The Metrics That Look Healthy Right Before a Business Breaks

ROAS can be up while AOV is collapsing. New revenue can be up while repeat customer revenue is dropping. Traffic can be up while conversion rate is rotting. 

Metrics that feel like progress aren’t the same as the metrics that predict whether your business is actually healthy. 

Unfortunately, by the time many CEOs and marketing managers notice, the problem has already hit their bank account.

The 5 KPIs That Tell You If Your Shopify Business Is Actually Healthy

Many Shopify stores are forced to run half-blind. Our data is scattered across Shopify, Meta, Google, Microsoft, Amazon — and nothing tells us, in one place, whether the business is actually healthy this week.

An operator’s job isn’t watching outputs. It’s catching the real problems early: rising acquisition costs, falling AOV, declining new customer revenue, margin compression, ad fatigue…

But if you track these 5 KPIs weekly and you’ll know exactly where to cut spend, where to push, and what’s quietly breaking before it’s too late.

The Solution: The 5 KPIs That Matter Most

These are 5 of the most important KPIs Ezra Firestone looks at every Monday morning when reviewing his $200M ecommerce business.

1. Average Order Value

Why it predicts health: AOV tells you how much revenue you’re getting from each order, and it affects almost everything downstream: ad efficiency, margin, CAC tolerance, and how much room you have to scale.

What good looks like: You want AOV stable or trending up year over year, and many healthy Shopify brands can lift AOV through better upsells, bundles, free shipping thresholds, and offer strategy.

What to do if it’s red: Check your pre-purchase offers, post-purchase upsells, bundles, and product pairings first, because an AOV drop is often an offer problem before it’s a pricing problem.

“Increase AOV and ROAS goes up automatically — then you can afford to outbid competitors, buy more customers, and really scale.” — Ezra Firestone

2. Marketing Spend as a Percentage of Net Sales

Why it predicts health: This shows how much of your revenue is going back into customer acquisition, which matters because a store can grow revenue while becoming harder to run profitably.

What good looks like: Ezra wants this under 30%; 30–35% is a warning zone, and anything above 35% usually means your margin is getting squeezed.

What to do if it’s red: First check whether spend went up or revenue went down, then look at AOV, conversion rate, CPMs, creative performance, and any channels where spend increased without a matching lift in sales.

“The one thing that isn’t fixed is your cost of marketing. Your cost of marketing is the most variable line item.” — Ezra Firestone

3. New vs. Repeat Customer Revenue

Why it predicts health: This tells you whether the issue is acquisition, retention, or both, which matters because those problems require completely different fixes.

What good looks like: Many healthy brands land around 50–70% new customer revenue, but the trend matters more than the exact number because every category behaves differently.

What to do if it’s red: If new customer revenue is down, audit ads, creative, offers, landing pages, and traffic sources; if repeat revenue is down, review email/SMS flows, winback campaigns, replenishment timing, customer support, and the post-purchase experience.

4. Discount Percentage

Why it predicts health: Discount percentage shows whether you’re giving away too much margin to make the sale, which can be easy to miss when revenue still looks fine.

What good looks like: A normal range is often around 10–15%, especially if you run a welcome offer or evergreen promo.

What to do if it’s red: Look for leaked codes, stacked discounts, old promos still running, or automatic offers applying where they shouldn’t, because one small discount issue can quietly reduce profit across hundreds or thousands of orders.

5. Trailing 4-Week Year-Over-Year Trend

Why it predicts health: One week can be misleading, but a trailing 4-week year-over-year view gives you a cleaner read on whether the business is actually improving, flat, or starting to slide.

What good looks like: A +5% year-over-year trend is healthy, 0–5% is stable, and negative for multiple weeks in a row means it’s time to investigate.

What to do if it’s red: Don’t panic over one bad week; use this as the signal to dig into AOV, marketing spend, customer mix, discounts, and conversion rate. The trailing trend tells you whether you have a problem; the other 4 KPIs tell you which problem.

How These 5 KPIs Connect

These KPIs work best as a system, not five separate numbers.

AOV helps explain marketing efficiency, discount percentage helps explain margin issues, and new vs. repeat customer revenue tells you whether the problem is coming from acquisition or retention.

Then your trailing 4-week year-over-year trend is a master signal that shows whether it’s a one-week blip or something that actually needs attention.

Get the Weekly KPI Spreadsheet

These 5 KPIs are the priority lens; but the free Weekly KPI Spreadsheet gives you the executable version.

You’ll get pre-built Y/Y comparisons, automatic flag colors when any metric drops more than 5%, and the full 20+ metric breakdown across Shopify, Meta, Google, Microsoft, and Amazon.

It also includes a 10-minute walkthrough from Ezra and an AI prompt that pulls your weekly data automatically—the same sheet Ezra uses every Monday morning to run his 8-figure brands.

[Download the Free Weekly KPI Spreadsheet]