Definition
Subscriber churn rate (also called list churn rate or attrition rate) measures the percentage of subscribers who leave your email list over a specific period. Churn includes all forms of list departure: unsubscribes, hard bounces, spam complaints, and inactive subscriber removals.
Churn is the natural opposite of list growth. Understanding your churn rate is essential for measuring true list health — a rapidly growing list with high churn is less valuable than a moderately growing list with low churn.
Subscriber Churn Rate Formula
Subscriber Churn Rate = (Subscribers Lost in Period / Total Subscribers at Start of Period) × 100
Example Calculation
If you start the month with 50,000 subscribers and lose 1,500 through unsubscribes, bounces, and removals:
Monthly Churn Rate = (1,500 / 50,000) × 100 = 3%
Types of Churn
| Churn Type | Cause | Typical Rate |
|---|---|---|
| Voluntary churn | Unsubscribes | 40-60% of total churn |
| Involuntary churn | Hard bounces | 20-30% of total churn |
| Complaint churn | Spam complaints | 5-10% of total churn |
| Hygiene churn | Inactive subscriber removal | 10-20% of total churn |
Average Benchmarks
| Industry | Monthly Churn Rate | Annual Churn Rate |
|---|---|---|
| Ecommerce | 3-6% | 30-50% |
| B2B SaaS | 2-4% | 20-40% |
| Media / Publishing | 3-8% | 30-60% |
| Nonprofit | 2-4% | 20-40% |
How to Reduce Subscriber Churn
- Improve welcome experience: A strong welcome sequence sets expectations and reduces early churn by 20-40%.
- Segment by engagement: Send less to disengaged subscribers to prevent fatigue-driven churn.
- Use preference centres: Let subscribers choose frequency and topics rather than unsubscribing entirely.
- Monitor churn by source: Track which acquisition sources produce the highest-churning subscribers and adjust your list building strategy.
- Re-engage before churn: Proactive re-engagement campaigns can recover 10-20% of at-risk subscribers.
Churn vs List Growth
| Scenario | Implication |
|---|---|
| High growth, low churn | Healthy list — sustainable growth |
| High growth, high churn | Quality problem — growing but not retaining |
| Low growth, low churn | Stable but stagnant — need more acquisition |
| Low growth, high churn | Declining list — need urgent intervention |
Related Glossary Terms
A/B Testing
A/B testing in email marketing is the practice of sending two variations of an email to a small sample of your list to determine which version performs better before sending the winner to the remaining subscribers.
Abandoned Cart Email
An abandoned cart email is an automated message sent to customers who added items to their online shopping cart but left without completing the purchase. It is one of the highest-converting email types in ecommerce.
AIDA Model for Email
The AIDA model (Attention, Interest, Desire, Action) is a classic copywriting framework used to structure email campaigns that guide subscribers from awareness to conversion.
AMP for Email
AMP for Email is a Google-developed framework that allows email messages to include interactive elements like forms, carousels, accordions, and live content. It turns static emails into dynamic, interactive experiences directly inside the inbox.
Anchoring Effect in Email Marketing
The anchoring effect is a cognitive bias where the first piece of information presented (the anchor) influences subsequent decisions, used in email to frame pricing and value perception.
Announcement Email
An announcement email is a dedicated campaign that communicates a specific update, milestone, or change to subscribers, from product launches and feature releases to company news and events.
Frequently Asked Questions
Monthly churn of 2-5% is normal for most industries. Above 5% monthly churn indicates issues with list quality, content relevance, or send frequency. Below 2% is excellent.
These terms are often used interchangeably. Subscriber churn rate focuses on individual subscriber departures. List churn rate may include broader list changes such as automated hygiene removals.
Yes. Hygiene removals (removing inactive subscribers) count as churn. This is healthy churn that protects your deliverability, but it should be tracked separately from voluntary unsubscribes.
Annual churn is not simply monthly churn × 12 because churn compounds. A 3% monthly churn rate equals approximately 31% annual churn (calculated as 1 - (0.97^12)).
Content irrelevance is the leading cause of voluntary churn. Subscribers leave when they receive content that does not match their interests or expectations. Improving targeting and personalisation is the most effective churn reduction strategy.