Definition
Customer Acquisition Cost (CAC) is the total sales and marketing cost required to acquire one new paying customer over a period.
Answer-first summary
Customer Acquisition Cost (CAC): Customer Acquisition Cost (CAC) is the total sales and marketing cost required to acquire one new paying customer over a period.
Formula
CAC
CAC = (Sales & Marketing Spend) / (New Customers Acquired)
- Sales & Marketing Spend: Fully-loaded spend for the period (ads, tools, salaries)
- New Customers: New paying customers acquired in the same period
Spend $120k in a month and acquire 20 customers → CAC = $6,000.
How to improve
- Increase conversion rates (visit→signup→paid).
- Improve targeting and messaging.
- Shorten sales cycle and improve win rate.
Common pitfalls
- Excluding salaries/overhead and calling it CAC.
- Mismatching spend and customers timing (lagged conversion).
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FAQ
- Should CAC be calculated with a lag?
- Often yes—spend happens before customers convert. Many teams use a trailing period to align spend with results.
- CAC vs CPA?
- CPA is cost per acquisition event (lead/signup); CAC is cost per paying customer.
Topic hub
Explore the full cluster for stronger context, benchmarks, templates, and comparisons.
Related metrics
- CAC Payback Period
Learn CAC payback period (definition + formula), see benchmark ranges, common pitfalls, and practical levers to shorten payback.
- LTV:CAC Ratio
Learn LTV:CAC, how to calculate it correctly, benchmark ranges, and levers to improve it.
- SaaS Magic Number
Magic number estimates how much new ARR you generate per dollar of sales & marketing spend.
- Customer Lifetime Value (LTV)
Learn LTV, how to calculate it safely, common pitfalls, and how to increase it.
- Gross Margin
Gross margin is revenue minus COGS. Learn SaaS-specific COGS, benchmarks, and improvement levers.
- Burn Multiple
Burn multiple measures how much cash you burn to generate net new ARR. Learn formula and levers.
Related calculators
- CAC Payback Calculator
Calculate CAC payback period using CAC, ARPA, and gross margin. Share results via URL and track improvements over time.
- LTV:CAC Ratio Calculator
Compute LTV:CAC ratio using LTV and CAC or via ARPA/gross margin/churn + CAC.
- LTV Calculator
Calculate LTV using ARPA, gross margin, and churn. Includes shareable inputs via URL.
- Burn Multiple Calculator
Calculate burn multiple from net burn and net new ARR.
Related templates
- GTM Scorecard Template
Template for CAC, payback, win rate, cycle length, and pipeline coverage.