Retention Strategy

What Is a Good Email List Growth Rate (and How Do You Calculate It)?

A good email list growth rate is one that comes from three things working together: steady traffic, a signup form that converts well, and low churn. For most brands, we want to see signup forms converting 6 to 12% of visitors. That's your best starting point. Then measure growth as net growth: new subscribers minus unsubscribes and suppressed or deleted profiles, divided by the list size you started with. And a list that grows fast but never buys isn't a win either.

"How big is our list?" is the wrong question.

"Is the audience we can actually reach getting bigger and better?" is the right one.

A list can grow while deliverability and revenue get worse. A list can also shrink after a cleanup and perform better than ever. That's why net growth matters so much more than total headcount.

By Emiel Dingemans, Founder of Magicianly

What Is a Good Email List Growth Rate?

It depends on three things: how much traffic you get, how many of those visitors sign up, and how many subscribers you lose. Get the signup rate right first. For most brands, we want to see signup forms converting 6 to 12% of visitors. So for every 100 visitors, 6 to 12 new subscribers join your list.

If your form converts at 2%, that's where your growth is leaking, and no formula will fix it.

A few other things will move your number around in a given month:

Traffic and channel mix. A paid social push can bring in lots of low-intent signups. Organic visitors and checkout opt-ins usually behave differently.
Your offer. A big discount can grow the list fast and hurt your margin at the same time.
Seasonality. Black Friday and Q4 aren't a normal January.
List cleaning. A month where you suppress inactive profiles can show low or even negative growth and still be the right call.
What happens after signup. Subscribers who go through a strong welcome flow and buy are worth far more than subscribers who just sit there.

So judge your growth rate next to:

how many subscribers become customers;
how well your welcome flow converts;
revenue per subscriber over a set window;
whether your engaged segment is growing too.

What Is Email List Growth Rate?

It's how fast your reachable subscriber list changes over a period, shown as a percentage of the list you started with.

Most teams use it loosely to mean "how many new emails did we collect." That's only half the story.

Say you add 1,000 subscribers in a month, but 800 inactive profiles get suppressed in the same month. Your list didn't grow by 1,000. The net change is what counts.

How Do You Calculate Email List Growth Rate?

Take new subscribers, subtract unsubscribes and suppressed or deleted profiles, divide by your starting list size and multiply by 100.

Email list growth rate (%) = ((new subscribers - unsubscribes - suppressions and deletes) / starting list size) x 100

Use the same period every time. We like monthly, so you can compare month to month.

What goes into each part of the formula?

New subscribers: people who opted in during the month (forms, checkout, and any other consented sources you count).

Unsubscribes: people who opted out during the month.

Suppressions and deletes: profiles you removed from your marketing list through cleaning, like bounces, long-term inactive profiles and manual deletes.

Starting list size: your reachable marketing list on day one of the month. Decide once whether that means all subscribed profiles or only engaged ones, and stick with it.

If your email platform reports these numbers differently, map them once and reuse the same setup every month.

A worked example

Illustrative numbers, just to show the math:

starting list: 20,000
new subscribers: 2,400
unsubscribes: 200
suppressions and deletes: 600
net change: 2,400 - 200 - 600 = 1,600
growth rate: (1,600 / 20,000) x 100 = 8% for the month

That 8% isn't a target. It just shows the math. What matters is whether your number moves in the right direction month to month, and why.

Then write one line next to the number: "cleanup month," "BFCM push," "new popup test," "paid spike" or "welcome rebuild." That little note turns a percentage into something you can act on.

Why Does Net Growth Matter More Than New Signups?

New signups tell you whether your forms work. Net growth tells you whether your reachable audience actually got bigger after people left and you cleaned up.

Cleaning will make net growth look worse some months. That's fine. A big inactive list can drag the whole program down, which is why we wrote a full guide on email list cleaning.

Unsubscribes are part of the honest picture too. A spike is worth looking into (see email unsubscribe rate), but an unsubscribe is still a lot healthier than a spam complaint.

Should You Track Engaged-List Growth Too?

Yes. Your engaged audience (people who click, browse your site and buy, not just open) is the part of the list that actually makes money.

Why it matters:

opens are an unreliable signal now that privacy features inflate them;
a bigger list of people who never click isn't a bigger asset;
your campaigns should mostly go to engaged segments anyway.

If total subscribers grow but your engaged segment stays flat, the problem usually sits in signup quality, your welcome flow or how relevant your emails are. Another popup variant won't fix that.

How Should You Read a Rising or Falling Growth Rate?

Look at what's driving the number before you celebrate or panic.

High growth, weak welcome conversion: you're collecting email addresses, not customers.

Flat growth, growing engaged segment: often healthier than it looks.

Negative growth after a planned cleanup: usually a win for deliverability and costs.

High growth driven by discount hunters: watch first-order margin and second purchases, and check whether your cross-sell flow and post-purchase emails can turn those buyers into repeat customers.

Steady list, but fewer high-value buyers: list size is hiding a retention problem. Our VIP customer flow guide covers how to look after that group.

How Do You Improve a Low Email List Growth Rate?

Start with your signup forms, because that's where most of the growth comes from. Then fix what happens after people subscribe.

Get your signup form converting 6 to 12% of visitors with a better experience and offer. Our guides to the Shopify email popup, the Klaviyo pop-up form and Alia popups for Shopify walk through it.
Add opt-ins at checkout and across the site, not just one popup.
Make your welcome flow turn new subscribers into customers.
Check which acquisition channels bring buyers, not just email addresses.
Clean your list on a schedule, without deleting good customers because they had one quiet month.

What not to do: blast colder segments harder to make up for slow growth. That usually leaves you with a less healthy list, not a bigger one.

Where Does List Growth Fit in Your Retention Numbers?

List growth is an input. It doesn't prove your email program is working.

Pair it with the numbers that do: first-to-second purchase rate, repeat purchases, customer lifetime value and margin after marketing costs. We break those down in ecommerce retention metrics.

A bigger list feeding a weak retention system is just a more expensive way to stay busy.

What Are the Most Common List Growth Mistakes?

Most of them come from counting signups and ignoring everything else.

Celebrating new subscribers and ignoring suppressions.
Measuring weekly one month and monthly the next.
Changing what "starting list size" means every report.
Treating a cleanup month as a failure.
Pushing signup rate up while fewer subscribers become customers.
Using total list size as a stand-in for engaged audience health.

So What Is a Good Email List Growth Rate?

One that grows for the right reasons: steady traffic, a signup form converting 6 to 12% of visitors, and churn you keep under control.

Calculate it after unsubscribes and suppressions, use the same inputs every month, and read it next to your engaged segment, welcome conversion and who you're actually bringing in.

A healthy list grows for the right reasons. And sometimes it gets smaller because cleaning says it should.

If you want help building the capture side, start with how to build your Shopify email list.

Frequently Asked Questions

What is a good email list growth rate?

It depends on your traffic, your signup rate and how many subscribers you lose. Start with the signup rate: for most brands, we want to see signup forms converting 6 to 12% of visitors. Then track net growth after unsubscribes and suppressions month to month.

How do you calculate email list growth rate?

Take new subscribers, subtract unsubscribes and suppressed or deleted profiles, divide by your starting list size and multiply by 100. Use the same period every time, ideally monthly.

Should suppressions count against list growth?

Yes. If you want to know how your reachable audience changed, suppressions have to come off. Leaving them out makes growth look better than it is.

Is negative list growth always bad?

No. A planned cleanup month can shrink your list and still make your email program healthier.

What's the difference between signup rate and list growth rate?

Signup rate tells you how many visitors join through your forms. List growth rate tells you how your whole list changed after new signups, unsubscribes and cleaning.

Should I track engaged-list growth too?

Yes. Growth in people who click, browse and buy says more about the health of your list than total size does.

How do I grow my email list faster?

Get your signup form converting 6 to 12% of visitors with a better form and a stronger offer, add opt-ins at checkout, and make sure your welcome flow turns new subscribers into customers.