How to Read a Google Ads Report: Cost, Conversion Value and What to Ignore
A plain guide for store owners to the numbers in a Google Ads report: which ones matter, what conversion value really means, and which ones to skip.
To read a Google Ads report, start with two numbers: cost, which is what you paid Google, and conversion value, which is the revenue Google Ads conversion tracking recorded from those ads. Then ask three questions. Is the tracking right? How much of it came from people searching your brand name? Which products or searches drove it? Almost everything else in a report is detail. Some of it is useful. Some of it is noise.
Here is what each common number means, how to judge it, and what to skip.
The two numbers that matter most
Cost. What you spent with Google in the period. This is real money and it is exact. Start every report here.
Conversion value. The revenue Google Ads credits to your ads, based on your conversion tracking. On our site we call this tracked revenue. It is useful, but it is not the same as your store’s revenue, for three reasons:
- Google credits a sale to an ad if the shopper clicked or, in some cases, viewed an ad within a set window before buying. Some of those shoppers would have bought anyway.
- If tracking is set up wrong, the number can be inflated by duplicate tags, or by non-purchase actions counted as conversions.
- If tracking is broken, the number can be too low.
So treat conversion value as a strong signal, not a bank statement. Check it against your store’s orders regularly. If they move together, you can trust the trend.
The ratio everyone quotes
Most reports divide conversion value by cost and show the result as a ratio or percentage. It is a quick way to compare campaigns. But be careful with it in three ways:
- It ignores margin. A product with thin margin can show a good ratio and still lose money.
- It is inflated by branded search, where people were already looking for you.
- It says nothing about new customers versus repeat buyers.
Use it to compare parts of the same account, not as proof that the account is healthy.
Split brand from non-brand
This is the most useful thing you can ask for in any report. Branded searches, where people type your store’s name, are cheap and convert well. They make totals look strong. Non-brand searches, where people search for the kind of product you sell, are where new customers come from.
Ask for cost and tracked revenue split into:
- brand search
- non-brand search
- Shopping and Performance Max
Then you can see how much of the account is finding new demand. If your agency does not report this way, our guide to signs your Google Ads agency is wasting money explains why that matters.
The numbers worth a look
Conversions. The count of tracked purchases. Useful alongside conversion value to see average order value from ads.
Cost per conversion. Cost divided by conversions. Useful for comparing campaigns with similar products. Less useful when order values vary a lot.
Clicks and cost per click. Clicks tell you how much traffic you bought. Cost per click rises and falls with competition. Watch the trend, not the single number.
Conversion rate. Conversions divided by clicks. A sudden drop often means a tracking problem or a site problem, not an ads problem.
Search impression share. How often your ads showed when they could have. Low share on profitable searches can mean budget or bids are holding you back.
Product-level results. For a store, the most useful table in Shopping or Performance Max. Cost and tracked revenue per product shows where budget goes and what it earns.
The numbers to mostly ignore
Impressions on their own. How many times your ads were shown. Big numbers, little meaning without clicks and sales attached.
Click-through rate as a goal. Useful for judging ad copy within a campaign. Not a goal for the account.
Quality Score on its own. A diagnostic hint, not a result. A report that leads with it is filling space.
“All conversions.” This column includes actions beyond purchases. Use the main conversions column unless you know why you need the other.
Optimization score. Google’s own score for how many of its recommendations you have applied. Some recommendations are good. Many raise spend. A high score is not a measure of a good account.
Questions to ask about any report
- When was tracking last checked against store orders?
- How much of this revenue came from brand search?
- Which products and searches drove it?
- What changed this month, and what did each change do?
- What will you do next, and why?
A report that answers those five is a good report, whatever it looks like. A report full of charts that answers none of them is not.
What our dashboards show
On our results page we show dashboards from real accounts managed by Nathan Synoground, with client names withheld. They show cost and conversion value side by side. For example, across 12 ecommerce brands: $4.0M in Google Ads spend and $24.0M in tracked revenue. The source is Google Ads manager-account data from January 2018 to September 2026, readable accounts only.
We show cost and tracked revenue because those are the two numbers that matter, and we say plainly what tracked revenue means.
Want a second pair of eyes?
If your reports leave you unsure what is working, a free Google Ads audit will tell you. We check your tracking first, then the rest. To see what we report each week, read about our Google Ads management. For more on what a new agency should deliver early, see the first 90 days with a Google Ads agency, or go back to our ranking.