Hustlay
Free SaaS tool

CAC Calculator

Is your customer acquisition cost sustainable?

This CAC calculator divides your sales and marketing spend by new customers to get customer acquisition cost, then adds the LTV:CAC ratio and payback period.

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This period
$
Ad spend + sales/marketing salaries + tools
$
Use the LTV calculator if you don't have this yet
$
%
Your numbers
CAC
$100.00
LTV : CAC
4.5 : 1
Payback
3.2 mo
Healthy (4.5:1).
Solid unit economics. You likely have room to invest more in acquisition and still be profitable.

Key takeaways

  • CAC = sales and marketing spend ÷ new customers acquired: $2,000 ÷ 40 customers = $50.
  • LTV:CAC of 3:1 or better is a common target; below 1:1 every new customer loses money.
  • Payback period = CAC ÷ (monthly revenue per customer × gross margin), in months.
  • Include tools, ads and contractor time in spend, or CAC looks better than it is.

Tag ad spend and tools to the product they grow, and Hustlay shows the profit each product actually returns.

Track spend per product
How it's calculated

CAC = sales & marketing spend ÷ new customers

Worked example
$5,000 spent on ads and sales tools this month, 50 new customers acquired: CAC = $5,000 ÷ 50 = $100 per customer. If each customer is worth $450 over their lifetime, the ratio is 4.5 : 1 — healthy.
CAC only makes sense next to LTV
A $100 CAC is great if the customer is worth $1,000 — and terrible if they're worth $80. CAC alone is a vanity number; always pair it with lifetime value.
FAQ

Common questions about CAC

Customer Acquisition Cost — the fully-loaded cost of acquiring one new customer. CAC = total sales & marketing spend ÷ new customers acquired in that period. Include ad spend, sales salaries, commissions, tools, and content costs tied to acquisition — not just ad spend alone.

Related free tools:
LTV calculator →Churn rate calculator →MRR & ARR calculator →
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