What is the CAC Calculator?
The CAC Calculator computes your Customer Acquisition Cost the total sales and marketing spend divided by the number of new customers acquired. CAC is a foundational SaaS metric used alongside LTV to evaluate unit economics and growth efficiency.
How does it work?
Enter your total monthly spend on sales salaries, marketing ads, tools, and commissions. Enter the number of new customers acquired in the same period. The calculator divides spend by customers to produce your cost per acquisition.
Formula
acquisition spend / new customers
How the calculation works
How the calculation works
- 1Start with total sales and marketing spend for the period, including salaries and tools.
- 2Count new customers acquired in that same period.
- 3Divide spend by the number of new customers.
- 4The result is your cost per acquisition.
Worked example
Worked Example
Flowstack, a fictional B2B SaaS company, spent $40,000 in a month on ads, content, sales salaries, and CRM tools, and acquired 120 new customers in that same month. It wants to know its cost per customer.
- 1Divide total spend by new customers: 40000 / 120 = 333.33
- 2Flowstack spends about $333.33 to acquire each new customer
- 3With an LTV of $3,690, that is an 3690 / 333.33 = 11.1x LTV:CAC ratio
Result
Flowstack has a CAC of $333.33 per new customer, comfortably inside the efficient range for self-serve and SMB SaaS.
Interpretation guide
How to read your result
Typical for product-led, self-serve SaaS where customers sign up without sales contact.
Safely scale spend on the channels producing this CAC while monitoring payback.
The normal range for SMB SaaS with inside sales teams and lower-priced contracts.
Validate the CAC against LTV: it only works if payback stays under 12 months.
Expected for mid-market deals with longer sales cycles and larger contract values.
Ensure ACV and retention justify the cost; segment CAC by deal size to confirm efficiency.
Typical for enterprise sales with large teams and long cycles, justified only by large contracts.
Track pipeline win rates and ACV closely; one weak quarter can blow up enterprise CAC fast.
Benchmarks
CAC benchmarks by go-to-market segment
| Metric | Typical | Strong |
|---|---|---|
| Self-serve B2B SaaS | Under $500 | Under $200 |
| SMB sales-led | $1,000-5,000 | Under $1,500 |
| Mid-market | $5,000-15,000 | Under $8,000 |
| Enterprise | $15,000-50,000+ | Under $30,000 |
| Consumer app | $5-50 | Under $10 |
Common mistakes
- - Including brand-building spend that doesn't drive immediate acquisition
- - Using trailing customer counts from periods before spend was incurred
- - Not separating new customer CAC from expansion revenue CAC
Practical tips
Practical tips
Include every acquisition cost: ad platforms, sales salaries, commissions, content production, CRM tools, and agency fees.
Count only new customers in the same period as the spend; matching the wrong time windows distorts CAC.
Calculate CAC per channel and per segment; blended CAC hides that one channel is subsidizing another.
Judge CAC against payback: divide CAC by monthly gross profit per customer to find how many months to break even.
Watch CAC trends quarterly; rising CAC with flat LTV is the earliest warning sign of growth trouble.
Do not include brand-building spend that does not drive this period's acquisition; it belongs in marketing overhead analysis.
When should you use it?
- - Monthly evaluation of sales and marketing efficiency
- - Comparing controlled vs uncontrolled spend periods
- - Reporting unit economics to investors or board members
- - Determining if channel expansion is paying off
Benefits
- - Reveals which acquisition channels deliver the lowest-cost customers
- - Enables calculation of CAC payback period when paired with ARPA
- - Helps set realistic customer acquisition budgets
Step-by-step example
Sum every dollar spent on acquisition including ad platforms, content production, sales team compensation, CRM tools, and pipeline generation. Count only new customers gained in that same period. Divide spend by customers to find your CAC. Track this monthly to spot trends.
Real-world example
A B2B SaaS company spends $40,000 per month on Google Ads, LinkedIn campaigns, a sales team, and content marketing, acquiring 120 new customers in that period. Their CAC is $333 per customer.