Financial Glossary
SaaS Churn Rate
SaaS churn rate measures the percentage of customers or recurring revenue a subscription business loses over a given period, calculated by dividing the customers or revenue lost during the period by the count at the start. Customer churn counts logos lost, while revenue churn weights losses by dollar value, and revenue churn can be partially offset by expansion from remaining customers. It is a core health metric because subscription growth depends as much on retaining revenue as on adding it.
Problem & Application
For a SaaS startup or any subscription-based operator, even a modest monthly churn rate compounds into a serious drag on growth and runway, because every lost dollar must be replaced before new revenue counts as net gain. High churn also signals deeper problems with product fit or onboarding that no amount of new sales fully masks. Tracking churn alongside expansion shows whether the business is actually compounding or just running to stand still.
In Short
Churn rate is one of the clearest signals of whether a subscription business is durable, since retained revenue compounds while churned revenue quietly erodes growth.