What is customer acquisition cost?
Customer acquisition cost (CAC) is what you spend, on average, to win one new paying customer.
Not a lead. Not a demo. A customer who pays you.
It is the number that decides whether growth makes you richer or just busier. And it is the number most often fudged.
The CAC formula: blended vs paid
The CAC formula is CAC = total sales and marketing costs / new customers, with costs and customers from the same period.
There are two versions worth tracking, and you need BOTH:
- Paid CAC = ad spend / customers from paid ads. Tells you if the ads work.
- Blended CAC = (ads + other marketing + sales) / all new customers. Tells you if the business works.
Worked example, using the sample numbers in the calculator:
| Metric | Math | Result |
|---|---|---|
| Paid CAC | $20,000 / 15 | $1,333 |
| Marketing CAC | ($20,000 + $8,000) / 25 | $1,120 |
| Blended CAC | $50,000 / 25 | $2,000 |
| Months to recover | $2,000 / $1,000 | 2 months |
Report only paid CAC and this business looks like a $1,333 customer. Load in sales and it is $2,000. That 50% gap is where budgets go to die.
What goes into CAC, and what people leave out
Fully loaded CAC includes every cost of getting a new customer to sign, and nothing that happens after.
| Include | Leave out |
|---|---|
| Ad spend on every channel | Onboarding and implementation |
| Agency and freelancer fees | Customer success and account management |
| Marketing tools and pay | Product and hosting costs |
| Sales pay and commissions | Upsells to existing customers |
The usual cheat? Leaving out sales salaries. If a human has to get on a call to close the deal, that human is part of acquiring the customer.
B2B SaaS CAC benchmarks
Per First Page Sage's B2B CAC report, updated November 4, 2026, combined average CAC is $243 for B2B SaaS.
| Industry | Organic CAC | Inorganic CAC | Combined |
|---|---|---|---|
| B2B SaaS | $205 | $357 | $243 |
| Construction | $212 | $509 | $287 |
| Legal Services | $584 | $1,303 | $764 |
| Financial Services | $644 | $1,258 | $798 |
Source: First Page Sage, "Average Customer Acquisition Cost (CAC) By Industry: B2B Edition" (updated November 4, 2026). The combined figure is weighted 75% organic and 25% inorganic, firstpagesage.com.
Compare like with like. A benchmark weighted toward organic will look far cheaper than a paid, sales-led motion with a full team behind it.
How to lower CAC without starving growth
You lower CAC by getting more customers out of the same spend, not by cutting the spend that works.
- Fix cost per held call first. Every customer starts as a held sales call. Cheaper held calls mean cheaper customers.
- Book inside the funnel. Our 7-question quiz funnel takes about 30 seconds and puts the calendar INSIDE it.
- Stop paying reps to chase ghosts. Qualify before the calendar so sales time goes to buyers.
- Judge channels on customers. Not CPL. Not MQLs.
It is the same system behind 100+ booked sales calls a month for SaaS clients, and clients scaled from $10K to $100K+ MRR.
Now check whether that CAC pays back with the LTV to CAC ratio calculator, see the ad side with the ROAS calculator and cost per lead calculator, or read the cost per held call guide and our SaaS lead generation page.
Questions
What is the CAC formula?
CAC = total sales and marketing costs / new customers, both from the same period. If you spent $30,000 on ads, marketing and sales and won 15 new customers, your CAC is $2,000.
What is the difference between blended CAC and paid CAC?
Blended CAC divides all sales and marketing costs by every new customer, including referrals and organic. Paid CAC divides only ad spend by the customers those ads produced. Paid CAC tells you if the ads work. Blended CAC tells you if the business works.
What is a good CAC for B2B SaaS?
Per First Page Sage's 2026 B2B report, combined average CAC for B2B SaaS is $243, weighted toward organic. A good CAC is one you earn back quickly. Check it against lifetime value with an LTV to CAC ratio, where 3:1 is the classic floor.
Should CAC include sales salaries?
Yes, for blended or fully loaded CAC. If a rep has to get on a call to close the deal, their pay and commission are part of what the customer cost. Leaving them out makes CAC look better than it is.
How often should I calculate CAC?
Monthly is enough for most B2B companies. If your sales cycle runs longer than a month, use a trailing three-month window so the spend and the customers it produced land in the same period.