What is CAC?

CAC (Customer Acquisition Cost) is the total marketing + sales spend to acquire one new customer. Different from CPA: CAC includes all spend (team salaries, tools, agency fees), CPA is only ad spend. The core sustainability metric for SaaS, subscription and high-LTV models.

// formula

"Total spend" matters. Loaded CAC includes: ad budget, marketing salaries, sales salaries + commission, CRM/tooling subs, agency fees, content production, events, etc. Just dividing ad spend by customers gives you "paid CAC" — real CAC is usually 1.5-3x higher.

// LTV:CAC ratio

CAC alone is meaningless; read with LTV:

• LTV:CAC < 1 — losing money on each customer.
• LTV:CAC ≈ 1-2 — break-even, hard to grow.
• LTV:CAC ≈ 3 — healthy SaaS standard.
• LTV:CAC > 5 — under-investing in growth.

// CAC payback period

CAC payback = CAC / Monthly Gross Margin. How many months until a customer pays back acquisition cost.

• SaaS healthy threshold: <12 months.
• One-time-purchase e-commerce: payback at first order.
• Subscription / membership: 6-9 months preferred.

// lowering CAC

• Organic channels — SEO, content, referral cut CAC 30-60% but require 6-12 months investment.
• Funnel optimization — landing CR 2% → 4% halves CAC.
• Channel mix — shift from expensive to cheap; MMM grounds this in data.
• Self-serve onboarding — for SaaS, removing demo-call requirement zeros out sales-team CAC.