Value Metric
Customer Acquisition Cost (CAC)
Customer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers won in a period.
What is Customer Acquisition Cost (CAC)?
Customer Acquisition Cost (CAC) measures how much you spend, on average, to acquire a single new paying customer. It rolls up every dollar of sales and marketing investment — ad spend, salaries, tooling, agency fees, and commissions — over a period and divides it by the number of new customers won in that same window.
CAC is the counterweight to lifetime value. On its own it tells you whether a channel is affordable; paired with LTV and payback period it tells you whether your growth engine is actually profitable and how fast it compounds.
How to calculate it
CAC = Total Sales & Marketing Spend ÷ New Customers Acquired
- Sales & Marketing Spend
- All acquisition costs in the period (ads, salaries, tools, commissions)
- New Customers Acquired
- Count of first-time paying customers won in the same period
Worked example
If you spend $50,000 on sales and marketing in a quarter and acquire 250 new customers, your CAC is $50,000 ÷ 250 = $200 per customer.
What good looks like
- Healthy LTV:CAC ratio3:1 or higher
Lifetime value should be at least three times the cost to acquire; below 1:1 you lose money on every customer.
Source: OpenView — SaaS Benchmarks
- CAC payback< 12 months
Efficient SaaS recovers acquisition cost within a year; best-in-class is under 6 months.
Why it matters
CAC is the single clearest signal of whether growth is sustainable. When CAC creeps above the value a customer returns, every new sale digs the hole deeper — you can grow revenue and still go broke. Watching CAC by channel shows where to reinvest and where to cut, and improving the activation and onboarding steps that turn signups into paying customers lowers CAC without touching ad budgets.
How to improve Customer Acquisition Cost (CAC)
Raise signup-to-paid conversion
A better onboarding and activation flow means more of the traffic you already pay for converts, which mechanically lowers CAC. Test friction points before spending more on the top of the funnel.
Interview churned and won-but-slow customers
Qualitative research surfaces the objections and confusion that inflate acquisition cost, so you can fix messaging and product gaps rather than paying to overcome them.
Double down on your lowest-CAC channels
Break CAC out per channel and shift budget toward the ones with the strongest payback instead of averaging spend across all of them.
Frequently asked questions
What is a good customer acquisition cost?
There is no universal number — "good" CAC is relative to lifetime value. Aim for an LTV:CAC ratio of at least 3:1 and a payback period under 12 months. A $500 CAC is excellent for enterprise software and disastrous for a $5/month consumer app.
What costs should be included in CAC?
Include every fully-loaded acquisition cost in the period: paid media, salaries and commissions for sales and marketing staff, martech and sales tooling, agency and contractor fees, and creative production. Excluding salaries is the most common way teams flatter their CAC.
How is CAC different from CPA?
Cost per acquisition (CPA) usually measures the cost of a lower-funnel action such as a signup or lead, while CAC measures the cost of a new paying customer. CAC is the truer profitability metric because it accounts for conversion all the way to revenue.