Quick answer: AdWords conversion tracking records when a click becomes a lead or sale. You create a conversion action in AdWords, install the global site tag (gtag.js) sitewide, fire an event snippet on the thank-you page or via Google Tag Manager, then verify in real time and in reports. You can also import Google Analytics goals. Clean tracking is the foundation for Smart Bidding and honest ROI.
Without conversion data, you are left optimising for clicks. Clicks are not revenue. This guide covers the practical setup path as of early 2018, when AdWords is still the product name and the global site tag is the install path Google recommends alongside Tag Manager workflows.
Decide what counts as a conversion
Pick outcomes that match money or qualified pipeline:
- Purchase (thank-you page or ecommerce event)
- Lead form submit (thank-you page or success event)
- Phone call from ads (call extensions / call tracking)
- Key account signup
Avoid counting every button click as a conversion. Inflated conversions train bidding algorithms to buy cheap, empty actions.
If you also use Analytics goals, keep definitions aligned so AdWords and Analytics do not tell different stories. See Google Analytics goals and linking AdWords to Google Analytics.
Method A: AdWords tag on a thank-you page
1. Create a conversion action
In AdWords: Tools → Conversions → + (UI labels move slightly as the new AdWords interface rolls out; look for Conversions under tools).
Configure:
- Category (Purchase / Lead / etc.)
- Value (fixed, or different values if you pass them dynamically)
- Count (one vs every; usually “one” for leads, “every” for purchases)
- Conversion window
- Attribution model (data-driven if eligible; otherwise a sensible starting model)
2. Install the global site tag
AdWords provides a global site tag to place on every page. It looks like a gtag.js snippet with your conversion ID. Install it in the site header or through Tag Manager.
If you already run gtag.js for Analytics, follow Google’s instructions to reuse the tag and add the AdWords config rather than pasting conflicting duplicates.
3. Add the event snippet on the success page
On the thank-you page only, fire the event snippet that reports the conversion. Alternatively, fire it from Tag Manager when the thank-you URL loads or when a form success event occurs.
4. Test
- Click a preview or use AdWords’ conversion draft testing tools where available
- Complete a conversion yourself
- Check Tools → Conversions status and the real-time / recent conversion views
- Confirm only one firing per submit (watch for double tags)
Method B: Import Analytics goals or transactions
If Analytics already tracks goals or Enhanced Ecommerce purchases reliably:
- Link AdWords and Analytics
- Import the goals or transactions as conversions in AdWords
- Choose which imported actions to include in “Conversions” column for bidding
This method reduces duplicate tagging when Analytics is already the source of truth. It inherits whatever measurement problems Analytics has, so fix those first. Enhanced Ecommerce setup is covered in our enhanced ecommerce article.
Method C: Google Tag Manager
GTM is often the cleanest long-term approach:
- One container on the site
- AdWords Conversion Tracking tags fired on triggers (thank-you pageview, form success event, purchase data layer event)
- Versioning and preview mode before publish
Use a data layer for purchase value and transaction ID when you can. Passing order ID as an order unique parameter helps deduplicate.
Lead forms without a thank-you URL
Many modern forms submit without changing URL. Options:
- Redirect to a thank-you page after submit (simplest for tagging)
- Push a data layer event on successful AJAX submit and fire the AdWords tag in GTM
- Use form-specific listeners carefully (fragile across plugin updates)
Whatever you choose, verify that refresh or back button does not re-fire the conversion. Tag Manager preview mode is the quickest way to watch the trigger fire once, and only once, per real submission.
Phone call conversions
If calls matter:
- Use AdWords call reporting for calls from ads
- Consider website call conversion tracking numbers if you need site calls attributed
- Keep offline conversion import in mind for sales closed later by phone (CSV upload of GCLID-tied leads)
Do not invent precision you cannot support. An honest lead conversion plus good CRM follow-up beats fake purchase tracking.
Values, currencies and micro-conversions
- Pass real order value for ecommerce when possible
- For leads, assign a conservative value based on close rate × average sale if you use value-based bidding
- Track micro-conversions (FAQ clicks) as separate actions not included in the primary Conversions column
A quick audit checklist
Run through this list whenever you change the site, the form plugin or the checkout:
- Is the global site tag on every page, once?
- Does each conversion action fire only on success?
- Does the purchase value match the order total, in the right currency?
- Are test orders and internal staff submissions excluded or easy to spot?
- Do the conversion counts in AdWords roughly match the leads or orders in your CRM or shop for the same period?
- Is someone named as the owner of tracking, so changes are not made blindly?
A short audit after every redesign or plugin update catches broken tags before weeks of bidding data are lost.
Common mistakes
Tag on every page as a conversion event. The global tag is sitewide; the event is not.
Counting form starts instead of completes.
Duplicate global tags from plugin + theme + GTM.
Ignoring consent and privacy. EU cookie rules and the approaching GDPR (May 2018) affect how you present tracking. Plan notices with your legal advice; do not assume marketing tags are exempt.
Optimising to imported Analytics goals that include branded organic self-visits or spam. Filter spam traffic and internal visits out of the Analytics view first.
Reading the numbers
After setup:
- Compare Conversions in AdWords with CRM or sales counts weekly
- Expect differences (windows, attribution, cookie loss, view-through settings)
- Use the Conversions column you optimise to consistently
- Give Smart Bidding enough conversion volume before judging it
If landing pages underperform, fix the page, not only the bid strategy. A focused landing page with a clear offer usually moves conversion rate more than another decimal place on CPC.
FAQ
Is the old conversion remarketing tag still required?
Follow the current AdWords instructions for your account. New setups should use the global site tag / GTM paths Google documents now.
How soon do conversions show?
Often within a few hours, sometimes sooner for testing. Bidding algorithms need more history than a single afternoon.
Should every conversion be included for bidding?
No. Include the actions that represent real value. Report secondary actions separately.
Does this work with WordPress form plugins?
Yes if you can redirect to a thank-you page or fire a GTM event on success. Test each form plugin’s behaviour after updates.
Track the outcomes that pay
AdWords conversion tracking is how you teach Google which clicks became leads and sales. Install the global tag cleanly, fire events only on success, verify against real records, and only then lean on automated bidding. If you want help wiring tracking and reporting so you can know what’s working, we can set it up and document it for your team.
