Guides · Reports and numbers
Google Ads Metrics Explained: The Five Numbers Worth Reading
By Josh Croom · October 27, 2026 · 10 min read
Google Ads metrics are the numbers that show where your ad money went and what it brought back, and five of them answer most of your questions: spend, impressions, clicks, conversions and cost per conversion. Read them in that order each month, and compare each one with your last three months instead of last month alone.
A big drop, and nothing broke
Monday, 9:05 AM. Your monthly report lands, and conversions are down by a third from last month. You start typing an email that asks what went wrong.
Then you pull up the last three months. August was high, September was low, and July sat right in between. Spend barely moved all summer, and the ads, the pages and the phone number never changed. You were reading one month of a number that moves a lot, and one month on its own can't tell you whether anything changed.
How much the numbers move
We measured how much spend and conversions changed from one month to the next on the paid ad accounts we manage, from July to September 2026.
- 32%typical monthly swing in conversionsthe median change from one month to the next
- 5%typical monthly swing in spendon the same accounts and months
- 3 monthsthe window we compare every number withso one odd month doesn't drive a decision
Why the order matters
Each number depends on the one before it, because your ad has to show before anyone can click it, and someone has to click before they can call you or fill out your form. Reading from the top down shows you where people drop off.
A problem near the top shows up in every number below it. Say a declined card stopped your ads for a week. Your impressions, clicks and conversions all drop along with the spend, and the fix has nothing to do with your ads or your website, so starting at the top keeps you from chasing that problem in the wrong place.
The five numbers, in order
Each number answers one question about your ads, so read them top to bottom every month, and write them down so next month has something to compare with.
Number 1
Spend, or Grant credit used
Spend is the money your ads put to work, and on paid ads you hold it next to your budget to see whether the account used what you planned. On a Google Ad Grant, it's how much of Google's credit you used, out of as much as $10,000 a month.
Number 2
Impressions, or times shown
Google counts one impression each time your ad shows on a search. One person who sees your ad three times counts three times, so this number measures how often you showed up rather than how many people saw you.
Number 3
Clicks and click rate
A click is a tap on your ad, whether it opens your site or dials your phone. Your click rate, or CTR, is your clicks divided by your impressions, so 5 clicks from 100 impressions gives you a 5% click rate.
Number 4
Conversions
A conversion is an action you've told Google to count, like a call, a form or a chat. On a Grant, many conversions are small steps, like reading a key page, and those steps help the Grant bid and put its credit to work.
Number 5
Cost per conversion
On paid ads, divide your spend by your conversions and hold the result up to what one new customer is worth to you, because a cost that looks high can still pay well when one job is worth a lot.
One impression, one click
This sample search ad is for a plumber. Each time it shows on a search like this one, Google counts an impression, and each tap on it counts as a click.
water heater repair near me
What each number really tells you
Impressions measure reach, not people. Your ad might show in a search result, on a map or on a partner site, and Google counts each showing once. Sometimes only part of the ad shows, like your business name on a map, and Google still counts that as an impression.
Your clicks won't match your website visits exactly. Google counts a click even when the person never reaches your site, maybe because your site was down for a moment. Google also filters out invalid clicks, like accidental taps or clicks from bots, and it doesn't charge you for them.
Average cost per click is your total click cost divided by your clicks. Google's own example uses two clicks, one at $0.20 and one at $0.40. Together they cost $0.60, so the average is $0.30 a click.
Conversion rate is conversions divided by the clicks and other interactions that led to them. In Google's own example, 50 conversions from 1,000 interactions give you a 5% conversion rate. If you count every conversion and one person calls twice, the rate can even pass 100%.
Google puts each conversion on the day of the click that led to it, not the day of the call or form. A call that comes in this week from last week's click shows up in last week's numbers, so the last few days of any report can still grow after you read it.
What a conversion looks like
Each conversion is a real action, like a call or a quote request. In your portal, each one sits on its own line with the time it came in and what it was about.
Calls and forms
Why the report won't match your call log
Tracking counts only the calls and forms it can connect to an ad. Your own count also catches the person who saw your ad on Monday and called a week later from memory, or the neighbor who heard your name from them. Both numbers are right, because they count different things.
Watch whether the two counts rise and fall together over a few months. If your phone got busier in a month when tracked calls went up, the tracking is doing its job. If your phone got busier while tracked calls fell, ask whoever runs your ads to check that tracking still counts every call and form.
Misreading the report and reading it well
How reports get misread
- Judging conversions by one month.
- Comparing a Grant's cost per action with a paid account's.
- Expecting the report to match your call log exactly.
- Treating every click as a website visit.
How to read it well
- Compare each number with your last three months.
- Judge a Grant by credit used and actions recorded.
- Check that tracked calls and your own calls move together.
- Expect a few clicks that never load the page.
What good looks like
What counts as good depends on the kind of account you run, because a Grant spends Google's credit and a paid account spends yours.
Quality Score is Google's 1 to 10 grade for each keyword. Google builds it from three parts: how likely people are to click your ad, how closely the ad matches the search, and how useful your landing page is to the people who land on it. Google calls it a diagnostic tool, not a goal, and says the score itself isn't used in the ad auction. Read it as a hint about which keyword, ad or page needs work.
| Number | What good looks like |
|---|---|
| Spend or Grant credit used | On a Grant, close to the full credit. On paid ads, close to your budget. |
| Impressions | Steady or growing over three months. |
| Clicks and click rate | On a Grant, rising toward Google's 5% ask; read it with Quality Score. On paid ads, steady or rising. |
| Conversions | A steady trend over three months. One month alone is noise. |
| Cost per conversion | Paid ads only: less than one new customer is worth to you. |
| Quality Score | More keywords near the top of Google's 1 to 10 scale over time. |
Reading the numbers on a Google Ad Grant
Google offers a qualifying nonprofit as much as $10,000 a month in search ads, so the first number to read on a Grant is how much of that credit you used. The goal is close to the full credit every month, which our Google Ad Grants guide explains in more depth.
Click rate carries more weight on a Grant than on paid ads. Google asks every Grant account to hold a click rate of at least 5% each month, and it measures that across the whole account rather than keyword by keyword. If an account misses two months in a row, Google turns it off until someone fixes it and asks Google to turn it back on.
Cost per conversion tells you very little on a Grant. Small steps count as conversions and Google pays for the clicks, which makes the cost per action look low next to a paid account. Judge a Grant by the credit it used and the actions it recorded instead. Our Google Ad Grants management page shows how we run that side.
Can you read your own report?
Answer four questions about the last report you got. Your answers stay on your device.
Do you know what you spent last month, and how it compares with your budget or your Grant?
Can you name exactly what counts as a conversion in your account?
Do you compare each number with your last three months, not just last month?
Do you know what one new customer or supporter is worth to you?
You already read your report the way we'd read it. Keep the three-month habit, because it stops one odd month from driving a big decision.
You're close to a solid monthly habit. Fix the first question you answered No before your next report arrives, because each one changes how you read the numbers below it.
Start with conversions, and ask whoever runs your ads to list exactly what counts as one, because every other number makes more sense once you know that.
Your five-minute monthly read
Run through this list each time a report arrives, and tick each step as you finish it. Your ticks stay on this device, so you can pick up where you left off.
0 of 6 done
How we report on Google Ads
When we run Google Ads management for you, your portal lists each call and form behind the conversion count, so you can check the number against your own records. Our results page shows our numbers across the accounts we run, along with what our clients say.
If your report leaves you with questions, book a call with Miguel. He'll walk through your numbers with you and show you which ones matter most for your business.
Questions people ask
What are the most important Google Ads metrics?
The five that answer most questions are spend, impressions, clicks, conversions and cost per conversion. Read them in that order, because each one depends on the one before it.
What's the difference between impressions and clicks?
An impression counts each time your ad shows on a search, and a click counts each time someone taps it. Your click rate is your clicks divided by your impressions.
Why don't my Google Ads conversions match our call log?
Tracking counts only the calls it can connect to an ad, while your own count also catches the person who called a week later from memory. Both numbers are right, so check that they rise and fall together.
Conversions dropped this month. Did something go wrong?
A drop in one month doesn't prove anything on its own. On our paid accounts from July to September 2026, a typical month's spend moved 5% while its conversions moved 32%, so review three months before you decide anything.
How should I judge a Google Ad Grant's numbers?
Judge it by how much of the credit it used and the actions it recorded. Small steps count as actions and Google pays for the clicks, so cost per action looks low and tells you little.
See how we manage and report on Google Ads
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