E-commerce LTV: what lifetime value is and how to calculate it to grow with margin

What is lifetime value (LTV) and why does it matter so much?

LTV answers a simple question: how much real profit does a customer generate, on average, for as long as they keep buying from you?

The answer defines your maximum sustainable CAC — how much you can spend on ads to acquire a customer without the business losing money. If your LTV is $5,000 ARS in net profit and your CAC is $6,000 ARS, you're losing $1,000 on every new customer. At scale, that destroys margins even while sales go up.

Without LTV, the only metric you have to judge advertising is first-purchase ROAS — and that pushes you toward decisions that optimize the short term and wreck the business in the medium term.

How do you calculate lifetime value in e-commerce?

The base LTV formula is:

A concrete example for an Argentine personal care store:

• Average order value: $8,000 ARS
• Purchase frequency: 4 times a year
• Gross margin: 35%
• Average retention: 2 years

LTV = 8,000 × 4 × 0.35 × 2 = $22,400 ARS

That's what one customer is worth to that business. If CAC is $4,000 ARS, the LTV:CAC ratio is 5.6:1 — healthy and scalable. If CAC is $15,000 ARS, everything needs a second look.

Why does LTV completely change how you judge your Meta Ads campaigns?

When you measure a campaign only by first-purchase ROAS, a campaign that brings in new customers with a low order value can look bad. But if those customers buy 6 times a year for 3 years, their LTV makes them the most valuable people in your base.

The problem is that Meta's dashboard has no way of knowing that. It shows you cost per acquisition and first-purchase value. It doesn't know whether that customer will come back.

That's why you need to calculate LTV by customer segment — by acquisition channel, by first product category, by discount type. Once you have that data, you can set a different target CAC per segment and optimize campaigns accordingly.

It also changes how you read your real ROAS: if you know a customer is worth $22,000 ARS over 2 years, you can afford to acquire them at a 1.5x first-purchase ROAS knowing the business still makes money.

Which margin should you use to calculate LTV?

This is the most common mistake when calculating LTV: using the wrong margin.

• Gross margin: sales minus product cost. It doesn't subtract shipping, fees or advertising. It's the starting point, not the final number.
• Contribution margin: sales minus every variable cost (product, shipping, platform and processor fees, proportional advertising). This is the right margin for calculating LTV.
• Don't use net margin: net margin includes fixed costs that don't scale per customer — it distorts LTV.

In Argentina, the real contribution margin of many stores is 15-25% — far below the 35-40% they see in Tiendanube, because they aren't subtracting Mercado Pago fees, subsidized shipping or interest-free installments.

Calculating LTV with your real contribution margin means knowing those variable costs precisely — something Escalafy adds up automatically so the number in your calculations is the real one, not an optimistic estimate.

What's a good LTV:CAC ratio for an e-commerce store in Argentina?

The rule of thumb is an LTV:CAC above 3:1. That means for every peso you spend acquiring a customer, you get back at least $3 in profit over their life as a customer.

• Below 2:1: the business is probably burning cash even while sales grow. Each new customer costs too much or carries too little margin.
• Between 2:1 and 3:1: warning zone. It works, but there isn't much room for mistakes or CPM increases.
• Above 3:1: healthy. There's room to grow and absorb rising ad costs.
• Above 5:1: very efficient. Sometimes it means you could invest more in acquisition to grow faster.

Knowing your real LTV:CAC ratio means crossing per-customer profitability data with acquisition cost by channel — something neither Meta nor Tiendanube gives you on their own, but that Escalafy calculates by connecting all the data in one place.

How do you improve LTV without lowering order value?

There are three ways to improve LTV:

• Increase repurchase frequency: email marketing, repurchase flows in Klaviyo, subscriptions or loyalty programs.
• Increase margin per purchase: raise prices, lower product costs, renegotiate fees, improve product mix. Profitability by product is the starting point.
• Keep customers longer: improve the post-sale experience, product quality and support. A customer who stays 3 years instead of 2 has 50% more LTV.

But to know which of the three levers has the most impact, you need to measure LTV by segment — and that takes clean, connected historical data calculated with the right margin.

What tools do you need to measure LTV in your e-commerce store?

There are a few approaches on the market:

• CRM / email marketing tools (Klaviyo, HubSpot): they calculate historical LTV but without real costs — they use revenue, not profit.
• Excel with exported Tiendanube data: works for small volumes, but doesn't scale and has a high margin of error.
• E-commerce analytics platforms (Triple Whale, Northbeam): built around advertising, they don't handle local platform costs like Mercado Pago or Tiendanube fees in Argentina well.
• Escalafy: connects every sales channel and your real costs, so the margin it uses to calculate LTV is your real margin — with shipping, fees, interest-free installments and product costs included.

The practical difference: if you calculate LTV with a 35% gross margin when your real margin (with every cost) is 18%, your target CAC is wrong too — and you're burning cash without knowing it.