Free founder tool
CAC calculator
Work out what each new customer costs you, how many months it takes to earn it back, and your LTV to CAC ratio.
Your numbers
Everything you spent to win customers in the period: ads, tools, content, people.
More inputs (optional)
Average revenue per paying account (ARPA).
Result
Fill in the fields above to see the result.
How this is worked out (formula version 1)
- CAC = sales and marketing spend ÷ new paying customers
- Payback (months) = CAC ÷ (revenue per customer × gross margin)
- LTV to CAC = LTV ÷ CAC, with LTV as in the LTV calculator
Other founder tools
FAQ
About the founder tools
Result looks wrong?
Tell us what you checked and a person on the team will take a look.