If you’ve logged into Shopify Analytics recently and noticed your conversion rate looks a little different, there might be a very good reason for it.

And before you start changing your website, rewriting product descriptions or questioning everything you thought you knew about your store...

It might not actually be your website.

Shopify has just changed the way it measures sessions in Shopify Analytics.

The update rolled out between 21–23 September 2026 and, according to Shopify, it can affect your reported sessions, conversion rate and a number of other session-based metrics.

So, let’s talk about what’s changed, why it matters, and something I think every eCommerce brand owner should understand:

Your conversion rate is an incredibly useful metric. But it never tells the whole story.

First: how is your Shopify conversion rate calculated?

At its simplest:

Conversion rate = orders ÷ sessions × 100

So if your store receives 1,000 sessions and generates 20 orders:

20 ÷ 1,000 × 100 = 2% conversion rate

Simple enough.

But there are two numbers in that calculation.

We tend to focus heavily on the orders, but what Shopify counts as a session matters too.

And that’s where this latest update comes in.

What has Shopify changed?

Shopify has made several changes to the way sessions are measured in Analytics.

Firstly, identified bot sessions are now filtered out of session-related reports by default.

That means automated traffic that Shopify identifies as coming from bots may no longer be included in your session count.

Shopify has also changed how it handles customer activity across midnight UTC. Previously, that activity could be split into separate sessions. Now, a session continues based on customer activity and ends after 30 minutes of inactivity.

And finally, Shopify is now counting some customer journeys that don’t include a traditional pageview. One example is a customer going directly to checkout through a cart link.

The result?

Your session count could go up or down.

And because sessions are part of the conversion rate calculation, your conversion rate can move with it.

Shopify has confirmed that the update can affect metrics including sessions, conversion rate, add-to-cart rate, reached checkout rate, checkout conversion rate, bounce rate, pageviews per session and online store visitors.

Importantly, your orders, sales and customer counts aren’t being changed by this update.

So if your conversion rate suddenly looks different, it doesn’t necessarily mean your customers have started behaving differently.

The way Shopify is measuring those sessions may simply have changed.

Here’s why I think this matters beyond the Shopify update

This is actually a perfect example of something I talk about with clients all the time.

Conversion rate is maths.

And that means you need to understand what’s happening on both sides of the equation before deciding you have a conversion problem.

Imagine your store usually gets:

1,000 sessions + 30 orders = 3% conversion rate

Then you run a big Meta campaign and bring another 1,000 people to your website.

But that new audience is colder and only generates another 10 orders.

You now have:

2,000 sessions + 40 orders = 2% conversion rate

Your conversion rate has dropped from 3% to 2%.

But your orders have increased from 30 to 40.

Does that automatically mean your website got worse?

No.

It means something changed in the numbers feeding into your conversion rate.

And this is why I never like looking at conversion rate in isolation.

Sometimes it IS a website problem

There are absolutely situations where a low or declining conversion rate points towards friction on your Shopify store.

Perhaps your product pages aren’t giving customers enough information to make a confident decision.

Your navigation might make products difficult to find.

Your mobile experience could be clunky.

Your shipping information might appear too late in the customer journey.

Your calls to action could be getting lost.

There might be technical issues.

Or perhaps the overall experience simply isn’t building enough trust.

These are all things I look at when reviewing a Shopify store from a conversion perspective.

But...

Sometimes it’s a traffic problem

You can have a beautifully designed, conversion-focused Shopify store and still have a conversion rate problem if you’re sending the wrong people to it.

More traffic doesn't automatically mean more qualified traffic.

If you dramatically increase traffic through paid advertising, influencer activity, a viral social post or a broad awareness campaign, you might attract more people who are simply browsing.

Your sessions increase.

Orders might increase too.

But your conversion rate can fall.

That context matters.

Sometimes there’s a disconnect between the ad and the website

This is another one I see brands overlook.

Imagine an ad is promoting a very specific product, benefit or offer.

Someone clicks because that is what they want.

Then they land on a generic homepage and have to go looking for it.

You've just added friction.

Or perhaps the messaging in the ad sets one expectation, while the product page tells a slightly different story.

Again, the website itself might not be “bad”.

The problem is the journey between the ad and the landing page.

When I’m looking at conversion performance, I want to know:

Who is coming to the website? Where are they coming from? What were they expecting to find? Where did they land? And what happened next?

That gives us a much more useful picture than one conversion-rate percentage ever could.

So, what should you do about Shopify’s latest change?

For most Shopify merchants, you don’t need to do anything.

But you do need to be careful with your reporting.

Shopify recommends treating data after the September update as a new baseline for session-based metrics.

If you’re comparing September/October performance with an earlier period, remember that the underlying session measurement has changed.

You can also look at reports that support Shopify’s Human or bot filter to better understand what’s being included in your session data.

And most importantly, look at your conversion rate alongside your orders, sales and customer numbers.

If your conversion rate has changed but those numbers haven’t, Shopify’s measurement update may be part of the explanation.

Your conversion rate is a clue, not a diagnosis

I LOVE conversion data.

Give me Shopify Analytics, a heatmap and a customer journey to investigate and I am very happy.

But a conversion rate can tell you that something is happening.

It can't always tell you why.

That’s where you need to dig deeper.

Look at your traffic sources.

Look at your landing pages.

Look at behaviour across devices.

Look at add-to-cart and checkout behaviour.

Look at the customer journey.

And yes, look at the website itself.

Because improving your conversion rate isn't about blindly changing button colours or copying whatever another brand is doing.

It’s about finding the friction, understanding what the data is telling you and making strategic changes based on what you find.

And sometimes?

The answer is simply that Shopify changed the maths behind one of the numbers.

Not sure what’s actually holding your Shopify store back?

My Shopify Success Blueprint is a deep-dive strategy audit designed to take the guesswork out of improving your store.

I review your website through a strategic, customer and conversion lens to identify what’s working, where customers may be getting stuck and where your biggest opportunities are.

You walk away with clarity and a practical roadmap of what to tackle next.