What is LTV:CAC Ratio?

The LTV:CAC ratio compares the gross profit a customer brings in over their lifetime (LTV) with the sales and marketing cost of winning them (CAC), and shows whether a company’s growth pays for itself.

At a glance

• Formula: LTV:CAC = customer lifetime value ÷ customer acquisition cost.
• David Skok’s widely used rule of thumb is that LTV should be at least 3x CAC.
• Read it with CAC payback. Skok’s guideline is to recover CAC in under 12 months.
• The number only means something once you have a repeatable way to sell.
• Calculate it by customer segment, not as one blended figure.

How to calculate the LTV:CAC ratio

Start with LTV. For a subscription business, a customer’s average lifetime in months is 1 ÷ monthly churn rate. Multiply the average monthly revenue per account by your gross margin and by that lifetime.

Then CAC: total sales and marketing cost for a period, including salaries, tools and programs, divided by the number of new customers won in that period. Skok separates a program-only CAC from a fully loaded one, and for any sale that needs a rep, the fully loaded figure is the one to use.

Example (illustrative):

• Average revenue per account: $2,000 a month, at 70% gross margin, so $1,400 of gross profit a month.
• Monthly churn: 2%, so the average customer stays 50 months.
• LTV: $1,400 × 50 = $70,000.
• CAC: $450,000 of sales and marketing cost in a quarter ÷ 30 new customers = $15,000.
• LTV:CAC: $70,000 ÷ $15,000 = about 4.7:1. Payback: $15,000 ÷ $1,400 = about 11 months.

If churn doubled to 4% a month, lifetime would fall to 25 months, LTV to $35,000 and the ratio to about 2.3:1, with nothing else changing. That’s why churn moves this number more than almost anything a sales team does.

LTV:CAC benchmarks

The 3:1 floor comes from David Skok of Matrix Partners, whose SaaS Metrics guide says LTV must be at least 3x CAC and that the best SaaS businesses run higher, sometimes 7 or 8. It’s a rule of thumb from a venture investor, not a survey result.

For what acquisition actually costs, Benchmarkit’s 2025 B2B SaaS Performance Metrics report put the median new customer CAC ratio at $2.00 of sales and marketing spend per $1.00 of new customer ARR in 2024, up 14% on the year before, and found median CAC payback up 12.5% since 2022. Both vary a lot by contract size, so compare yourself with companies at a similar ACV.

Common LTV:CAC mistakes

• Calculating it too early. Skok and Jared Sleeper wrote that LTV:CAC is only reliable once growth is repeatable. Deals a founder closes personally tell you little about what a new rep will cost.
• Blending segments. Enterprise and SMB accounts have different CAC, contract values and churn. One average hides which segment makes money.
• Leaving people out of CAC. Counting ad spend but not salaries and tools makes a high-touch sale look cheap.
• Reading the ratio without payback. A 4:1 ratio with a 30-month payback can still run a company out of cash.
• Treating a very high ratio as good news. Sleeper’s point is that if the unit economics work, holding back sales and marketing spend leaves growth to competitors.

How LTV:CAC shows up in a revenue system

CAC is one of the numbers a partner sees from the teams we run, next to meetings held, pipeline and close rate. DigitalOcean needed a regional outbound team inside its own commercial organization. We hired, trained and ran it, and CAC came in 37% lower. Read the DigitalOcean story.

Terms that sit next to LTV:CAC

The two halves of the ratio are customer lifetime value and CAC, and the cash view of the same question is the CAC payback period. LTV rises and falls with churn rate and net revenue retention, and benchmarks are best compared at a similar annual contract value.