to a customer list.
Common Mistakes
- Deciding on revenue: an LTV of 600 EUR at a 40% margin leaves 240 EUR to pay for acquisition, delivery and service. A budget set on 600 EUR spends money the customer will never leave you.
- Taking an ad tool's LTV for your business LTV: GA4 and Google Ads see devices and clicks. Your order database sees customers.
- Projecting a lifetime with no history: a store that opened a year ago and plans on five years of loyalty is inventing four years. An LTV measured over twelve months, then extended as data comes in, holds up.
- One average for all customers: a customer who came from a promotion and a customer who searched for your brand can come back at very different rates. Calculate LTV by acquisition channel, or at least by first product bought.
- Forgetting refunds: GA4 removes them from its lifetime value. Your own formula should do the same.
The Limits Of LTV
LTV is an average, and an average hides profiles. A few excellent customers can carry the value of all the others. GA4 makes this visible in its "User lifetime" exploration. It shows lifetime value as an average, a total, or a percentile (10th, 50th, 80th and 90th), for example by first user medium.
It is also a number from the past that guides decisions about the future. A new offer, a price increase or a new competitor changes how often people buy. Last year's LTV then describes a different business. Recalculate it each time your offer changes.
Finally, LTV measures value. Time needs its own measure. A customer who brings 240 EUR of margin over three years pays back their acquisition cost little by little. The CAC payback period calculator tells you how many months it takes for your cash to come back.
The Three Most Searched Questions
LTV or CLV, what is the difference? They are the same measure. LTV (lifetime value), CLV (customer lifetime value) and CLTV all describe the value of a customer over the whole relationship. GA4 says "lifetime value". Google Ads says "new customer lifetime value". Just check what each source counts: revenue or margin, and over what period.
How do you calculate the LTV of a customer? For one specific customer, add up all their orders since the first one, minus refunds. For an average, multiply the average order value by purchases per year, then by the relationship length in years. Then apply your gross margin to get margin LTV, the version you use to set a budget.
How are LTV and CAC related? CAC is what you pay to win a customer. LTV is what that customer brings you. Their ratio tells you if your growth creates value: when margin LTV is well above CAC, each new customer makes the business richer. The CLV:CAC ratio guide explains the benchmarks and how to track the ratio.
Before you tune a campaign on LTV, open your order database and count how many customers ordered a second time within the year. That is the calculation I run before touching a budget: it starts from your margin.
