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Email Marketing Glossary.

Clear, no-fluff definitions of every email marketing term that matters—from open rates to double opt-in. 

 

Email Churn Rate

Email churn rate is the rate at which you lose subscribers — through unsubscribes, bounces, spam complaints, or inactivity. It's the flip side of list growth and a measure of list health.

Also known as: list churn, subscriber attrition, attrition rate

Every list loses people over time. Churn rate quantifies that loss, so you can tell whether your acquisition is keeping ahead of the leaks — and whether those leaks are getting worse.

How is email churn rate calculated?

Churn rate = (subscribers lost ÷ total subscribers) × 100 over a period. It can include transparent churn (unsubscribes, bounces) and opaque churn (subscribers who quietly stop engaging).

Why does churn matter?

High churn erodes the list you worked to build and often signals relevance or frequency problems. Opaque churn is especially risky because disengaged subscribers hurt deliverability before they ever leave.

How do you reduce churn?

Segment for relevance, respect frequency, offer a preference center, and re-engage inactive subscribers before they lapse.

Related terms

Open Rate Click-Through Rate (CTR) Click-to-Open Rate (CTOR) Conversion Rate Bounce Rate Unsubscribe Rate

Related reading from Drip

7 Advanced Ways to Reduce Email Unsubscribe Rates 7 Ways to Lower Your Email Unsubscribe Rate

Frequently asked questions

What is email churn rate?
Email churn rate is the rate at which you lose subscribers over a period — through unsubscribes, bounces, spam complaints, or inactivity. It's the counterpart to list growth rate.
How is email churn rate calculated?
Divide the number of subscribers lost in a period by your total subscribers, then multiply by 100. It can include transparent churn (unsubscribes and bounces) and opaque churn (subscribers who quietly disengage).
What's the difference between transparent and opaque churn?
Transparent churn is visible — unsubscribes, hard bounces, and complaints. Opaque churn is subscribers who stop opening and clicking without formally leaving. Opaque churn is riskier because it drags deliverability down before you notice.
How do I reduce email churn?
Send relevant, segmented content, respect a sensible frequency, offer a preference center so people can dial back instead of leaving, and run re-engagement campaigns before subscribers fully lapse.
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