This article was originally published at https://saastools.corenk.com/articles/saas-churn-rate-formula
You closed the month at $12,750 MRR. But when you opened your dashboard on the 3rd, $890 had quietly walked out the door — six cancellations, one downgrade, and two payment failures that won’t retry. That $890 won’t come back. And next month, the same silent arithmetic starts all over again. If the only number you’re tracking is a rough churn percentage from your billing tool, you are flying into a cash wall with the instrument panel switched off.
Most bootstrapped founders treat the SaaS churn rate formula as a single division problem they glance at quarterly. The truth: there are three distinct formulas, and each one tells you a different survival story. This guide will walk you through the exact calculations, give you worked examples you can steal, and show you how to read the numbers before your runway becomes a countdown. If you want the full context of why churn kills, the full churn rate overview explains the silent compounding that turns small losses into fatal ones.
How Do You Calculate Customer Churn (Logo Churn)?
Logo churn is the bluntest instrument in your financial toolkit, yet it’s the one most founders default to. The calculation is dead simple, but what it hides is far more dangerous than what it shows.
