Email churn rate: how to measure it and how to slow it
Every email list loses people. Subscribers unsubscribe, addresses go dead, and some recipients quietly stop opening. Email churn rate measures how fast that happens, and it tells you whether your list is a growing asset or a leaking bucket.
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What email churn rate is
Churn is the share of subscribers you lose over a period. There are two kinds, and they need different responses.
Transparent churn is visible: unsubscribes, hard bounces, and spam complaints. You can count it directly.
Opaque churn is the quiet kind: people who never open and never click but have not formally left. It drags down your reputation without showing up in the unsubscribe number.
How to calculate it
A simple monthly version: churn rate equals unsubscribes plus bounces plus spam complaints, divided by total subscribers at the start of the period.
If you began the month with 20,000 subscribers and lost 400 to unsubscribes, bounces, and complaints, that is a 2 percent monthly churn rate. To capture opaque churn too, track the share of your list that has not engaged in 90 days alongside it.
Why some churn is healthy
A subscriber who will never engage again is a liability, not an asset. They cost you sender reputation every time you mail them and skew every metric you read. Removing or suppressing them deliberately, through a sunset policy, often improves delivery for everyone who remains. The goal is not zero churn. It is keeping avoidable losses low while clearing out the dead weight on purpose.
How to slow the churn you can control
Set expectations at signup. Tell people what they will get and how often. Mismatched expectations drive early unsubscribes.
Offer a preference center. Let people choose fewer emails or specific topics instead of leaving entirely.
Segment and personalize. Relevant emails keep people subscribed, so send based on behavior and interest.
Watch frequency. Unsubscribe spikes after a send usually mean too much, too often, or off-topic.
Run a re-engagement flow, then sunset. Give quiet subscribers one clear win-back sequence, then suppress the ones who still do not engage.
Keep the list clean. Remove hard bounces automatically and prune long-inactive contacts on a schedule.
In Loops, an automatic suppression list, a preference center, segments, and lifecycle workflows give you the pieces to run a re-engagement-then-sunset policy. For the metric side, see email marketing KPIs.
Frequently asked questions
What is a good email churn rate?
How do I reduce subscriber churn?
Is high churn always bad?
Does churn affect deliverability?