Bootstrapped CPC rule of thumb: ARPU/25
A Smart Bear: Longform
JUNE 7, 2025
If you do have data, the simplistic calculation is [expected months] = 1/c where c is your monthly cancellation rate. So to compute CAC, take your total costs to acquire new customers and divide by the number of customers you acquired. And if youâre running a CPC campaign, that means you can pay up to CAC/100 dollars per click.
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