Ecommerce Metrics That Show If Your Store Makes Money

Your Shopify admin shows you dozens of numbers every day.

Only a handful of them tell you if your store is actually making money.

I'm Brian Cleary, founder of Interlace Digital, a Shopify growth agency in Buffalo. My team spends its days inside the ad accounts and store data of growing brands.

The pattern we keep finding? Brands celebrating the numbers that look good while their sales quietly stall.

This guide is for founders and marketing leads at Shopify and direct-to-consumer (DTC) brands. It covers the 15 ecommerce metrics worth tracking, what each one tells you, and which ones to focus on first.

TL;DR: The Ecommerce Metrics That Matter Most

Here's the short version of what to track and why:

• The 15 metrics in this guide fall into 4 groups: profit, acquisition, store performance, and retention.
• Start with profit metrics, because they show whether your growth is actually paying off.
• Track what each new customer costs you and how much of your revenue comes from first-time buyers.
• Your conversion rate and order value show whether your store turns paid traffic into sales.
• Repeat purchases and lifetime value decide how much you can afford to spend to win each customer.
• Judge success by profit, since reach, clicks, and followers can look great while sales fall.

What Are Ecommerce Metrics?

Ecommerce metrics are the numbers that measure how your online store performs, from how many people visit to how much profit each order leaves you.

They cover the whole customer journey: how shoppers find you, whether they buy, how much they spend, and whether they come back.

For a Shopify brand, this data lives in a few places. Your Shopify admin holds sales, order, and customer data. Meta Ads Manager and Google Ads hold your ad data.

What's the Difference Between a Metric and a KPI?

A metric is any number you can measure. A key performance indicator (KPI) is a metric you've tied to a specific goal and target.

Your conversion rate is a metric. "Lift our conversion rate from 2% to 3% by the end of Q2" is a KPI.

Why does the difference matter? Nobody can chase 15 targets at once.

I'd pick 3 to 5 KPIs that line up with your current goal and watch the rest as context.

Profit Metrics That Tell You If You're Making Money

Profit metrics come first because they answer the biggest question in eComm: is the business making money?

These 3 metrics tell you where you stand:

1. Marketing Efficiency Ratio (MER)

Marketing efficiency ratio (MER) is your total store revenue divided by your total ad spend across every channel.

If you made $100,000 last month and spent $25,000 on Meta and Google ads, your MER is 4.

I trust MER more than any single ad platform's report.

Why? Meta and Google each take credit for the sales they touched, so their numbers can overlap. MER uses your real Shopify revenue, so nothing gets counted twice.

It's the first number my team checks for every brand we work with. Oxford Pennant's online sales growth went from -7% to +108% in the first 8 months we worked together, at a reported 5.5 average MER.

2. Contribution Margin

Contribution margin is what's left from your revenue after you pay for the product, shipping, payment fees, and ads.

It's the closest thing to real profit you can check every week.

Say an order brings in $80. If the product costs $25, shipping and fees cost $12, and ads cost $20, that order leaves you $23.

Here's the catch: revenue can climb while contribution margin shrinks.

When that happens, you're buying growth at a loss. And every extra sale makes the hole deeper.

3. Gross Margin

Gross margin is the percentage of each sale you keep after paying for the product itself.

The formula is revenue minus cost of goods, divided by revenue. A $60 product that costs $18 to make has a 70% gross margin.

I look at this number early, because it sets the ceiling on what you can spend to win a sale. A 70% margin gives your ads far more room to work than a 30% margin does.

Acquisition Metrics That Show What Growth Costs

Acquisition metrics show what it costs to bring new buyers into your store. That's where real growth comes from.

Here are the 5 to track:

4. Customer Acquisition Cost (CAC)

Customer acquisition cost (CAC) is your total marketing spend divided by the number of new customers you won in the same period.

If you spend $10,000 and win 200 new customers, your CAC is $50.

Now compare that number to what a first order earns you after product costs. Your breakeven CAC is the point where a customer's first purchase pays for the cost of winning them.

The fastest way to bring CAC down? In our accounts, it's usually better creative.

For one Shopify brand with a $250 average order, our team tested 45 ads and cut the average cost per purchase from over $120 to $67.

5. Return on Ad Spend (ROAS)

Return on ad spend (ROAS) is the revenue an ad platform says it drove, divided by what you spent on that platform.

A $1,000 Meta campaign that reports $4,000 in sales has a 4x ROAS.

ROAS is useful inside an ad account, where it shows which campaigns, ads, and audiences pull their weight. It also helps you compare platforms side by side. Sticky Brand's ad accounts reported a 3.5 average ROAS on Facebook and 6.3 on Google.

To find your breakeven ROAS, divide 1 by your gross margin. At a 70% margin, a ROAS above about 1.43 means the gross profit from those sales covers the ad spend (before shipping and fees).

But a high ROAS can also hide a problem.

We once audited a brand that looked great on paper.

6x to 7x ROAS.

Total sales down year over year.

How does that happen? The ads were mostly selling to existing customers, so the brand had stopped growing.

6. New Customer Share of Revenue

New customer share is the percentage of your revenue that comes from first-time buyers.

We pull it from Shopify's new vs returning customers report, which shows the split right in your admin.

If the number keeps falling, your ads are probably recycling the same buyers...which is exactly what was happening with that high-ROAS brand.

7. Paid Share of Total Sales

Paid share is the percentage of your total Shopify sales that your ad platforms take credit for.

It shows how much your growth depends on ads. For one brand we worked with, paid search drove 85% of total revenue in the first 3 months.

Is a number that high a problem? I'm fine with it while you build other channels. Just know that a rough month on one platform will hit the whole business.

I also split branded search from non-branded search here. Branded search catches people who are already looking for you, so it shouldn't get credit for winning new customers.

8. Click-Through Rate (CTR)

Click-through rate (CTR) is the percentage of people who see your ad and click it.

It's an early signal of whether your creative grabs attention. On Meta, I want a link CTR above 2% before I call an ad a winner.

That's only the first test...the ad still has to bring in customers at a profitable cost.

A strong CTR with weak sales usually points to a problem on your product page.

If you can't tell which of these numbers is off in your own account, our free Facebook ads audit checks your tracking, wasted spend, and creative fatigue. You get a findings report and a 90-day plan to keep, whether you hire us or not.

Store Metrics That Show How Well Your Site Sells

Store metrics show whether your Shopify site turns the traffic you paid for into orders.

These 4 tell you how well it sells:

9. Conversion Rate

Conversion rate is the percentage of store sessions that end in an order.

If 10,000 sessions bring in 250 orders, your conversion rate is 2.5%.

Small gains here add up fast.

We redesigned the product page for a new supplement brand. Within 7 days, its conversion rate climbed from 1% to 3%.

And its CAC dropped by 50% over the same stretch.

10. Average Order Value (AOV)

Average order value (AOV) is your total revenue divided by your number of orders.

A higher AOV lets you pay more to win each customer. Bundles, free gifts at a set order value, and tiered discounts are common ways to raise it.

We always read it next to conversion rate. A big sitewide discount might lift your conversion rate while it drags your AOV down.

11. Add-to-Cart Rate

Add-to-cart rate is the percentage of sessions where a shopper adds at least one product to their cart.

A low rate usually means the product page isn't convincing people.

The usual suspects? Weak photos, unclear benefits, missing reviews, or a price with no context.

12. Cart Abandonment Rate

Cart abandonment rate is the percentage of shoppers who add something to their cart but leave without buying.

It's high for almost every store we look at. Baymard Institute puts the average documented rate at 70.22% (as of the time of writing).

Baymard's same research found that 40% of shoppers who abandoned a cart did it because extra costs like shipping, tax, and fees were too high. Forced account creation and long checkouts also made the list.

Fixing the pages between product and checkout is a big part of what our Shopify web design team does on existing stores.

Retention Metrics That Show If Customers Come Back

Retention metrics show whether customers come back. That decides how much each one is worth over time.

These 3 measure it:

13. Returning Customer Rate

Returning customer rate is the percentage of your customers who've ordered more than once.

In Shopify's reports, a returning customer is anyone placing an order whose history already includes at least one earlier order.

I love seeing this number climb, because a rising rate makes every new customer more valuable.

To push it up, our Shopify email marketing team builds welcome, post-purchase, and win-back flows that turn a first order into a second one.

14. Customer Lifetime Value (LTV)

Customer lifetime value (LTV) is the total revenue a customer brings in over their whole relationship with your brand.

A simple version is average order value times orders per year times the number of years they keep buying. A customer who spends $60 three times a year for 2 years has an LTV of $360.

Want a stricter number? Use gross profit in place of revenue. That version tells you what a customer is really worth to the business.

15. LTV to CAC Ratio

LTV to CAC ratio compares what a customer is worth to what it cost to win them.

Divide LTV by CAC. A $360 LTV against a $90 CAC gives you a 4:1 ratio.

Below 1:1, you lose money on every customer you win. The higher the ratio, the more room you have to spend on growth.

In my experience, the brands that scale fastest online know this number cold.

Vanity Metrics That Mislead Shopify Brands

Vanity metrics are numbers that look great in a report but don't tell you whether you're making money.

These are the ones I see brands obsess over most:

• Platform ROAS on its own: It can look strong while total sales fall, because each platform counts sales it only partly caused.
• Cost per click and cost per 1,000 impressions (CPM): Cheap clicks and cheap impressions mean nothing if those people never buy.
• Sessions and traffic: More visitors only matter when they turn into orders at a healthy cost.
• Followers and likes: An engaged audience is nice to have, but it doesn't pay for inventory.
• Revenue on its own: Sales that come with shrinking margins can leave you with less cash at the end of the month.

So should you ignore these numbers completely? No.

I still use them to diagnose problems inside an ad account. Just judge success by the profit metrics above.

How Ecommerce Metrics Work Together

No single metric gives you the full picture, because each one moves the others.

Here's what that looks like in a real account.

Remember the brand where paid search drove 85% of revenue?

Before we scaled its spend, we set 90-day targets and tracked the actual results against them:

Revenue landed just under target.

Cost per purchase beat the goal, though. That gave us room to scale ad spend from $7,500 to $20,000 a month over those 3 months.

When one number moves, check the ones around it:

• MER drops: See whether ad spend grew faster than sales, then check your new customer share.
• CAC climbs: Look at CTR for tired creative, then at conversion rate for product page problems.
• Conversion rate falls: Check add-to-cart rate and cart abandonment to find where shoppers leave.
• Returning customer rate slips: Review your email flows and what customers experience after their first order.

Building this kind of target sheet is part of our Shopify marketing strategy work. Every plan includes a KPI and measurement plan and names the profit target we hold ourselves to.

Which Ecommerce Metrics Matter Most at Each Growth Stage

The right metrics depend on where your brand is today.

Here's where I'd focus at each stage:

• Just launched: Focus on CTR, add-to-cart rate, and conversion rate. You need proof that your ads get clicks and your store turns them into orders.
• Scaling ad spend: Focus on CAC, MER, and new customer share. Your job is to grow spend without letting the cost of each new customer run away.
• Established: Focus on contribution margin, returning customer rate, and LTV to CAC. Growth now comes from protecting margin and getting more from the customers you already have.

Half Baked Cookies is a good launch-stage example. The brand went from $0 to $10,000 a month in Shopify sales within its first 90 days, while our team tested more than 75 ads in that window.

On the established end, The Sausage Maker's results show what steady, profitable growth looks like. Alongside our partner Renoun Creative, we helped turn the brand's 30% yearly drop in ecommerce revenue into 15% annual growth.

The brand reported a 13.8 average MER in 2023 while it grew.

How Often You Should Check Your Ecommerce Metrics

Check too often? You'll make panic changes.

Check too rarely? Small problems run for weeks.

Before we set targets for any brand, we look back at the past 12 months of Shopify and ad data. Your own history is the most useful benchmark you have.

Here's the simple review rhythm I'd start with:

Pulling everything into one place saves hours.

Our ecommerce marketing services put every channel into one real-time dashboard, so your blended return, new-customer cost, and top products sit side by side. We walk through it with you on a call every 2 weeks.

Frequently Asked Questions (FAQs)

These are the questions Shopify brand owners ask most about ecommerce metrics:

How Many Ecommerce Metrics Should a Small Store Track?

Start with 5: MER, CAC, conversion rate, AOV, and returning customer rate. That set covers profit, acquisition, your store, and retention. Add more once you're spending on ads every month.

What Is a Good Conversion Rate for an Ecommerce Store?

It depends on your category and price point. According to Shopify's benchmark roundup, global averages sit between 1.4% and 2.66% (as of the time of writing). Your own past performance is still the best benchmark.

What Is the Difference Between MER and ROAS?

ROAS compares one ad platform's reported sales to the spend on that platform. MER compares your total store revenue to your total ad spend. Use ROAS to manage campaigns and MER to judge the business.

What Is a Good MER for a Shopify Store?

There's no universal number, because it depends on your margins. A brand with 70% gross margins can stay profitable at a lower MER than a brand with 40% margins. Work out the MER where your contribution margin breaks even, then set your target above it.

Where Can You Find Your Ecommerce Metrics in Shopify?

In your Shopify admin, go to Analytics, then Reports. Use the Category filter to narrow the list, like choosing Customers to see your customer reports. Ad metrics like CTR and ROAS live in Meta Ads Manager and Google Ads.

How Interlace Digital Turns Your Metrics Into Growth

Numbers only help when they change what you do next.

Pick a few that fit your stage, give each one a target, and check them on a steady schedule.

That's our work at Interlace Digital. We're a Shopify growth partner that runs Meta and Google ads, creates fresh ad creative every month, and designs Shopify pages that turn visitors into buyers.

Every brand gets a custom dashboard and clear profit targets. We track total sales against total ad spend, so you always know if your ads are making money.

Want to know which numbers to fix first? Book a free discovery call with our team and get a clear plan for profitable growth.

Happy scaling.