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Metrics7 min read

What is a good LTV to CAC ratio? How to read yours

A good LTV to CAC ratio is above 3 to 1. Where the rule comes from, the formula, why it needs a gross margin check, and why payback matters more.

A raccoon compares acquisition cost and customer lifetime value on a brass scale beside a 3:1 card.
Key takeaway

The common guideline is an LTV to CAC ratio above 3 to 1: each customer returns at least three times what it cost to win them. Treat it as a rule of thumb, not a law. Check which LTV formula the benchmark assumes, pair the ratio with CAC payback in months, and remember that early LTV is a forecast built on very little data.

A good LTV to CAC ratio is above 3 to 1: each customer should bring in at least three times what it cost to acquire them. The guideline comes from David Skok’s SaaS Metrics 2.0. Below it, acquisition eats too much of the value each customer creates. Far above it, you may be growing slower than you could afford to.

LTV to CAC ratio benchmarks

LTV to CAC ratioBelow 1 to 1
What it usually meansEach customer costs more than they return. Stop scaling the channel.
LTV to CAC ratio1 to 1 up to 3 to 1
What it usually meansProfitable per customer, but little room for overheads. Common early on.
LTV to CAC ratioAround 3 to 1
What it usually meansThe usual target. Acquisition and the rest of the business can both be paid for.
LTV to CAC ratioWell above 5 to 1
What it usually meansOften a sign you could spend more on growth, or that LTV is overstated.

Run your own numbers in the LTV calculator. It shows the ratio and the payback period side by side.

LTV to CAC ratio formula

  1. 1Lifetime value. Average monthly revenue per customer x gross margin / monthly churn rate.
  2. 2Customer acquisition cost. Sales and marketing spend in a period / new customers won in that period.
  3. 3Ratio. LTV / CAC.

A worked example: a $40 a month plan with an 80% gross margin earns $32 of gross profit a month. With 4% monthly churn, the average customer stays 25 months, so LTV is $800. If you spent $250 to win each customer, the ratio is 3.2 to 1.

The churn rate drives everything. Cut monthly churn from 4% to 3% and the same customer is worth about $1,067, a 33% jump, without touching price or acquisition. Measure it properly with the churn rate calculator.

LTV to CAC ratio for SaaS: check the gross margin

The guideline is easy to misapply because people compute LTV in different ways. Skok notes that his 3 to 1 assumes the simpler LTV formula without a gross margin adjustment, and a business with gross margins of 80% or higher.

If you calculate LTV on gross profit, as you should, an 80% margin business at 2.4 to 1 is roughly where the revenue-based 3 to 1 would put it. With lower margins from AI model costs, human onboarding, or fees on small plans, the revenue version flatters you badly. a16z goes further and bases LTV on contribution margin, because a revenue or gross margin LTV suggests a higher ceiling on acquisition spend than you really have. Whenever you quote the ratio, say which LTV you used.

CAC payback: the number that keeps you alive

A healthy ratio says a customer is worth winning eventually. It says nothing about when you get your money back. Months to recover CAC answers that:

CAC payback (months) = CAC / (monthly revenue per customer x gross margin)

In the example above, $250 / $32 is just under 8 months. Skok’s original guideline was to recover CAC in under 12 months. He has since written that well-funded enterprise companies with a land and expand model can work at around 20 months, but that guideline assumes you can raise the capital to cover the gap.

For a bootstrapped founder, payback is often the more important number. A 4 to 1 ratio with a 24-month payback means two years of cash out before a customer pays for themselves. If you are funding growth from revenue, aim for the shortest payback you can, and prefer channels that pay back inside a few months.

Why your early LTV to CAC is probably wrong

  • Lifetime is a forecast. With six months of history, a 25-month lifetime is an extrapolation. a16z suggests that with only a few months of data, the conservative move is to measure realized value to date, such as 12-month and 24-month LTV, instead of predicting a full lifespan.
  • Churn from a small sample swings wildly. Two cancellations out of 40 customers is 5% one month and 0% the next. Average several months.
  • Early CAC can be too high. Skok points out that early teams carry salaries meant to support far more customers, and suggests counting only a portion of them until you are at scale. The opposite also happens: unpaid founder hours make CAC look lower than it is.
  • Your first customers are not your future customers. Friends, followers, and launch-day fans often churn less and cost less than strangers from a paid channel.

What to do when your ratio is too low

  1. 1Fix churn before spending more. It has the largest effect on LTV, and it usually points to an onboarding or fit problem a bigger budget would only amplify.
  2. 2Check the price. Many early products are underpriced. A price change moves LTV directly. Our pricing guide covers how to test it.
  3. 3Cut the worst channel, not all of them. Blended numbers hide one expensive channel behind a cheap one. Compare CAC per channel, then drop the outlier.
  4. 4Add expansion revenue. Seats, usage tiers, and annual plans raise revenue per customer over time.

Is a high LTV to CAC ratio good?

Sometimes. In an early product a 10 to 1 ratio more often means LTV is inflated by an uncapped lifetime, CAC leaves out your own time, or only free channels are running. If the number survives those checks, test a paid channel with its own tracked link and see whether the economics hold at scale. The paid ads guide covers how to run that test.

Frequently asked questions

What is a good LTV to CAC ratio for SaaS?

The common guideline is above 3 to 1, from David Skok’s SaaS Metrics 2.0. That figure assumes a revenue-based LTV and gross margins of 80% or more, so check how your LTV is calculated before comparing.

Is an LTV to CAC ratio of 5 to 1 good?

Usually, as long as the inputs are honest. A very high ratio can also mean LTV is overstated by an uncapped lifetime or CAC is missing costs, so verify both before deciding to spend more.

What is a good CAC payback period?

The traditional guideline is under 12 months. Venture-funded enterprise companies sometimes run around 20 months, but a bootstrapped company paying for growth from revenue should aim much shorter.

Should LTV use revenue or gross profit?

Gross profit at minimum, and contribution margin if you can measure it. Revenue-based LTV ignores the cost of serving each customer and overstates what you can afford to spend on acquisition.

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