Subscriber Retention Calculator
Calculate subscriber retention, churn rate, unsubscribe pressure, net growth, and replacement subscribers needed.
Calculate subscriber retention, churn, unsubscribe pressure, and the new subscribers needed to replace list losses.
Advanced inputsinactive losses and time period
What this means
Retention is 98.00% and churn is 2.00%. Net subscriber change is 410.
Retention rate
Excellent98.00%
Subscribers kept from the starting list.
Churn rate
2.00%
Lost subscribers divided by starting subscribers.
Monthly churn rate
2.00%
Churn normalized by the number of months in the period.
Lost subscribers
240
Total unsubscribes and other subscriber losses.
Net growth
Growing410
New subscribers minus lost subscribers.
Ending subscribers
12,410
Subscribers at the end of the period.
Replacement needed
240
New subscribers needed just to offset churn.
What this tool does
The Subscriber Retention Calculator shows whether a newsletter list is staying healthy after acquisition. It uses starting subscribers, new subscribers, unsubscribes, and other losses to calculate retention rate, churn rate, net growth, ending subscribers, and replacement growth needed.
How to use it
- Enter starting subscribers for the period.
- Add new subscribers, unsubscribes, and other losses.
- Review retention rate, churn rate, and net growth.
- Compare churn with the subscriber growth required for your goal.
Subscriber retention formula
- Lost subscribers = unsubscribes + other losses.
- Retained subscribers = starting subscribers - lost subscribers.
- Retention rate = retained subscribers / starting subscribers.
- Churn rate = lost subscribers / starting subscribers.
- Net growth = new subscribers - lost subscribers.
Subscriber retention example
If a newsletter starts with 5,000 subscribers, adds 350, and loses 90, ending subscribers are 5,260 and net growth is 260.
Retention rate is 98.2% because 4,910 of the original 5,000 subscribers were retained.
When to use this tool
- Understand whether list growth is healthy.
- Separate acquisition from churn.
- Estimate replacement subscribers needed each month.
- Spot content, deliverability, or audience-fit issues.
Related tools and guides
Understand whether the list is healthy
This calculator helps newsletter and email operators separate acquisition from retention. Add starting subscribers, new subscribers, unsubscribes, and other losses to see churn, retention, and net growth.
Use it when monthly subscriber growth looks good but the list still feels harder to grow than expected.
Subscriber retention formulas
- Lost subscribers = unsubscribes + other losses
- Retention rate = retained subscribers / starting subscribers
- Churn rate = lost subscribers / starting subscribers
- Net growth = new subscribers - lost subscribers
- Ending subscribers = starting + new - lost subscribers
Related calculator tools
FAQ
Common questions about retention, churn, and unsubscribes.
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