Understanding your CAC results
CAC is typically evaluated in context, most often against customer lifetime value (LTV), since a CAC figure on its own does not indicate whether acquisition spend is generating an adequate return.
| Metric | What it tells you |
|---|---|
| CAC | The average marketing and sales cost to acquire one new customer over the period. |
| Total acquisition spend | Combined marketing and sales spend attributable to new customer acquisition for the period. |
- This calculator computes a blended CAC across all acquisition channels; CAC often varies significantly by individual channel (e.g., paid search vs. organic vs. referral), which a blended figure does not reveal.
- CAC is most informative when paired with customer lifetime value (LTV) — use the CLV calculator to compare CAC against expected lifetime revenue and see the resulting LTV:CAC ratio.
What is customer acquisition cost (CAC)?
Customer acquisition cost is the average amount a business spends on marketing and sales to acquire one new customer, calculated by dividing total acquisition spend by the number of new customers gained over the same period. It is one of the most closely tracked efficiency metrics in SaaS and subscription businesses, commonly analyzed together with customer lifetime value (LTV) to assess whether acquisition spend is generating a healthy return.
Total acquisition spend typically combines all marketing costs (advertising, content, campaigns) and sales costs (sales salaries, commissions, tools) attributable to acquiring new customers over the measurement period. David Skok's widely cited SaaS Metrics 2.0 framework, published via forEntrepreneurs.com, describes CAC as a foundational input to evaluating a company's growth efficiency alongside LTV.
CAC is most meaningful when tracked over consistent time periods and compared against customer lifetime value — a low CAC relative to LTV suggests efficient, sustainable growth, while a CAC approaching or exceeding LTV signals a growth model that may not be sustainable without improving one or both metrics.
How to use this CAC calculator
- Enter total marketing spend for the period being measured.
- Enter total sales spend for the same period (salaries, commissions, sales tools attributable to new customer acquisition).
- Enter the number of new customers acquired during that period.
- Read the resulting CAC (spend per new customer) and total acquisition spend.
The formula behind CAC
CAC is calculated by adding marketing spend and sales spend for the period, then dividing by the number of new customers acquired in that same period. For example, with $50,000 in marketing spend, $30,000 in sales spend, and 400 new customers, CAC is ($50,000 + $30,000) ÷ 400 = $200 per customer.
Common mistakes
- Omitting sales costs (salaries, commissions, tools) and counting only paid advertising spend, which understates true CAC.
- Mismatching the time period between spend and new customers — for example, using this month's spend against a prior month's signups when there is a sales-cycle lag between spend and conversion.
- Looking at CAC in isolation without comparing it to customer lifetime value, which is necessary to judge whether acquisition spend is actually paying off.
- Blending CAC across very different acquisition channels or customer segments, which can hide that some channels are far more efficient than others.
الأسئلة الشائعة
How do you calculate customer acquisition cost?
Customer acquisition cost (CAC) is calculated by adding total marketing spend and total sales spend for a period, then dividing by the number of new customers acquired during that same period. It represents the average cost of acquiring one new customer.
What is a good CAC?
There is no universal 'good' CAC figure in isolation — it depends heavily on the customer's lifetime value (LTV) and the business's margins. CAC is typically evaluated relative to LTV, with an LTV:CAC ratio of 3:1 commonly cited in SaaS metrics frameworks (such as David Skok's SaaS Metrics 2.0) as a healthy benchmark.
Should CAC include sales costs or only marketing spend?
Standard CAC calculations include both marketing and sales costs attributable to acquiring new customers, since both functions typically contribute to converting a prospect into a customer. Using marketing spend alone understates the true cost of acquisition for most businesses with a sales team.
How does CAC relate to customer lifetime value (LTV)?
CAC and LTV are usually analyzed together as a ratio (LTV:CAC) to assess whether the revenue expected from a customer over their lifetime justifies the cost of acquiring them. A widely cited SaaS benchmark treats a 3:1 LTV:CAC ratio as a healthy target, though the right ratio varies by business model and growth stage.
المراجع
- Skok D. SaaS Metrics 2.0 — A Guide to Measuring and Improving What Matters. forEntrepreneurs.com.
- Bessemer Venture Partners. State of the Cloud / Cloud Index — SaaS benchmark metrics. bvp.com.
- Kotler P, Keller KL. Marketing Management. 15th ed. Pearson, 2016.