Customer acquisition cost (CAC) is what you spend on sales and marketing to win one new customer, calculated as total sales and marketing spend divided by the number of new customers that spend acquired in the same period. In B2B and SaaS it is also called cost per customer acquisition or the cost of acquiring a customer. In mobile and app marketing, user acquisition cost usually means the cheaper cost per install, not this fully loaded per-customer figure. It is the denominator behind every unit-economics question you have: whether a channel pays back, whether you can afford to scale spend, and whether the business gets more profitable as it grows or less. It is the cost side of customer acquisition, the number every channel ultimately answers to.
How to calculate customer acquisition cost (formula and example)
Worked example: last quarter you spent $90,000 across sales and marketing and closed 75 new customers. $90,000 / 75 = $1,200 CAC. That is the live calculator's default, so change the two inputs above and the number moves with you. The figure is only as honest as the spend you feed it: skip the headcount and tools and you get a flattering number that falls apart the moment finance loads the real costs.
Two flavours are worth separating. Blended CAC divides total spend by every new customer, paid and organic alike, and it is the number most benchmark reports quote. Paid CAC divides only your paid-channel spend by the customers that channel produced, and it is the one that tells you whether to pour more budget into a campaign. A low blended CAC propped up by free word of mouth can hide a paid channel that loses money on every signup.
CAC on its own is half an answer. The other half is what a customer is worth, so read it next to lifetime value and the LTV:CAC ratio. A $1,200 CAC is cheap for a customer who pays you $20,000 over their life and ruinous for one who churns at $300.
Customer Acquisition Cost (CAC) benchmarks by industry
| Industry | Median | Good | Great |
|---|---|---|---|
| SaaS | $900 | $450 | $200 |
| Fintech | $1,450 | $800 | $400 |
| Dev Tools | $700 | $400 | $180 |
| AI/ML* (estimate) | $650 | $350 | $180 |
| E-commerce | $250 | $120 | $50 |
| Healthtech | $950 | $550 | $280 |
| Martech | $600 | $320 | $150 |
These bands come from First Page Sage's 2026 CAC by Industry study (B2B edition), which puts blended fintech SaaS CAC near $1,450, medtech around $921, software development at $720, adtech at $560, and e-commerce SaaS near $274. The spread tracks sales complexity: regulated, high-trust buying like fintech and healthtech costs the most to win, while consumer-adjacent e-commerce costs the least. There is no clean AI/ML row in that study, so treat the AI/ML band here as a careful estimate sitting between dev tools and broad SaaS, not a sourced figure. Stage matters too, so Benchmarkit's 2025 SaaS metrics report found the median company now spends about $2.00 in sales and marketing for every $1.00 of new customer ARR, with the bottom quartile near $2.82, the worst efficiency in years.
How to bring CAC down
The fastest lever is usually not a cheaper channel, it is a higher conversion rate on the traffic you already pay for. Halve the leak between signup and activation and you halve CAC without touching the ad budget, which is why the metric belongs next to your conversion rate and cost per lead on the same dashboard.
- Fix activation before spend. If new users do not reach value, every dollar of acquisition leaks straight back out as early churn. Cheaper than any channel optimisation.
- Lean on channels that compound. Referrals, organic search, and content carry a near-zero marginal CAC once they are running. First Page Sage's blended CAC is roughly 75% organic for that reason.
- Cut payback to free up cash. A lower CAC shortens the months it takes to earn the customer back. Track it with the CAC payback period calculator.
Frequently asked questions
What is a good customer acquisition cost (CAC)?
There is no single good number; CAC only makes sense against industry and lifetime value. Blended B2B SaaS CAC runs roughly $900 at the median, dropping toward $200 for the most efficient companies, while regulated fintech and healthtech sit near $1,450 and e-commerce can come in under $300. The honest test is the LTV:CAC ratio: aim for at least 3:1, meaning a customer is worth three times what you paid to win them, and a CAC payback period under 12 months.
How do you calculate CAC?
Add up all sales and marketing spend in a period, including salaries, ad budget, agency fees, and tools, then divide by the number of new customers you won in that same period. If you spent $90,000 and closed 75 customers, your CAC is $1,200. Use the same window for both numbers so spend and customers line up.
What is the difference between CAC and CPA?
CAC counts the cost of winning a paying customer; cost per acquisition (CPA) usually counts the cost of a lighter action like a signup, lead, or trial. CAC sits at the bottom of the funnel and is always higher, because only some of the signups CPA pays for ever convert to paying customers.
Should CAC include salaries?
Yes. A fully loaded CAC includes the salaries and overhead of everyone in sales and marketing, not just media spend. Ad-only CAC looks great on a slide and falls apart the moment you account for the team running the campaigns, which is why most benchmark reports quote the loaded figure.
What is cost per customer acquisition?
Cost per customer acquisition is another name for customer acquisition cost (CAC): total sales and marketing spend divided by the new paying customers it won. The two terms are interchangeable, so a cost per customer acquisition calculator and a CAC calculator do the same job.
Does improving retention lower CAC?
The per-customer formula does not move, but the economics around it do. Winning a new customer costs roughly 5 to 7 times more than keeping one (HBR), so the cheapest acquisition is often the customer you do not lose. Better retention also fuels referrals and word of mouth, the channels that carry a near-zero marginal CAC, so a stickier product quietly pulls your blended acquisition cost down over time even when the per-customer math holds steady.
