iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
CAC, or customer acquisition cost, is the average cost of acquiring one new customer. Calculate it by dividing the acquisition expenses for a defined period by the number of new customers acquired during that same period. The result is useful only when you also define what counts as a customer and which costs are included.
What does CAC measure?
Customer acquisition cost (CAC) measures the average expense of winning a new customer. It can describe a whole business, a customer segment, or a channel, depending on how the costs and customers are grouped. Salesforce defines CAC as the total cost of acquiring one new customer: Salesforce’s CAC guide.
CAC is not automatically the same as advertising spend per sale. A broader calculation may include sales and marketing payroll, commissions, bonuses, software, contractors, and other allocated acquisition expenses. The scope is a methodological choice, not a universally mandated standard, so label what you include.
What is the CAC formula?
CAC = acquisition costs for a defined period ÷ new customers acquired in that same period
#1 Best Overall
For example, Salesforce illustrates $5,000 in monthly sales and marketing spending divided by 100 new customers gained that month, producing a $50 CAC. This is an arithmetic example, not an industry target: Salesforce’s worked example.
How do you calculate CAC consistently?
- Choose a reporting period. Use a month, quarter, or year, and use that same period for both acquisition costs and customers.
- Define a new customer. Specify whether the unit is a first-time buyer, paying account, signed contract, or another clearly defined customer measure. The American Marketing Association’s guidance recommends documenting the customer definition and cost scope: AMA CAC calculator guidance.
- Set the cost scope. Decide whether the calculation includes only direct advertising or also allocated sales and marketing expenses such as payroll, commissions, bonuses, software, and contractor time. Salesforce discusses indirect expenses, while HubSpot’s startup example includes CRM costs and assigns value to founder sales time: Salesforce’s cost guidance and HubSpot’s startup example.
- Sum the included expenses for the period.
- Count qualifying new customers acquired in that period, using the definition you set.
- Divide and label the result. For example: “Q2 blended CAC, including allocated sales and marketing costs.”
Long sales cycles can make a simple same-period ratio misleading: expenses in one month may produce customers later. If you use cohort or lag adjustments to connect costs with later customer wins, describe that method rather than presenting it as the basic formula. For a simple calculation, a spreadsheet is sufficient if the expense records and customer counts are dependable; CRM or analytics reporting can help consolidate the data.
How is CAC different from CPA and CPL?
| Metric | What it divides by | What it tells you |
|---|---|---|
| CAC | New customers acquired | Average acquisition cost per customer under the stated cost scope. |
| CPA (cost per action) | A chosen action or conversion | Cost per selected action, which could be a purchase, registration, or signup. Google Ads describes these as possible actions: Google Ads Help on cost per action. |
| CPL (cost per lead) | Leads generated | Cost of generating leads, which are earlier in the funnel than acquired customers. HubSpot distinguishes cost per lead from CAC: HubSpot’s CAC guide. |
CPA does not always mean CAC. An ad platform’s configured “action” may be a signup or another conversion that is not a new paying customer. Check the denominator before comparing CPA, CPL, and CAC.
How should you interpret a CAC figure?
CAC alone cannot tell you whether growth is profitable or sustainable. Compare it with customer lifetime value (LTV), gross margin, retention, and the time it takes to recover the acquisition cost. A business with a long payback period may face cash-flow pressure even if customers generate value over time. Salesforce discusses using CAC alongside customer lifetime value: Salesforce on CAC and customer value.
There is no universal “good CAC” threshold established by a single standard. Published figures vary by industry and methodology and should not be treated as targets without matching the business model, customer definition, cost scope, and measurement period.
For context, HubSpot’s benchmark page, updated August 4, 2026, reports a combined-average CAC of $239 for B2B SaaS and $791 for real estate, attributing the figures to FirstPageSage material. These are published estimates, not universal benchmarks; HubSpot notes that benchmark calculation is challenging because channel data varies and can be difficult to collect: HubSpot’s CAC benchmark article.
Quick Recap
Best Value
What to align before comparing CAC figures
- Customer unit: Make sure both figures count the same kind of customer or account.
- Cost scope: Distinguish ad-only CAC from calculations that include allocated marketing and sales costs.
- Time period and sales-cycle treatment: Align reporting windows and disclose any lag or cohort method.
- Attribution level: Do not compare blended company CAC with a channel or campaign metric as though they cover the same costs and customers.
- Customer economics: Compare CAC with margin, retention, lifetime value, and payback timing.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
