How to calculate customer acquisition cost (CAC)
Customer acquisition cost (CAC) is the average amount you spend to win one new customer. It is the single most important efficiency metric in a growth business, because every other unit-economics number (payback, LTV to CAC, magic number) is built on top of it.
The formula is simple, but the accuracy lives in what you put in the numerator. A blended, fully loaded CAC that counts people, ad spend, and tools tells the truth. A cherry-picked one that counts only ad spend flatters you and hides the real cost.
- Spend / new customers The core formula
- Fully loaded Include salaries, tools, overhead
- Same period Match spend to customers won
Short answer
Customer acquisition cost is your total sales and marketing spend for a period divided by the number of new customers you won in that same period. If you spent 50,000 dollars and closed 25 customers, CAC is 2,000 dollars. Include salaries, ad spend, tools, and overhead for a fully loaded number.
Step by step
Add up all sales and marketing spend
Sum every acquisition cost in the period: ad spend, salaries and commissions for sales and marketing, software and tools, agency and contractor fees, events, and content. A fully loaded CAC includes people, not just media.
Count the new customers won in that period
Count only genuinely new logos closed in the same window. Do not count renewals, expansions, or free signups. Match the timeframe of the customers to the timeframe of the spend.
Divide spend by new customers
CAC equals total sales and marketing spend divided by new customers acquired. The result is the average cost to win one customer.
Segment it to make it useful
Break CAC out by channel, campaign, and segment. Blended CAC hides which channels are efficient and which are burning cash. Paid CAC for a channel isolates that channel's true cost.
Worked example
Suppose in Q1 you spent 120,000 dollars on marketing (ads, content, tools) and 80,000 dollars on the sales team (salary, commission, software), a total of 200,000 dollars. In the same quarter you closed 50 new customers.
CAC = 200,000 / 50 = 4,000 dollars per customer. If you had counted only the 120,000 dollars of marketing spend, you would report a misleadingly low 2,400 dollars and understate your true cost by 40 percent.
How Ardovo handles it
Ardovo computes CAC live from closed-won deals and connected spend, blended and by channel, so the number is never a quarter-end spreadsheet scramble. Rook explains what moved it: a channel whose CAC crept up, or a campaign quietly dragging the blended average.
Frequently asked questions
What is the CAC formula?
Total sales and marketing spend for a period divided by the number of new customers acquired in that same period. Use a fully loaded numerator that includes salaries, ad spend, tools, and overhead, not just media cost.
What should be included in CAC?
All acquisition costs: paid media, salaries and commissions for sales and marketing, software, agencies, events, and content production. Exclude costs to serve or retain existing customers, which belong to a different metric.
What is the difference between blended and paid CAC?
Blended CAC divides all spend by all new customers, including organic. Paid CAC divides only paid spend by customers acquired through paid channels. Paid CAC is higher and better isolates channel efficiency.
How often should I calculate CAC?
Monthly or quarterly. Watch the trend rather than a single figure. A rising CAC with flat conversion means your channels are saturating and you need new sources of efficient growth.