# What is LTV:CAC?

> LTV:CAC compares customer lifetime value with customer acquisition cost to estimate whether a SaaS acquisition channel creates enough value to justify its cost.

Canonical page: [https://attribiq.com/guides/what-is-ltv-cac](https://attribiq.com/guides/what-is-ltv-cac)

Category: Goals & Funnels

Last updated: 2026-06-25

Topics: ltv cac, customer lifetime value, cac, saas metrics

## Summary

LTV:CAC compares customer lifetime value with acquisition cost. It is useful for judging channel quality, but it depends heavily on retention, margin, attribution, and how you calculate lifetime value.

## What this guide covers

- Define LTV:CAC
- Understand why the ratio matters
- Avoid common LTV:CAC mistakes
- Segment LTV:CAC by acquisition source

LTV:CAC compares customer lifetime value with customer acquisition cost.

It is usually written as a ratio:

```txt
LTV:CAC = customer lifetime value / customer acquisition cost
```

If a customer is worth EUR 900 over their lifetime and costs EUR 300 to acquire, the LTV:CAC ratio is 3:1.

## Why LTV:CAC matters

The ratio helps answer whether acquisition is economically healthy.

If a channel costs more to acquire customers than those customers are likely to return, growth can become expensive even when signups increase. If a channel creates customers with strong retention and expansion, it may deserve more investment even if upfront CAC is higher.

## Lifetime value assumptions

Lifetime value depends on assumptions such as:

- Average revenue per account.
- Gross margin.
- Customer lifetime.
- Churn rate.
- Expansion revenue.
- Contraction revenue.
- Refunds.

Because these assumptions can be uncertain, LTV:CAC should be treated as a decision metric, not a precise truth.

## Why blended LTV:CAC can hide problems

A blended ratio across the whole business can look healthy while one campaign is weak.

For example, organic search may create customers with long retention while a paid social campaign creates customers who churn quickly. A blended number can hide the difference.

Segment LTV:CAC by:

- Source.
- Campaign.
- Landing page.
- Plan.
- Country.
- Customer type.
- Cohort.

## LTV:CAC and attribution

Attribution helps connect the ratio to the source that created the customer.

To calculate source-level LTV:CAC, you need:

1. Acquisition cost by source or campaign.
2. Customers attributed to that source.
3. Revenue and retention for those customers.
4. Refund, churn, and expansion events.

This is why LTV:CAC depends on reliable checkout and payment attribution.

## Next steps

Read [what customer acquisition cost is](https://attribiq.com/guides/what-is-customer-acquisition-cost) first if you need the CAC side of the ratio. Use [MRR attribution](https://attribiq.com/guides/what-is-mrr) and [churn attribution](https://attribiq.com/guides/what-is-churn) to understand customer quality after acquisition.

## Frequently asked questions

### What does LTV:CAC mean?

LTV:CAC is the ratio between customer lifetime value and customer acquisition cost.

### What is a good LTV:CAC ratio?

Benchmarks vary. Many SaaS teams treat 3:1 as a useful reference point, but the right target depends on margin, payback period, growth stage, and retention.

### Why can LTV:CAC be misleading?

The ratio depends on assumptions about lifetime value, churn, gross margin, and attribution. Small changes in those assumptions can change the result.

### Should LTV:CAC be segmented?

Yes. Segment by source, campaign, plan, customer type, and cohort. A blended ratio can hide weak channels and strong niches.