Google Ads Conversion Tracking: Set It Up and Count It Right

If you run Google Ads without conversion tracking, you can see clicks and spend but not which keywords, ads, ad groups or campaigns brought you a customer. Google says measuring conversions is what lets you judge return on investment, and it's also the signal that bidding strategies such as Maximize Conversions, target CPA and target ROAS feed on. Get this wrong and every automated decision after it rests on the wrong numbers.

Where conversions happen, and how each is counted

Google groups conversions into four places they can happen: your website, your app, phone calls and offline sales you upload. Each one has a default counting setting that applies if you don't choose one yourself.

Where it happens	Typical conversion	Default count
Website	Purchase, sign-up, form, button click	Every
Phone call from an ad or your website	A call that meets your minimum call length	One
App	Install or in-app action	One for installs, Every for in-app actions
Offline import	A sale from your CRM uploaded by file or API	Every
Imported from Analytics	A key event or transaction	Every for transactions, One for goals

Offline imports have two rules of their own. Google says uploads are processed in 24 to 48 hours, and the Google Click IDs in your file must be within 90 days. If your sales cycle runs longer than that, the click won't match.

Google tag or Google Analytics: pick your data source

When you create a conversion action, Google asks where the data should come from. There are two options, and you can use both for different actions.

• Google Analytics. If you already track events in Analytics, Google calls this the most efficient route because you reuse what's there. Only events marked as key events can be imported, you need Admin access in Google Ads and Edit access in the linked Analytics property, and new import options can take 24 to 48 hours to appear after you link the accounts or mark an event.
• The Google tag. A dedicated signal for Ads bidding. Google recommends it if you don't use Analytics, or if you want Ads-specific features such as enhanced conversions.

URL rules or code: two ways to track a website action

For website conversions, Google gives you a choice. Set up with URL is best for simple page-load tracking, such as counting anyone who reaches a page whose address contains thank-you, and needs no code changes once your tags are in place. Set up with code is required when you want to track button clicks, pass a value that changes, like a purchase amount, or record transaction IDs.

One warning from Google is worth taping to your monitor: if a plugin in your website platform already manages your tags, don't add them again by hand. Double-tagging causes duplicate conversion reporting,.

The Primary or Secondary setting that decides what Smart Bidding sees

Every conversion action is either Primary, which Google calls biddable, or Secondary, which is observation only. A Secondary action still shows up in your reports, but Smart Bidding doesn't optimise towards it.

Google's help page is blunt about it: configuring these correctly is critical, and misconfiguring them can prevent Smart Bidding from optimising effectively. If your real sale is Secondary and a newsletter sign-up is Primary, your campaigns will chase sign-ups. Google also recommends grouping related actions, such as a website purchase and an app purchase, into one conversion goal so the bidding gets a stronger signal.

Every or One: the counting choice for sales and leads

For each action you choose how many conversions to count after an ad interaction:

• Every counts every conversion. Google says this suits sales, where one customer buying three times is worth three sales.
• One counts one conversion per ad click. This suits leads, where the same person filling in your form twice is still one lead.

Check the defaults in the table above against what you sell. A lead form left on Every can double-count the same enquiry, and if that action is Primary, your bidding learns from inflated results. App installs are always counted as One and can't be edited.

How to set up a conversion action, step by step

1. In Google Ads, go to Goals, then Conversions, and create a conversion action.
2. Pick website, app, phone call or offline, and choose your data source: the Google tag, Google Analytics or both.
3. For a website action, choose a URL-based or code-based event.
4. Set the action as Primary or Secondary, choose Every or One, and add a value if you know what a conversion is worth.
5. Install the Google tag on every page of your site and add the event snippet to the conversion page.
6. Come back after up to 48 hours and check the Status column.

Where the Google tag and event snippet go

New conversion actions use the Google tag, which used to be called the global site tag. Google says it goes on every page of your site, usually in the head section. The event snippet goes only on the page where the conversion happens, such as your order confirmation page, and it sits after the Google tag. For calls, a phone snippet swaps the number on your site for a Google forwarding number so calls can be linked back to the ad.

If you set things up years ago, the previous conversion tracking tag still works, though Google recommends moving to the Google tag. If you use Tag Manager, you must link the Google tag in your container to the right Ads account. After any tag change, Google says it may take up to 48 hours for the conversion status to update.

Enhanced conversions: the add-on, not a replacement

Enhanced conversions sit on top of your existing tag. When someone converts, they send hashed first-party data, such as an email address, to Google using SHA256, where it's matched to signed-in Google accounts that engaged with your ads. There are two types: one for web sales and events, and one for leads, which combines website leads with offline lead conversions you import.

Two details from Google's page matter if you set this up. Email addresses are normalised before hashing, for example by removing full stops before the domain in gmail.com and googlemail.com addresses. And using a transaction ID helps keep duplicate conversions down.

After launch: check the status, then leave it alone

Your tag health lives under Goals, then Summary, in the Status column of the conversion actions table. If something looks wrong, Google recommends Google Tag Assistant for troubleshooting. If you're tracking phone calls, you can also adjust the minimum call length that counts as a conversion and read individual call durations in the Call Details report. If calls are your main lead source, a dedicated tool from my list of call tracking software can show more than Google's own report.

Once it's working, resist the urge to fiddle. Google says Smart Bidding needs a standard 7 to 14 day learning phase, and frequent changes to budgets, CPA or ROAS targets or conversion goals during that time reset the learning window.

To find what people search for before you spend, try Keyword Planner.

My verdict

Fix conversion tracking before you spend another penny on clicks. It's the cheapest fix in Google Ads and the one that costs the most when it's wrong. Start with your one most valuable action, make it Primary, choose Every for sales or One for leads, and check the Status column after 48 hours. Add enhanced conversions once the basics are clean. If your account already feels like it's leaking budget, my guide to where small business Google Ads budgets go to waste is the next thing to read, and if you're still planning your first campaign, start with my Google Ads for PPC guide.

Frequently asked questions

What is a conversion in Google Ads?

It's an action you choose to treat as valuable, like a purchase, sign-up or phone call, recorded after someone interacts with your ad.

What's the difference between Primary and Secondary conversions?

Primary conversions are biddable, so Smart Bidding optimises towards them. Secondary conversions are observation only: they appear in reports but don't guide bidding.

Should I count every conversion or one?

Google suggests Every for sales, because each purchase has value, and One for leads, because the same person converting twice is still one lead.

How long does Google Ads conversion tracking take to start working?

Google says it may take up to 48 hours for the conversion status to update after tag changes, and Analytics import options can take 24 to 48 hours to appear.

Do I need enhanced conversions?

They're optional. Enhanced conversions supplement your existing tag by sending hashed first-party data such as email addresses, and Google recommends the Google tag if you want them.