Bootstrapped CPC rule of thumb: ARPU/25
A Smart Bear: Longform
JUNE 7, 2025
1 The correct version also includes multiplying by Gross Profit Margin, i.e. the cost to serve customers, which for SaaS is tech support, server infrastructure, and payment fees. © 2007-2025 Jason Cohen A simple version 1 is ARPU â [expected months] meaning the average number of months a customer sticks with you. No ShitGPT.
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