How do I calculate LTV for my ecommerce store?

The formula is: LTV = Average Order Value x Purchase Frequency (per year) x Customer Lifespan (in years) x Gross Margin. For example, a brand with an $85 AOV, 2.2 purchases per year, a 2.5 year average customer lifespan, and a 42 percent gross margin has an LTV of $85 x 2.2 x 2.5 x 0.42 = $196.35. Each of these four inputs can be improved independently: AOV through bundling and upsells, frequency through retention flows, lifespan through churn reduction, and margin through pricing and cost management.

What is CAC in ecommerce?

CAC, or Customer Acquisition Cost, is the total spend required to acquire one new customer, calculated as total acquisition spend divided by number of new customers acquired in the same period. For example, $18,000 in monthly acquisition spend that produces 360 new customers gives a CAC of $50. CAC should include all paid acquisition spend (Meta, Google, influencer, affiliate) divided by new customers from those channels, not blended with organic.

How do I improve my LTV to CAC ratio?

There are two directions: increase LTV or decrease CAC, and most businesses have more available levers on the LTV side. To increase LTV: raise AOV through bundles and post-purchase upsells (signals AOV1-AOV4), improve retention and repeat purchase rate (signals R1-R4), and reduce churn (signal R4). To decrease CAC: reduce dependency on paid channels by building organic traffic (signal A5), which lowers blended CAC over time as a smaller share of new customers requires paid acquisition spend.

Signal LTV1: Customer Lifetime Value

Part of the Customer Lifetime Value signal group

Ecommerce LTV to CAC Ratio: The Number That Tells You Whether Your Business Is Actually Working

Q: What is a good LTV to CAC ratio for ecommerce?

A ratio of 3:1 is the minimum benchmark for a healthy ecommerce business: every dollar spent acquiring a customer should return at least three dollars in lifetime value. The 3:1 to 5:1 range is considered the healthy operating range for sustainable scaling, a framework popularized by ecommerce operator Andrew Faris. Below 2:1, the business is not generating an adequate return on acquisition spend and growth becomes difficult to fund. Above 5:1 can actually indicate underinvestment in growth: the business may be able to spend more on acquisition profitably.

Ecommerce operator Matt Putra describes the LTV to CAC ratio as the single health check metric for a direct-to-consumer business: the one number that tells you, in a single glance, whether the math behind your growth actually works. Signal LTV1 is what happens when a brand is scaling acquisition spend without ever calculating this number, and discovers too late that the ratio was below 2:1 the entire time.

What Is the LTV to CAC Ratio?

The LTV to CAC ratio compares the total revenue value a business expects to generate from a customer over their entire relationship (Lifetime Value, or LTV) against the cost of acquiring that customer in the first place (Customer Acquisition Cost, or CAC). It is expressed as a ratio (3:1, 4:1, and so on) representing how many dollars of lifetime value are generated for every dollar spent on acquisition.

This single number combines almost every other revenue signal in an ecommerce business. AOV, retention, churn, conversion rate, and acquisition efficiency all feed into it. A founder who knows their LTV to CAC ratio knows, at a glance, whether scaling ad spend will make the business healthier or accelerate a problem.

How to Calculate Your LTV to CAC Ratio

Step 1

Calculate LTV

LTV = Average Order Value x Purchase Frequency x Customer Lifespan x Gross Margin. Example: $85 AOV x 2.2 purchases/year x 2.5 years x 0.42 margin = $196.35.

Step 2

Calculate CAC

CAC = Total Acquisition Spend / New Customers Acquired. Example: $18,000 monthly spend / 360 new customers = $50 CAC.

Step 3

Divide LTV by CAC

Ratio = LTV / CAC. Example: $196.35 / $50 = 3.93:1: within the healthy 3:1 to 5:1 operating range.

"The LTV to CAC ratio is the single number a founder should know cold. If you cannot answer it in under five seconds, you do not yet know whether scaling your ad spend helps or hurts you." (Matt Putra, ecommerce operator)

What the Benchmarks Mean

Below 1:1

Losing money on every customer acquired

1:1 - 2:1

Marginal: inadequate return on acquisition spend

2:1 - 3:1

Low end of healthy: workable but tight

3:1 - 5:1

Healthy operating range for sustainable scaling

Above 5:1

May indicate underinvestment in growth

The 3:1 to 5:1 range is the framework popularized by ecommerce operator Andrew Faris as the sustainable scaling zone: high enough to fund growth and absorb the inevitable variance in performance, low enough that the business is not leaving acquisition opportunity on the table.

What Moves the LTV to CAC Ratio

On the LTV side: average order value (signals AOV1 through AOV4), retention and repeat purchase behavior (signals R1 through R4), and churn rate (signal R4) all directly increase the numerator. A brand that improves AOV from $70 to $85 and lifts purchase frequency from 1.8 to 2.2 times per year has increased LTV by more than 35 percent without touching acquisition at all.

On the CAC side: conversion rate problems (signals C1 through C6) inflate CAC because more ad spend is needed per resulting customer, and organic traffic (signal A5) reduces blended CAC by adding free acquisition volume alongside paid. Improving the ratio rarely requires cutting ad spend: it more often requires fixing what happens after the click.

Benchmarks to Know

3:1

Minimum healthy LTV to CAC ratio

4:1+

Sustainable scaling range

Below 2:1

Inadequate return on acquisition

$50

Example CAC for a $196 LTV (3.93:1)

2.5 yrs

Typical customer lifespan in LTV formula

42%

Example gross margin in LTV formula

Related Signals

LTV2

CAC Payback Period Too Long

LTV1 is the lifetime view: whether a customer eventually returns more than they cost to acquire. LTV2 is the cash flow view: how many months it takes to recover that CAC. A business can have a healthy LTV to CAC ratio and still run out of cash if the CAC payback period is too long.

Channel Dependency Risk

A low LTV to CAC ratio often gets masked by a single high-performing channel. When that channel saturates or costs rise, CAC increases across the board and the ratio that looked healthy on one channel collapses. Channel dependency risk and LTV to CAC ratio should be reviewed together.

Frequently Asked Questions

What to Do Next

If you have never calculated your LTV to CAC ratio, or you suspect it is below 3:1, having someone calculate it and identify which lever moves it fastest is the right decision.

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