Newsletter growth calculator: subscribers, churn and what remains
By Admin Team
Written and maintained by the MaleBay editorial team. Every offer listed is independently reviewed before it appears, and pages are revised as products and terms change.
Published August 17, 2026
Every list leaks. That means a steady signup rate does not produce steady growth — it produces growth that slows and then stops at a predictable size. Knowing that size in advance is far more useful than a growth curve.
Newsletter growth calculator: subscribers, churn and what remains
Everything is calculated in your browser. Nothing is saved or sent anywhere.
Subscribers after 12 months
1,693
- Net growth
- 1,593
- Lost to churn each month (at that size)
- 34
- Ceiling at this signup rate
- 7,500
The ceiling is where churn cancels signups exactly. Growing past it needs more signups, not more time.
A projection with constant signups and churn. Real lists move in bursts.
The ceiling is the point
With constant signups and churn, a list converges on monthly signups divided by churn rate. At 150 signups a month and 2% churn that is 7,500 subscribers — and no amount of additional time gets past it. Doubling the list means doubling signups or halving churn; waiting does nothing.
Common mistakes
- Measuring only gross signups. A list can grow on paper while shrinking in engaged readers.
- Treating unsubscribes as failure. People who no longer want the email should leave; the alternative is worse deliverability.
- Buying or importing lists. It raises the number and destroys both engagement and sender reputation.
Common questions
- What churn rate is normal?
- Roughly 1–3% a month for an engaged list, higher if signups come from sources with weak intent. Measure your own rather than assuming.
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