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Customer Acquisition Cost (CAC)

Short answer

Customer Acquisition Cost (CAC) is the fully-loaded sales + marketing spend per new customer landed. It is only meaningful when paired with LTV — a $500 CAC can be excellent or terrible depending on how long the customer stays and what they're worth.

Worth quotingA widely-cited institutional benchmark for SaaS is CAC payback within 12 months. Beyond 24 months, the growth engine effectively requires external capital to fund — useful directionally, but the specific cutoff varies by capital market conditions.

Formula

CAC = (Sales Spend + Marketing Spend) / New Customers Acquired

Add up everything you spent on sales and marketing in the period. Divide by the number of NEW paying customers you brought on. The result is what each customer cost you to land.

Why it matters

CAC only makes sense when paired with LTV (Lifetime Value). A $200 CAC is cheap if customers stay for 5 years and pay $100/month; it is a problem if they churn in 6 weeks. Investors and acquirers use CAC + payback period to gauge whether growth spend is creating durable value or burning cash.

Benchmarks

Standalone metricNot meaningful alone — compare to LTV
Conventional SaaS guidelineLTV:CAC ≥ 3×
Conventional SaaS guidelinePayback < 12 months
Industry variationVaries hugely by channel + sector

Worked example

  • Sales + marketing spend (quarter)$120,000
  • New paying customers240

CAC = $120,000 ÷ 240 = $500 per customer

People also ask

Common questions about Customer Acquisition Cost (CAC)

What is Customer Acquisition Cost (CAC)?+

Customer Acquisition Cost (CAC) is the fully-loaded cost to acquire one new paying customer — sales + marketing spend divided by new customers won in the same period.

How is Customer Acquisition Cost (CAC) calculated?+

Add up everything you spent on sales and marketing in the period. Divide by the number of NEW paying customers you brought on. The result is what each customer cost you to land.

What is a good Customer Acquisition Cost (CAC)?+

A healthy customer acquisition cost (cac) is typically around LTV:CAC ≥ 3× — conventional saas guideline. Specific targets vary by industry and stage; check our benchmarks above for your sector.

Why does Customer Acquisition Cost (CAC) matter?+

CAC only makes sense when paired with LTV (Lifetime Value). A $200 CAC is cheap if customers stay for 5 years and pay $100/month; it is a problem if they churn in 6 weeks.

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Related concepts

Where this matters most

See Customer Acquisition Cost (CAC) in the context of saas & software.

Industry-specific benchmarks, common pitfalls, and what lenders look for in this sector.

SaaS & software hub

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