Email List Growth Calculator

See how your email list could grow from the traffic you already have. Put in your monthly visitors and how many of them sign up, and the calculator adds new subscribers each month and takes off the ones who leave. The example numbers are only a starting point, so change them to match your site.

Visitors per month

From your analytics, this month.

Opt-in rate

Of visitors, how many join. Your form tool shows this.

Traffic growth per month

Use 0 if you are not sure.

Unsubscribes per month

Of the list, how many leave each month.

Subscribers today

Months ahead

months

Estimated list size after 12 months

That is about 0 new sign-ups, minus 0 who left.

0new in month 1

0new in the last month

0sign-ups per 1,000 visitors

A more honest range

The same plan with your opt-in rate at half and at one and a half times what you entered.

Scenario	Opt-in rate	List size

Month by month

Month	Visitors	New	Left	List size

How long to reach a goal?

Uses the numbers you entered above.

Subscriber goal

How it works

New subscribers = visitors that month × opt-in rate
Left = list size at the start of the month × unsubscribe rate
Visitors next month = visitors this month × (1 + traffic growth)

A better free gift and a form placed in the right spot often lift the opt-in rate more than new traffic does. Try changing 2% to 3% and watch the result.

Three things this tool can't see

Cleaned lists. Many people remove inactive subscribers now and then, which lowers the count.
Seasons. Traffic and sign-ups go up and down through the year.
Quality. A smaller list of people who read your emails is worth more than a big quiet one.

Free gift: want a simple welcome-email plan for your new subscribers? Get our free starter guide when you join our list. Get it free

STEP 2

The AI Marketing Toolkit for Beginners

A 4-week system for using AI as an honest helper for ideas, outlines, drafts and pins, while you keep the final say.

See the full kit

This is an estimate for planning only, not a forecast or a promise. We make no income claims; results vary and many people earn nothing. Some links on this site may earn us a commission. Read our disclosure.