A good CAC to LTV ratio for B2B sales teams is 1:3, meaning each customer generates roughly three times what it costs to acquire them. Ratios below 1:1 signal you're losing money on acquisition, while ratios above 1:5 often mean you're underinvesting in growth and leaving pipeline on the table.
Most people write the ratio as LTV:CAC, so the healthy target reads as 3:1. Either way, the math is the same: customer lifetime value should be about three times the cost to win that customer.
What CAC and LTV actually mean
Before tuning the ratio, get the two inputs right. Most teams get this wrong by sloppily defining one or both.
Customer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers won in the same period.
CAC = (Sales spend + Marketing spend) / New customers acquired
Include SDR and AE salaries, commissions, ad spend, tooling, and the marketing team's fully loaded cost. Leaving out salaries is the most common way teams flatter their numbers.
Lifetime Value (LTV) is the total gross profit you expect from a customer across the entire relationship.
LTV = (Average revenue per account x Gross margin %) / Churn rate
Use gross margin, not raw revenue. A customer paying $50k/year at 80% margin isn't worth $50k to you — they're worth $40k in contribution.
Why 3:1 is the benchmark
The 3:1 LTV:CAC rule comes from SaaS investor playbooks and has held up across thousands of companies. The logic is simple:
- Below 1:1 — you spend more to acquire a customer than they're worth. Unsustainable.
- 1:1 to 3:1 — viable but tight; you may not be pricing or retaining well enough.
- Around 3:1 — healthy unit economics with room to fund growth.
- Above 5:1 — you're profitable per deal but probably under-spending on sales and marketing, so competitors can outgrow you.
David Skok's widely cited SaaS metrics framework popularized both the 3:1 ratio and the companion benchmark below.
