List Churn
01 Definition
List Churn meaning: The rate at which an email list loses subscribers over time through opt-outs and inactivity.
List churn measures how quickly a list decays as people unsubscribe, mark mail as spam, or go stale and get removed. It combines visible opt-outs with hidden losses like dead addresses. Every list churns, so growth must at least replace the loss.
Also called
Why it matters
How List Churn fits the work
Knowing your churn rate tells you how many new subscribers you need just to stay level, which shapes acquisition goals and budget.
In context
A list of 100,000 lost about 2,500 subscribers a month to opt-outs and cleaning, a monthly churn of roughly 2.5 percent.
Practical note
Track both transparent churn, such as unsubscribes and complaints, and opaque churn, such as bounces and inactivity, since the hidden losses often exceed the visible ones.