LTV:CAC Ratio Calculator
Use this LTV:CAC calculator to divide customer lifetime value by acquisition cost and see how many times over a customer's value covers what it cost to win them.
LTV:CAC Ratio
3.00x
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LTV ÷ CAC
How to calculate LTV to CAC ratio
LTV:CAC ratio = Customer lifetime value (LTV) ÷ Customer acquisition cost (CAC)
- Get LTV for the customers you are measuring, ideally from the margin-adjusted model, and note which model you used.
- Get CAC for the same customers and period, with its cost scope (paid or fully loaded) written down.
- Divide LTV by CAC. The result is a multiple, written as 3.00x or 3:1.
$720 ÷ $240 = 3.00x
What is the LTV:CAC ratio
The LTV:CAC ratio compares what a customer is worth over the whole relationship with what it cost to acquire them. It is lifetime value divided by customer acquisition cost, shown as a multiple. A customer with an LTV of $720 who cost $240 to win gives a ratio of 3.00x. If the inputs hold, each dollar you spend on acquisition comes back three times over the customer's lifetime. Subscription and ecommerce businesses use it as a unit economics check.
The ratio is only as meaningful as the two numbers inside it. A revenue-based LTV and a margin-adjusted LTV give very different ratios for the same customer, because only one of them subtracts the cost of serving that customer. The same is true of CAC: a paid-only CAC makes the ratio look better than a fully loaded one. Work out each input separately with the LTV calculator and the CAC calculator so you know exactly what you are dividing.
A ratio above 1x only says the LTV you entered is larger than the CAC you entered. It does not prove the business is profitable, because overheads outside CAC still have to be paid, and it says nothing about timing. A 5x ratio built on a five-year lifespan can still leave you short of cash in year one. Read the ratio next to the CAC payback period for that reason.
Reading an LTV:CAC ratio of 3 and other values
The most quoted reference point comes from David Skok's SaaS metrics guide. It says the best SaaS businesses have an LTV to CAC ratio higher than 3, sometimes as high as 7 or 8, and calls these numbers only guidelines (For Entrepreneurs: SaaS Metrics 2.0). The table shows what each range means arithmetically and what to look at next. Use it as a starting point for your own analysis.
| Ratio | What it means arithmetically | What to check next |
|---|---|---|
| Below 1x | The customer is worth less than they cost to acquire | Pause scaling the channel and check whether CAC or LTV is mis-scoped |
| 1x to 3x | Value exceeds cost, with a thin cushion for overheads and error | Check payback and whether LTV is margin-adjusted |
| Around 3x | Value is three times the acquisition cost | Confirm with payback that cash comes back in time |
| Well above 3x | Value far exceeds cost | Check whether growth is underfunded or LTV is overstated |
An LTV:CAC ratio below 1 means each new customer loses money even before overheads. A very high ratio needs a second look too. It can mean LTV rests on an optimistic lifespan, or that the business could spend more on acquisition and grow faster while staying above its own target. The LTV:CAC formula is a single division, so every surprise in the result traces back to one of its two inputs.
Margin-adjusted LTV:CAC and other scope choices
Two teams can report different ratios for the same customers, because what goes into the ratio can vary. Before you compare your ratio across periods, channels or with another company, line up these choices:
LTV model: a margin-adjusted LTV:CAC compares gross profit with acquisition cost and is the stricter version. A revenue LTV gives a higher ratio for the same customer.
CAC scope: a fully loaded CAC includes salaries, tools and agencies. A paid CAC includes media only and raises the ratio.
Same customers: LTV and CAC should describe the same cohort or channel. An LTV modeled from older, loyal customers divided by the CAC of a new channel overstates that channel.
Same period: compare ratios built over the same time window, since CAC moves with seasonality and with competition in ad auctions.
When all four line up, the ratio is a fair comparison. Track it per channel as well as for the whole business, because a strong blended ratio can hide one channel that loses money on every customer.
When to use the LTV:CAC ratio
Use the LTV:CAC ratio to judge whether acquisition economics hold up over the full customer relationship. It also helps you compare channels or segments measured the same way, or set a ceiling on what you can afford to pay for a customer. Read it beside the payback period. The ratio shows how much value comes back, and payback shows how fast it comes back.
Where the LTV:CAC ratio misleads
Mismatched inputs move the ratio when nothing real has changed: a fully loaded CAC against a narrowly defined LTV, or a revenue LTV judged against a target that assumed margin. A recent cohort's CAC set against an LTV modeled from an older cohort does the same. The ratio also ignores timing, so a strong number built on a long lifespan can still strain cash.
Guides on this topic
Frequently Asked Questions
What is the LTV:CAC ratio?
The LTV:CAC ratio compares a customer's lifetime value with the cost of acquiring them. It is LTV divided by CAC, written as a multiple such as 3.00x or 3:1. A ratio of 3x means the customer is expected to bring in three times what was spent to win them, based on the LTV and CAC figures used. The ratio is only as good as its inputs, and it does not say how quickly the value arrives. That is the job of the CAC payback period.
What is the LTV:CAC ratio formula?
Divide LTV by CAC: LTV:CAC = LTV ÷ CAC. An LTV of $720 and a CAC of $240 give 720 ÷ 240 = 3.00x. Both inputs need to describe the same customers over a comparable period. An LTV modeled from one cohort divided by the CAC of another describes neither group. The LTV also needs a stated definition, since a revenue-based LTV and a margin-adjusted LTV divided by the same CAC give different ratios. Calculate each input first, with the LTV calculator and the CAC calculator, then divide.
What is a good LTV:CAC ratio?
One published reference point is a ratio of 3. It traces back to David Skok's SaaS metrics guide, which says the best SaaS businesses have a ratio above 3 and stresses that this is only a guideline. The right ratio for you depends on how LTV and CAC are defined, your margins, your growth strategy and how fast you need cash back. A company investing ahead of growth may accept a lower ratio for a while. A ratio built on revenue LTV cannot be judged against a target that assumed margin-adjusted LTV.
Which LTV should I use for the LTV:CAC ratio?
Use the margin-adjusted LTV when the ratio will drive spending decisions, because it compares the gross profit a customer leaves with what they cost. A ratio built on the simple, revenue-based LTV compares revenue with cost and comes out higher for the same customer. Both are legitimate as long as you know which one you have. The mistake is mixing them. One example is reading a revenue-based ratio as if it already covered cost of goods. Another is comparing a revenue-based ratio from one quarter with a margin-adjusted ratio from the next. Write the model next to the ratio every time.
Is the LTV:CAC ratio the same as ROI?
They are related and measure different things. ROI compares the profit from an investment with its cost, usually as a percentage: (gain − cost) ÷ cost. The LTV:CAC ratio compares lifetime value with acquisition cost as a multiple. If LTV is revenue-based, the ratio is closer to a lifetime ROAS than to profit. With a margin-adjusted LTV you can turn it into an approximate acquisition ROI: a 3x ratio means gross profit of three times CAC, so the return over CAC is 200%. Neither figure accounts for overheads outside CAC or for how long the money takes to come back.
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