# LTV:CAC Ratio

_Also known as: LTV to CAC, LTV/CAC_

**Category:** Metrics
**URL:** https://skiporship.com/glossary/ltv-cac-ratio
**Last updated:** 2026-08-08

## Definition

The LTV:CAC ratio compares the lifetime gross profit of a customer to the cost of acquiring them, showing how many times over each customer repays their acquisition cost. Around 3:1 is the common health benchmark.

## What it means in practice

The LTV:CAC ratio condenses whether a business model works into a single number. Below 1:1 you lose money on every customer and growth accelerates the losses. Around 3:1 is widely treated as healthy: enough margin above acquisition cost to fund the rest of the business.

An unusually high ratio is not automatically good news. A ratio of 8:1 often means underinvestment in growth — the unit economics could support far more acquisition spend than is being deployed, and a competitor willing to spend into a 3:1 ratio can take the market while you optimise for efficiency.

The ratio inherits every weakness of its inputs. Because LTV is a projection built on churn assumptions and CAC is routinely understated by excluding salaries, a reported 4:1 can easily be a real 1.5:1. It is worth recalculating both inputs honestly before trusting the result.

## Formula

```
LTV:CAC = customer lifetime value ÷ customer acquisition cost
```

The ratio is only as trustworthy as its inputs. Understated CAC and optimistic churn can turn a 1.5:1 business into a reported 4:1.

## Worked example

Comparing two products with identical revenue but different economics.

- Product A: LTV £2,000, CAC £900 → ratio 2.2:1.
- Product B: LTV £2,000, CAC £400 → ratio 5:1.
- Product A recovers acquisition cost slowly and has little headroom.
- Product B could profitably double acquisition spend and still stay above 3:1.

**Takeaway:** Product B is not just more efficient — it has room to buy growth that Product A does not, which usually decides who wins the segment.

## Common mistakes

- Treating a very high ratio as unambiguously good rather than as possible underinvestment in growth.
- Comparing ratios across companies that calculate LTV and CAC differently.
- Trusting the ratio without checking whether CAC includes salaries and churn is observed.
- Optimising the ratio by cutting acquisition spend, which improves the number while shrinking the business.

## Related tool

[CAC and LTV:CAC calculator](https://skiporship.com/calculators/cac)

## Related terms

- [Customer Acquisition Cost](https://skiporship.com/glossary/customer-acquisition-cost) — Customer acquisition cost (CAC) is the total sales and marketing spend required to win one new paying customer, calculated by dividing all acquisition costs in a period by the number of customers acquired in that period.
- [Customer Lifetime Value](https://skiporship.com/glossary/customer-lifetime-value) — Customer lifetime value (LTV) is the total gross profit you expect to earn from a single customer across the whole of their relationship with you, before the cost of acquiring them.
- [CAC Payback Period](https://skiporship.com/glossary/payback-period) — CAC payback period is the number of months it takes for the gross profit from a customer to repay the cost of acquiring them — the point at which that customer stops being a loss.
- [Unit Economics](https://skiporship.com/glossary/unit-economics) — Unit economics are the direct revenues and costs associated with a single unit of your business — usually one customer — showing whether each one is profitable before overheads.

## FAQ

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

Around 3:1 is the standard benchmark. Below 1:1 the business loses money on every customer. Above roughly 5:1 often signals underinvestment in growth rather than exceptional health.

**Can the LTV:CAC ratio be too high?**

Yes. A very high ratio usually means you could profitably spend far more on acquisition than you are. Competitors willing to operate nearer 3:1 can take market share while you optimise for efficiency.

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