You're paying for ads. Every month, your agency or platform sends over a report packed with numbers — clicks, impressions, ROAS, CTR, conversion rate. It looks thorough. It might even look impressive.

But here's the uncomfortable truth: a paid media report can be technically accurate and still be completely misleading.

Not necessarily through dishonesty — though that happens too — but through selective emphasis, vanity metrics, and the very human tendency to show the numbers that make the work look good.

This guide is for business owners who want to cut through the noise. You don't need to become a PPC expert. You just need to know which numbers actually connect to profit — and which ones exist to fill a slide deck.

The difference between activity metrics and outcome metrics

The first thing to understand is that not all metrics are created equal. There are two broad categories:

Activity metrics tell you what happened with your ads — how many times they were shown, clicked, or engaged with. Impressions, clicks, CTR (click-through rate), reach, and frequency all fall into this bucket.

Outcome metrics tell you what happened to your business — leads generated, sales completed, revenue driven, cost per acquisition. These are the numbers that actually matter.

Activity metrics aren't useless — they provide useful context when something's going wrong, or help diagnose why performance has changed. But if your monthly report leads with impressions and click volume without connecting those back to sales or leads, that's a red flag.

Ask yourself: does this report tell me whether I made money from my ads this month?

ROAS looks great — until you factor in your margins

ROAS — Return on Ad Spend — is one of the most cited metrics in paid media. A 5x ROAS sounds excellent. For every £1 you spend on ads, you get £5 back in revenue. Job done, right?

Not quite. ROAS measures revenue against ad spend — but it doesn't account for the cost of the goods you sold, your fulfilment costs, returns, platform fees, or the management fee you're paying your agency.

A simple example: if you sell a product for £100, it costs you £60 to make and ship, and you spend £15 on ads to generate that sale, your ROAS is 6.67x — impressive on paper. But your actual profit on that transaction is £25. Now add an agency fee, and you might be at break-even or worse.

The metric you should be asking about is MER (Marketing Efficiency Ratio) or at minimum, a blended CPA (cost per acquisition) that your agency can clearly connect to your margin. If they can't tell you what a profitable ROAS looks like for your specific business, that's a conversation worth having.

Conversion tracking: if it's broken, every number is wrong

This is probably the most overlooked issue in paid media reporting, and it's a big one.

If your conversion tracking isn't set up correctly — or if it's tracking the wrong events — then every single performance metric downstream of that is unreliable. You might be being told you generated 200 leads this month when the actual figure is 80. You might be attributing sales to the wrong campaigns. You might be optimising your budget towards ads that aren't actually responsible for the results.

Common conversion tracking problems include:

  • Tracking page views instead of actual form submissions or purchases
  • Counting the same conversion multiple times (especially common with GA4 imports)
  • Tracking test events that weren't removed after setup
  • Using all conversions in optimisation instead of primary conversions only

A quick sanity check: do the conversions reported in your paid media dashboard broadly match the enquiries or sales you're actually receiving? If there's a significant discrepancy, it's worth investigating before drawing any conclusions from the data.

The metrics agencies love to lead with (and why)

To be fair to most agencies: they're not deliberately trying to mislead you. But every business — including paid media agencies — has an incentive to present their work in the best possible light. That naturally shapes which metrics end up at the top of a report.

Here are the metrics most commonly used to make performance look better than it is:

Impression share

A high impression share tells you your ads are appearing frequently relative to the total available impressions. That sounds positive — but impression share says nothing about whether those impressions are converting. You can have 90% impression share and still be losing money on every click.

CTR (click-through rate)

A high CTR means people are clicking your ads. That's useful to know — but clicks cost money, and if the people clicking aren't converting, a high CTR is actually a problem in disguise. Always look at what happens after the click.

Quality Score improvements

Quality Score is a Google Ads diagnostic metric — it reflects ad relevance, expected CTR, and landing page experience. Improving it can lower your CPCs over time, which is genuinely useful work. But leading with it as a success metric without any corresponding improvement in conversions or revenue is a way of showing effort without demonstrating results.

View-through conversions

This one is particularly common in Meta and display advertising. A view-through conversion counts someone who saw (but didn't click) your ad and later converted. The attribution window is often 24 hours or longer, which means you can end up claiming credit for sales that had nothing to do with your ads at all. Be very sceptical of any report that includes view-through conversions in its headline number.

Questions you should be asking about your report

You don't need to understand every number in a paid media report. But there are a handful of questions that will cut straight to whether your ad spend is actually working:

  • How many leads or sales did my ads generate this month — and how does that compare to last month and the same period last year?
  • What did it cost me to acquire each of those customers (CPA), and is that number sustainable given my margins?
  • Which campaigns or channels are driving the most valuable outcomes — not just the most clicks?
  • Is the conversion tracking set up correctly, and are we confident the numbers in this report reflect reality?
  • What's being recommended as a result of this data — and what would happen if we didn't do it?

A good paid media report doesn't just show you numbers — it explains what those numbers mean, connects them to business outcomes, and gives you a clear direction. If you're regularly receiving reports that feel impressive but leave you none the wiser about whether your money is working, that's worth addressing directly.

What a genuinely useful report looks like

For the sake of contrast, here's what reporting looks like when it's done well:

  • It leads with outcomes (leads, sales, revenue, CPA) — not activity (clicks, impressions, CTR)
  • It provides period-on-period context so you can see trends, not just snapshots
  • It's honest about what isn't working — not just a highlight reel
  • It separates brand traffic from non-brand traffic (the latter is where real growth happens)
  • It closes with clear recommendations — specific actions with a rationale, not vague promises to 'continue optimising'

The bottom line

Paid media reporting should give you confidence that your budget is being managed well — or the information you need to make changes if it isn't. If your current reports aren't doing that, you're not getting full value from your investment.

The metrics that matter most are the ones that connect directly to your business: cost per acquisition, revenue from ads, and return on your total investment. Everything else is context.

If you're reviewing a paid media relationship and want a second opinion on how your accounts are performing, a free PPC audit gives you an honest, independent view — including whether the reporting you're receiving is telling the full story.

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