Email churn rate: how to measure it and how to slow it
Email churn rate measures the share of subscribers lost during a period. Count unsubscribes, hard bounces, and spam complaints once per contact, then track inactivity separately.
What email churn rate is
Separate confirmed subscriber loss from inactivity. They call for different responses.
Visible churn includes unsubscribes, hard bounces, and spam complaints. Count the affected contacts, not the number of events.
Inactivity means a subscriber has stopped showing the signals you track, such as clicks, replies, or product use. Missing opens alone do not establish inactivity, and inactivity does not mean the contact has unsubscribed.
How to calculate it
For a monthly cohort measure, divide the unique subscribers from the start-of-month list who unsubscribe, hard bounce, or complain during that month by the subscriber count at its start. Multiply by 100. Count each person once even if they appear in several categories. Exclude temporary bounces and people added after the month began. Record resubscriptions separately so they do not erase a loss event in this measure.
If you began the month with 20,000 subscribers and 400 of those people unsubscribed, hard bounced, or complained, that is a 2 percent monthly churn rate. Track new subscribers and resubscriptions alongside it to explain net list growth. For inactivity, choose a separate window that fits your sending cadence. A 90-day window is an example policy, not a benchmark for every list.
When to pause inactive subscribers
Review contacts who have no recent clicks, replies, or product activity before sending more promotions. A paying customer who rarely opens email may still use your product every day. For subscribers with no such signals, try a limited re-engagement sequence, then pause marketing sends if they remain inactive. Keep account-critical transactional messages separate. Record these deliberate pauses separately from subscriber-initiated losses.
How to slow the churn you can control
Tell people at signup which emails they will receive and how often.
Offer topic preferences so subscribers can stop one type of email without leaving every list.
Use role, plan, and recent product activity to select the audience for each message.
When unsubscribes rise, compare recent frequency, signup source, and campaign topic before choosing a fix.
Set a limit on re-engagement attempts and pause further marketing sends when subscribers remain inactive.
Suppress hard bounces and complaints. Review inactivity on a separate 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?