What is the LTV:CAC Ratio?

The LTV:CAC ratio compares the lifetime value of a customer to the cost of acquiring that customer. It is a key SaaS metric because it shows how efficiently you are buying growth.

Tracking the ratio over time reveals trends in acquisition efficiency. You can then adjust where and how you spend to improve profitability.

How is the LTV:CAC ratio calculated?

The formula for LTV : CAC is Lifetime Customer Value, divided by Customer Acquisition Cost, as shown below.

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How do SaaS companies use the LTV:CAC ratio?

SaaS companies use the LTV:CAC ratio in four main ways.

Setting sales and marketing budgets

A high LTV:CAC ratio means you acquire customers cheaply and those customers are valuable. That is a signal you can safely spend more on growth.

Optimising sales and marketing channels

Calculate the ratio for each channel or campaign. Then move budget towards the channels that bring in valuable customers most efficiently.

Determining pricing strategies

Comparing lifetime value against customer acquisition cost shows the return on your acquisition spend. That return tells you whether your pricing works.

Forecasting revenue

Lifetime value and the LTV:CAC ratio make revenue projections more accurate. Both help you plan future growth with fewer assumptions.

What is a good LTV:CAC result?

There is no single good LTV:CAC result for every business. The right ratio depends on your industry, your target market and your cost of delivery.

As a guide, a ratio of 3:1 or higher is usually considered strong. It means each customer returns at least three times what it cost to win them.

A low ratio points to one of two problems. Either you are spending too much to acquire customers, or the customers you win are not valuable enough. Both call for a review of your sales and marketing approach.

The aim is to acquire valuable customers at the lowest sensible cost. Tracking the ratio over time shows whether you are moving in the right direction.

How to calculate the LTV:CAC ratio

To calculate the LTV:CAC ratio you need two inputs, and both need defining before the arithmetic matters.

Customer lifetime value (LTV) is usually average revenue per account multiplied by gross margin, divided by the churn rate. Using gross margin rather than revenue is what makes the figure comparable across business models: a company delivering at 80% margin genuinely earns more per customer than one at 40%, even on identical revenue.

Customer acquisition cost (CAC) is total sales and marketing spend divided by new customers won in the same period. The CAC calculation should include salaries and commission, not only advertising.

Worked through: a SaaS business with £500 average annual revenue per account, 75% gross margin and a 20% annual churn rate has an LTV of (£500 × 0.75) / 0.20 = £1,875. If CAC is £600, the LTV:CAC ratio is 3.1:1.

Why retention moves the ratio more than acquisition

The churn rate sits in the denominator of lifetime value, which makes it the most powerful single input. Improving the retention rate from 80% to 90% halves the churn rate and doubles LTV, without changing customer acquisition cost at all.

That is why customer acquisition strategies aimed purely at volume tend to disappoint over the long term. Winning more customers who then leave quickly pushes CAC up and LTV down at the same time. Improving onboarding, support and product fit moves the ratio in both directions at once.

Reading the ratio across different business models

A good ratio is not universal. Self-serve products at low price points can sustain a lower ratio because payback is fast and the CAC calculation is dominated by marketing rather than sales headcount. Enterprise business models carry long sales cycles and high customer acquisition cost (CAC), so they need a higher ratio and a longer view to justify the spend.

Judge the ratio against your own trend and your gross margin profile, rather than against a headline figure from a very different kind of company.

LTV:CAC Visualisation Example

This chart is an example of the monthly LTV:CAC ratio over time compared to budget, making it much easier to understand trends, improvements, even seasonality.

ScaleXP fully automates LTV / CAC ratios with easy customisation of definitions as well as instant links to your finance systems, allowing instant visualisation of all your data and KPIs as well as automated revenue recognition and analysis. Click here to learn more.

See how the ratio fits alongside the rest of your reporting in ScaleXP’s SaaS metrics software.

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