Retargeting Metrics: 8 Numbers to Track (and How to Check Them)
The retargeting metrics that matter most are cost per sale (or lead) and return on ad spend, checked against your real orders. After those, watch conversion rate, click-through rate, frequency, view-through conversions, audience size and how many buyers are new. Retargeting reaches people who already visited your site, so many of them might have bought anyway. The real question is how many sales the ads caused. If you want someone to run and check it for you, see our retargeting management.
Do you ever look at a retargeting report that says your ads made 40 sales and wonder where those sales are? You are not alone, and you are right to ask.
We run retargeting for small businesses and online stores, and we check every sale it reports against the store's real orders. Here are the numbers we track, what each one tells you and how to tell if your retargeting is really working.
Which metrics should you track for retargeting?
Track these eight, starting with the ones at the top.
| Metric | What it tells you | What to watch for |
|---|---|---|
| Cost per sale or lead | What you pay for each customer | Count only sales your store or CRM confirms |
| Return on ad spend (ROAS) | Sales divided by ad spend | Compare it to your profit margin, not just to 1 |
| Conversion rate | How many clicks turn into a sale or lead | A drop often means the page they land on has a problem |
| Click-through rate (CTR) | How many people who see the ad click it | A falling CTR means people are tired of the ad |
| Frequency | How many times each person saw your ad, on average | Rising frequency with falling clicks means it is time for new ads |
| View-through conversions | Sales from people who saw the ad but did not click | Report them apart from click sales |
| Audience size | How many past visitors you can still reach | Too small, and the same few people see your ad over and over |
| New vs returning buyers | Whether the ads win new customers or just tag existing ones | Leave out people who already bought, unless you are selling them something new |
What is a view-through conversion?
A view-through conversion is a sale or lead from someone who saw your ad, did not click it, and then bought later on their own. Google Ads counts these for 1 day after someone sees the ad by default. Meta's attribution settings also include a 1-day view option.
View-through sales are why retargeting reports can look too good. The people you retarget have already been to your site, and many of them were coming back anyway. If your ad showed up on their phone that morning, the platform can take credit for the sale. So look at view-through sales on their own line, and judge the campaign mostly on sales from clicks.
What is ad frequency, and how high is too high?
Frequency is the average number of times each person saw your ad in a set time. Retargeting audiences are small, so frequency climbs fast.
There is no single number that is too high. Watch the trend instead. When frequency keeps rising and your click-through rate keeps falling, people have stopped noticing the ad, or they are getting annoyed by it. That is your sign to:
- Swap in new images or videos.
- Cap how often one person sees your ads, if the platform lets you.
- Stop showing ads to people who already bought.
- Shorten how long you follow people after they visit.
How do you know retargeting is really working?
The honest answer is to compare people who saw your ads with people who did not. Meta has a tool for this called Conversion Lift. It splits your audience into two groups, shows ads to only one, and measures the difference in sales. Meta does not charge extra for the test. As a guide, it needs a campaign from the past year with at least $5,000 in spend and 500 conversions.
Most small businesses do not have that volume yet. In that case, use these simpler checks:
- Match sales to real orders. Every sale the platform reports should be in your store or CRM.
- Look at click sales first. They are the clearest sign the ad did something.
- Check how many buyers are new. If most were already customers, the ads may just be taking credit.
- Watch your total sales, not just the ad report. If you pause retargeting and nothing drops, it was not adding much.
Why do your retargeting numbers not match your sales?
Usually for one of three reasons:
- Two platforms claim the same sale. A customer sees your Facebook ad, clicks a Google ad and buys. Both report the sale.
- View-through sales are mixed in. They count people who never clicked.
- The tracking counts twice. We checked the Meta pixel for an online store we work with. In one day, it reported 136 purchases. The store had 58 real paid orders.
That is why we check every reported sale against real orders before we call a campaign a winner.
Want retargeting you can trust?
You did not start your business to sort out ad reports. Our retargeting management starts at $250 a week, with the ads included, plus your ad spend (at least $1,500 a month). We check every sale it brings in against your real orders.
1. Talk to us about your site and goals. 2. We set up tracking and build your ads. 3. You get a report and a call every month, checked against your real sales.
Sources
- Google Ads Help, About conversion windows (checked November 2026)
- Meta Business Help Center, About attribution models and attribution settings (checked November 2026)
- Meta Business Help Center, About Conversion Lift (checked November 2026)
What to do next
Open your last retargeting report and find the sales from clicks, then match them to your real orders. That one check tells you more than any dashboard, and it keeps your ad money working for your website, your hardest-working employee.
Keep reading: What is retargeting? | What is PPC?