Result
Maximum acceptable CAC
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This calculation is for informational purposes only and does not replace advice from a qualified professional. Formulas and rates may not fit your exact situation — double-check the figures before making decisions.
How it is calculated
Maximum acceptable CAC = LTV ÷ target LTV/CAC ratio. This is the reverse of the LTV/CAC calculator: instead of checking the actual ratio from money already spent, a desired ratio is set upfront and a per-customer budget ceiling is derived from it.
An LTV/CAC ratio of 3 is often cited as a minimally comfortable threshold for sustainable growth, but it's an industry convention, not a universal law: a business with a long payback cycle or a high cost of capital may need a higher threshold.
The resulting figure is an upper bound, not a target CAC: the further the actual CAC sits below this ceiling, the bigger the unit-economics safety margin and the faster customer acquisition pays for itself.