Ecommerce & CRO
LTV
Lifetime Value · CLV · Customer Lifetime Value
LTV, or customer lifetime value, is the total profit a business expects from one customer across the whole relationship. It is what justifies acquisition spend: if LTV is $180 and it costs $60 to acquire a customer, the ratio of 3:1 is generally considered healthy. LTV rises with repeat purchase rate, AOV, and margin, and falls with churn.
Why it matters
LTV is what turns acquisition from a gamble into a calculation. Without it, every marketing decision is judged on the first order, which systematically undervalues channels that bring loyal customers and overvalues those that bring one-time discount hunters.
The ratio against CAC is the number that matters. Around 3:1 is the conventional target — enough margin to cover overhead and fund growth. Well below that, the business is buying revenue at a loss and will run out of cash while looking busy. Well above it, the business is probably under-investing in acquisition and leaving growth on the table.
The subtlety most calculations miss: LTV should be built on contribution margin, not revenue. A customer generating £500 of revenue at 20% margin is worth £100, and paying £150 to acquire them is a slow way to fail.
How it works on Shopify
The honest version needs three inputs from Shopify's reports: average order value, purchase frequency over a defined window, and gross margin. Multiply the first two by the third and you have a defensible historical figure.
The window matters. "Lifetime" is not measurable for a business that is three years old, so pick a horizon the business can actually act on — twelve or twenty-four months — and hold it constant. A figure that quietly changes its horizon cannot be compared with itself.
Cohort analysis is where the number becomes useful. Shopify's cohort reports group customers by first-purchase month and track their repeat behaviour, which shows whether recent customers are better or worse than last year's. That trend is more informative than the aggregate, because the aggregate is dominated by customers acquired under conditions that no longer exist.
Segmenting by acquisition channel is the other essential cut, and it is where Klaviyo or a similar platform usually does more than Shopify's native reporting.
Common mistakes
- Using revenue instead of margin. The most common error, and it inflates the figure by whatever the cost of goods is.
- One LTV for everyone. Channels, first products, and discount status produce different curves. The average describes nobody.
- Ignoring churn. For subscriptions, LTV is churn arithmetic. A small change in monthly churn moves the number substantially.
- Extrapolating from thin data. A young business projecting five-year LTV from eight months of history is guessing with decimal places.
- Forgetting returns. A customer who buys often and returns half of it is not the customer the report describes.
When you need help
The trigger is usually a disagreement about acquisition spend that nobody can settle — marketing says the channel is profitable, finance says it is not, and both are reading different numbers.
Building an LTV model the whole business agrees on, segmented by channel and net of margin and returns, is what ends that argument. It is analysis rather than engineering, but it needs the underlying data joined correctly first, which is where the Shopify, ad platform, and email platform figures usually disagree.
Related terms
- CACCAC, or customer acquisition cost, is the total sales and marketing spend needed to win one new customer. It is read against LTV: a business whose CAC approaches its LTV is buying revenue at a loss. Rising ad costs are the main reason merchants invest in organic channels such as SEO, where the cost per customer falls over time instead of rising.
- Churn rateChurn rate is the share of customers or subscribers who stop buying over a given period. It is the mirror of retention and the single biggest input into LTV for a subscription business — a subscription with 10% monthly churn keeps the average customer for ten months. Voluntary churn is a product problem; involuntary churn (failed payments) is usually a solvable technical one.
- Subscription commerceSubscription commerce is selling on a recurring schedule rather than one order at a time — replenishment of consumables, curated boxes, or memberships. It converts a one-off purchase into predictable recurring revenue and raises LTV sharply, at the cost of managing dunning, churn, and subscriber-facing account tooling. On Shopify it is built on the Subscriptions APIs, usually through an app.
- AOVAOV, or average order value, is the average amount a customer spends per order — total revenue divided by number of orders over the same period. It is one of the three levers on ecommerce revenue, alongside traffic and conversion rate. Raising AOV through bundling, upsells, or free-shipping thresholds is usually cheaper than buying more traffic.