Marketing KPIs That Actually Matter: What We Track and Why

The marketing KPIs that matter are the ones tied to how the business makes money. For an ecommerce brand that usually means revenue, contribution margin after marketing, customer acquisition cost, return on ad spend or marketing efficiency ratio, average order value, conversion rate and repeat purchase. For a service business it means qualified enquiries, cost per qualified enquiry and the value of work won. Click-through rates, impressions and engagement help diagnose problems rather than measure results.

There is no universal target for any of these. A healthy return on ad spend for a high-margin product would bankrupt a low-margin one, and a "good" conversion rate depends on price, category, traffic mix and device. The useful question is what each number has to be for this business to make money, and whether it is moving in the right direction.

Start with the business model

Before choosing KPIs, work out a few basics:

• gross margin by product or service line
• fulfilment, shipping and payment costs per order
• how often customers buy again, and over what period
• for services, how many qualified enquiries become paying work, and what that work is worth

Those numbers turn marketing metrics into business decisions. Without them, a campaign can look successful on the platform dashboard while losing money on every sale.

Revenue and qualified enquiries

The top-line measure is the outcome the marketing exists to produce: revenue for ecommerce, qualified enquiries and work won for services. "Qualified" is the important word. A campaign that doubles form fills but brings enquiries the business cannot service has made things worse.

For services, we would always want the business to mark which enquiries were qualified and which became customers, so marketing can be judged on what actually matters. Our article on generating more qualified leads online covers how to track that.

Contribution margin

Revenue alone hides whether growth is profitable. Contribution margin after marketing (revenue minus cost of goods, fulfilment, payment fees and marketing spend) shows whether each extra dollar of sales is adding to the business or costing it. It is the number we would check before recommending more spend.

Customer acquisition cost (CAC)

CAC is total marketing spend to acquire new customers divided by the number of new customers acquired in the period. It is most useful when it separates new customers from returning ones, because returning customers who would have bought anyway make paid media look cheaper than it is.

Whether a CAC is acceptable depends on margin and repeat purchase. A business whose customers reorder every month can afford a much higher CAC than one that sells a single purchase every few years.

ROAS and MER

Return on ad spend (ROAS) is revenue attributed to ads divided by ad spend, usually as reported by each ad platform. It is useful for comparing campaigns within a platform. It is less reliable across platforms, because each one attributes sales using its own rules and windows, and several may claim the same order.

Marketing efficiency ratio (MER), total revenue divided by total marketing spend, is a blunter but more honest check on the whole picture. We use platform ROAS to make campaign decisions and MER to make sure the overall numbers agree with what the business is seeing in its bank account.

Average order value (AOV)

AOV is revenue divided by the number of orders. Raising it, through bundles, sensible thresholds for free delivery or better product recommendations, can make acquisition more affordable without spending more. It also needs watching alongside margin: a discount that lifts AOV can still lower profit per order. Our article on how we structure an ecommerce growth funnel shows where it fits in the wider customer journey.

Conversion rate

Conversion rate is orders (or enquiries) divided by sessions. It is a diagnostic as much as a KPI. A falling conversion rate can mean the site has a problem, or simply that more low-intent traffic is arriving. Break it down by device, traffic source and landing page before drawing conclusions.

Repeat purchase

The share of customers who buy again, and how quickly, is often the most under-watched number in ecommerce. It changes what the business can afford to spend on acquisition and shows whether the product and the post-purchase experience are working.

Non-brand search visibility

For SEO, the meaningful measure is growth in impressions, clicks and conversions from searches that do not include the brand name. Brand searches mostly come from people who already know you. Non-brand search shows whether the site is reaching new customers. Google Search Console gives this data by query and by page.

Channel metrics as diagnostics

Click-through rate, cost per click, cost per thousand impressions, engagement rate, bounce rate and email open rates all have a place. They help explain why the main KPIs are moving. A rising cost per acquisition might be caused by a falling click-through rate (the creative is tiring) or a falling conversion rate (the landing page or offer has a problem). Reporting them as results in their own right is where marketing reports start filling up with numbers that do not lead to a decision.

Make sure the data can be trusted

None of this works if tracking is wrong. Check that purchases or enquiries are recorded once, with the right value, in analytics and in each ad platform, and that the totals reconcile with the store or CRM. Google's guidance on key events in Google Analytics and Meta's Conversions API documentation explain how each platform receives conversion data.

A simple reporting structure

A useful monthly report usually fits on one page:

1. The outcome: revenue or qualified enquiries, against the previous period and the same period last year.
2. Profitability: contribution margin, CAC and MER.
3. Customer behaviour: AOV, conversion rate and repeat purchase.
4. Channel performance: spend and results by channel, with the diagnostic metrics that explain changes.
5. Decisions: what changes next month, and why.

The last section matters most. If a report does not lead to a decision, it is a record of activity. Our article on the ecommerce growth levers we review before increasing ad spend shows how these numbers feed into what we change.

If reporting gives you plenty of numbers but no clear decision, we can review what is being measured and what the business actually needs to know. Our paid media work starts with the measurement, and our ecommerce work connects it to the store.