Email List Growth Calculator
Project your email list size month by month from new sign-ups and the share lost to unsubscribes and bounces, and see where it levels off.
- Free
- No sign-up to try
- Works as you type
Email list growth
List size after those months
19,962
Net growth
7,962
Sign-ups needed per month to stay level
180
Size where losses match sign-ups
60,000
- Each month: list = last month's list × (1 − monthly loss) + new sign-ups.
- Stay level = subscribers now × monthly loss.
- The list levels off where losses equal sign-ups: sign-ups ÷ monthly loss.
Free, no sign-up to try. Save it as a live calculator you can share; an estimate from the numbers you enter, not financial advice. Check the result against your own records before you rely on it.
How it works
How the Email List Growth Calculator works
- 1
Enter your numbers
Every result updates as you type, with the formula shown under it.
- 2
Check the method
See how each number is worked out and what it assumes.
- 3
Save it as a Room
Share a live calculator: others can change the numbers and see the result update.
Worked example
What it makes
Example inputs
- Subscribers now
- 12,000
- New sign-ups per month
- 900
- List lost per month (unsubscribes, bounces)
- 1.5 %
- Months ahead
- 12
Results
- List size after those months
- 19,962
- Net growth
- 7,962
- Sign-ups needed per month to stay level
- 180
- Size where losses match sign-ups
- 60,000
How it's calculated
- Each month: list = last month's list × (1 − monthly loss) + new sign-ups.
- Stay level = subscribers now × monthly loss.
- The list levels off where losses equal sign-ups: sign-ups ÷ monthly loss.
- Assumes: Sign-ups and the loss rate stay the same every month.
- Assumes: New sign-ups are counted at the end of each month.
An estimate from the numbers you enter, not financial advice. Check the result against your own records before you rely on it.
Who it's for
Who uses it
Email marketers
Set a realistic list target for the year.
Creators
See how many sign-ups you need just to stay level.
Ecommerce teams
Plan list growth next to a sales forecast.
Good to know
What to consider
- Sign-ups and the loss rate are held flat for every month.
- Inactive subscribers still count here; clean them out to see your real list.
Questions
About the Email List Growth Calculator
Why does my list stop growing?
Losses are a share of the list, so they grow as the list grows. Growth stops where monthly losses equal monthly sign-ups: sign-ups ÷ monthly loss rate.
Can I share the calculator with my team or a client?
Yes. The Room keeps the calculator live: anyone with the link can change the numbers and see the result update, with the method and assumptions on the same page.
Make your calculator now
Free, no sign-up to try. It becomes a Room you can edit, publish and share.
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