Email List Growth Calculator
Measure net subscriber growth across an email-list reporting period and estimate the unsubscribe rate using the volume of emails sent or delivered supplied by the user.
How to use this calculator
- Enter the starting subscriber count, new subscribers, unsubscribes and sent/delivered email volume for the same period.
- Check the labels and units before applying the result to a real task.
- Change one input at a time when comparing scenarios.
Formula and method
Ending list = starting list + new subscribers − unsubscribes; growth% = net adds ÷ starting list × 100
- Ending list = starting list + new subscribers − unsubscribes; growth% = net adds ÷ starting list × 100
- Use consistent definitions and periods for active subscribers, new signups, unsubscribes and email volume. The tool does not measure engagement or list quality.
Worked examples
Worked example
A starting list of 10,000 gains 400 subscribers and loses 100.
The ending list is 10,300 and net growth is 300/10,000 = 3%.
The ending list is 10,300 and net growth is 300/10,000 = 3%.
Understanding the result
Measure net subscriber growth across an email-list reporting period and estimate the unsubscribe rate using the volume of emails sent or delivered supplied by the user.
Use consistent definitions and periods for active subscribers, new signups, unsubscribes and email volume. The tool does not measure engagement or list quality.
Important notes
Use consistent definitions and periods for active subscribers, new signups, unsubscribes and email volume. The tool does not measure engagement or list quality.
Displayed values are rounded for readability; retain appropriate precision when continuing a calculation.
Frequently asked questions
What is net list growth?
Net list growth is new subscribers minus unsubscribes, compared with the size of the starting active list.
What denominator is used for unsubscribe rate?
This tool divides unsubscribe count by the email volume entered. Some platforms use delivered emails or campaign-specific definitions, so match your reporting source.
Does this measure subscriber engagement?
No. Growth and unsubscribe rate do not describe opens, clicks, audience intent or long-term subscriber value.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
- CAGR Explained: Compound Annual Growth Rate — Learn the CAGR formula and how to use it to compare growth over multiple years.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.