A lot of small businesses launch Google Ads first and "sort tracking later." That creates problems. Leads are missed. Bad conversions are counted. Phone calls aren't attributed. Forms are double counted. Google optimises toward weak signals. And nobody knows what's actually working.
Conversion tracking is not a nice to have technical extra. It's the scoreboard. Without it, you can't answer the questions that matter: which keywords are producing leads? Which ads are working? What's your real cost per lead? Is Google Ads actually profitable?
Running Google Ads without conversion tracking is like paying for a scoreboard, then turning it off during the game.
This guide covers what to track, how to set it up with Google Tag Manager, how to track forms, calls and purchases and how to verify it's all working before you spend real money.
What Must You Track in Google Ads?
Action: For most Melbourne small businesses, track these: Form submissions (contact, quote request, booking). Phone calls from ads (using Google forwarding numbers). Phone clicks from the website (tap to call on mobile). Quote requests and bookings. Purchases and transactions (ecommerce). Qualified leads where possible (CRM data). |
Primary vs Secondary Conversions
| Type | What It Means | Examples |
| Primary | Actions you want Google to optimise for. These drive bidding. | Form submission, phone call (with duration), purchase, booking |
| Secondary | Useful observations. Track them, but don't let them drive bidding. | Phone click, newsletter signup, brochure download, page view |
Warning: Not every website action should be a primary conversion. If you mark weak actions (page views, button clicks, newsletter signups) as primary conversions, Google will optimise toward getting more of those instead of real leads. The dashboard will look great. The leads will not. |
Track everything useful. Only optimise for what actually matters.
What Conversion Tracking Actually Does
Conversion tracking connects an ad click to an action the user takes later. Someone clicks your ad, lands on your page, fills in a form. Conversion tracking records that form submission and attributes it back to the specific keyword, ad and campaign that produced it.
Without tracking, you know:
How many clicks you got
How much you spent
Which keywords got impressions
With tracking, you also know:
Which keywords produced real leads (not just clicks)
Which ads drove form submissions and calls
What your cost per lead actually is
Which campaigns are profitable and which are wasting money
What Google should optimise toward with Smart Bidding
This is why tracking is listed as one of the hidden costs that affect Google Ads results. The $50-$150/month for call tracking is the difference between guessing and knowing.
The Main Conversion Types for Small Businesses
Here's what most Melbourne businesses should be tracking and how.
| Conversion | Primary? | Best Tracking Method | Who Needs It | Notes |
| Contact form | Yes | Thank you page or dataLayer event | All service businesses | Core lead action |
| Phone call from ad | Yes | Google forwarding number | Service businesses, tradies | Use duration threshold (30s+) |
| Phone click | Secondary | tel: click trigger in GTM | Mobile heavy campaigns | Click does not equal a completed call |
| Quote request | Yes | Form submission event | Trades, professional services | High intent lead |
| Booking | Yes | Booking platform integration | Clinics, consultants | May need custom setup |
| Purchase | Yes | Purchase event + value + ID | Ecommerce | Needs transaction ID for dedup |
| Newsletter signup | Secondary | Form/event trigger | Content businesses | Not a lead. Don't optimise for it. |
| Page view | No | Built in analytics | Observation only | Never use as primary conversion |
Before You Set Anything Up: Create a Tracking Plan
Before opening Google Tag Manager, answer these questions.
What counts as a real lead? A form submission? A phone call over 30 seconds? A booking completion? Define this clearly.
What is a soft action vs a hard action? A newsletter signup is soft. A quote request is hard. Google should optimise for the hard ones.
Which actions should Google optimise for? These become your primary conversions. Only include actions that represent genuine business outcomes.
Do calls matter for your business? For most service businesses, yes. If you don't track calls, you're underreporting conversions by 30-50%.
Does the sale happen online or offline? If leads close later (quotes, consultations, booked jobs), consider offline conversion imports from your CRM.
Tip: Plan before you build Fifteen minutes of planning saves hours of fixing. Write down every action you want to track, whether it's primary or secondary and how you'll measure it. Then build. |
Google Tag vs Google Tag Manager: Which Should You Use?
Google Tag (Direct Install)
The Google tag can be installed directly on your website for conversion tracking. It's simpler but less flexible. You add the tag code to every page, create conversion actions in Google Ads and the tag reports back when those actions happen.
Good for: Very simple setups with one or two conversion actions. Businesses without developer access who need a quick solution.
Google Tag Manager (GTM)
GTM is a container that lets you add and manage multiple tags without editing your website code each time. You install GTM once, then manage everything (Google Ads tracking, Analytics, Facebook pixel, etc.) through the GTM interface.
Good for: Most serious Google Ads setups. Businesses tracking forms, calls, purchases and multiple events. Anyone who wants to test, update and maintain tracking without a developer each time.
Action: Recommendation for most businesses Use Google Tag Manager. It's cleaner long term, easier to test with Preview mode, easier to update and handles multiple tags without cluttering your site code. The initial setup takes a bit longer, but it pays for itself in flexibility. |
Setting Up the Foundation in Google Tag Manager
Here's the foundational setup that every Google Ads account using GTM needs.
Step 1: Create or Access Your GTM Container
Go to tagmanager.google.com
Create an account and container for your website
Install the GTM container code on every page of your site (two snippets: one in the head, one after the body tag)
Verify the container loads by checking GTM Preview mode
Step 2: Add the Conversion Linker Tag
The Conversion Linker tag stores ad click information in first party cookies so conversions can be attributed back to the click that started the visit.
In GTM, create a new tag
Choose "Conversion Linker" as the tag type
Set the trigger to "All Pages"
Save and publish
Warning: Don't skip the Conversion Linker Without it, conversion attribution can be less accurate, especially as browsers restrict third party cookies. It takes 30 seconds to set up. There is no reason not to have it. |
Step 3: Create Your Conversion Action in Google Ads
Go to Google Ads > Goals > Conversions > New conversion action
Choose "Website" as the source
Configure the conversion (name, category, value, count)
Copy the Conversion ID and Conversion Label (you'll need both for GTM)
Step 4: Create the Google Ads Conversion Tracking Tag in GTM
In GTM, create a new tag
Choose "Google Ads Conversion Tracking" as the tag type
Paste the Conversion ID and Conversion Label from Step 3
Set the trigger (this depends on what you're tracking, covered in the next sections)
Test in Preview mode before publishing
How to Track Form Submissions
Form tracking is the most common conversion type for Melbourne service businesses. There are three main methods.
Option A: Thank You Page Tracking (Simplest)
Works when your form redirects to a unique URL after submission (like /thank-you/ or /quote-request-thank-you/).
Create a conversion action in Google Ads (copy the Conversion ID and Label)
In GTM, create a Google Ads Conversion Tracking tag with those details
Set the trigger to fire on the thank you page URL (Page View trigger where Page Path contains /thank-you/)
Test in GTM Preview mode: submit a real test form and confirm the tag fires
Check Google Ads conversion diagnostics 24-48 hours later
Pros: Clean, simple, reliable. Hard to misfire.
Cons: Only works if the form redirects to a unique page. If someone bookmarks the thank you page and visits later, it could record a false conversion.
Option B: Form Submission Trigger
Works when the form doesn't redirect to a new page (AJAX forms that show a confirmation message inline).
In GTM, use the built in Form Submission trigger or a Click trigger on the submit button. This fires when the form is submitted without needing a redirect.
Pros: Works without a thank you page.
Cons: Can misfire if forms use custom scripts, AJAX or dynamic validation. Must be tested carefully.
Option C: Custom DataLayer Event (Cleanest)
Your developer pushes a custom event to the GTM dataLayer when a form is successfully submitted. GTM picks up the event and fires the conversion tag.
Pros: Most reliable. Only fires on genuine successful submissions. Works with any form type.
Cons: Needs developer involvement to implement the dataLayer push.
A thank you page is often the simplest setup. A dataLayer event is often the cleanest. A generic form trigger is often the easiest to mess up.
How to Track Phone Calls
For most Melbourne service businesses, phone calls are 30-50% of leads. If you don't track them, you're underreporting conversions by a third or more.
1. Calls From Ads (Call Assets)
When someone calls directly from a call asset in your ad (without visiting your website), Google can track this using a Google forwarding number.
Set up a call conversion action in Google Ads
Enable call assets on your campaigns
Google replaces your number with a forwarding number in the ad
Set a minimum call duration threshold (30 seconds is common) to filter out hangups and wrong numbers
This tracks the call, the duration, the keyword that triggered it and the campaign it came from.
2. Calls From Website Visits
When someone clicks your ad, visits your website, then calls the phone number on the page. Google can track this using website call tracking, which dynamically replaces your phone number with a forwarding number for visitors who came from an ad.
Set up a website call conversion action in Google Ads
Add the phone snippet code via GTM (the number entered must match the exact digits displayed on your site)
Google replaces the number for ad click visitors only
The call is attributed back to the specific keyword, ad and campaign
Tip: Use call tracking software for better data Tools like CallRail, WhatConverts or CallTrackingMetrics give you call recordings, lead scoring and source attribution beyond what Google's built in tracking offers. The $50-$150/month cost is usually worth it for service businesses where calls are a major lead source. |
3. Phone Click Tracking
Tracks when someone taps a clickable phone number (tel: link) on your website. This is easier to set up but less reliable than actual call tracking.
In GTM, create a Click trigger that fires when the click URL contains "tel:" and use that to fire a conversion tag.
Warning: A phone click is not always a completed call. Someone can tap the phone number and cancel before dialling. Or the call can last 3 seconds (wrong number). If call quality matters, use actual call tracking with duration thresholds rather than relying only on click tracking. |
How to Track Purchases (Ecommerce)
For ecommerce businesses, purchase tracking needs to capture the transaction value, not just the fact that a purchase happened.
What to pass with the conversion:
Transaction value: The actual order amount. This lets you calculate ROAS (return on ad spend) accurately.
Currency: AUD for Australian businesses.
Transaction ID: A unique order ID. This prevents duplicate conversions if someone refreshes the confirmation page.
For Shopify, WooCommerce and similar platforms, there are often built in integrations or plugins. But always verify that the values passing are correct (check whether tax and shipping are included or excluded consistently).
Ecommerce tracking is not done when the purchase event fires. It is done when the order value, currency and transaction ID are all correct and not duplicating.
Enhanced Conversions: When to Consider Them
Enhanced conversions improve measurement accuracy by sending hashed first party customer data (email address, phone number) alongside the conversion tag. This helps Google match conversions to ad clicks even when cookies are limited.
When enhanced conversions are useful:
Lead generation where the conversion happens on a form (the email/phone submitted gets hashed and sent)
Ecommerce where customer data is available at checkout
Any campaign where cookie restrictions are affecting attribution accuracy
Important considerations:
Privacy: enhanced conversions use hashed data, but you still need to comply with the Australian Privacy Principles regarding data collection and consent.
Get basic tracking working and verified first. Enhanced conversions are an improvement layer, not a starting point.
If your basic conversion tracking is already clean and accurate, enhanced conversions can improve match rates and attribution. If your basic tracking is broken, enhanced conversions won't fix that.
How to Verify Conversion Tracking Is Working
Setting it up is half the job. Verifying it works is the other half. Do this before spending real money.
Verification Checklist
| # | Check | Pass | Fail |
| 1 | GTM Preview mode confirms conversion tag fires on the correct action | □ | □ |
| 2 | Form submission fires the tag only once (not on page load) | □ | □ |
| 3 | Phone click trigger fires correctly on tel: links | □ | □ |
| 4 | Website call forwarding number matches your displayed number exactly | □ | □ |
| 5 | Purchase value and currency pass correctly (ecommerce) | □ | □ |
| 6 | Transaction ID is present and unique per order (ecommerce) | □ | □ |
| 7 | Primary and secondary conversion settings are correct | □ | □ |
| 8 | Google Ads conversion diagnostics show "Recording conversions" (check 24-48hrs after) | □ | □ |
| 9 | Conversion count in Google Ads roughly matches actual leads received | □ | □ |
| 10 | No duplicate conversions firing from the same action | □ | □ |
Scoring:
All 10 pass: You're ready to launch with confidence. 7-9 pass: Fix the failures before increasing spend. Under 7: Stop and rebuild tracking. You're flying blind.
Common Google Ads Tracking Mistakes
This section exists because we audit accounts regularly and see the same problems over and over.
| Mistake | Why It Hurts |
| Tracking page views as leads | Inflates conversion volume. Google optimises for page visits, not real enquiries. |
| Missing phone call tracking | Under reports real leads by 30-50%. Google can't optimise for calls it can't see. |
| Duplicate form conversions | Makes CPL look falsely low. You think you have 20 leads when you have 10. |
| No Conversion Linker | Attribution becomes less accurate as browsers restrict cookies. |
| Wrong primary conversions | Bidding optimises toward newsletter signups or page views instead of real leads. |
| Treating phone clicks as calls | A click on a phone number is not a completed call. Over counts conversions. |
| Tag fires on every page | Records a "conversion" on every page load. Makes all data useless. |
| No transaction ID (ecommerce) | Page refreshes create duplicate purchase conversions. ROAS becomes unreliable. |
| Tracking breaks after site update | Nobody checks. Weeks of spend have no conversion data. Can't optimise. |
Bad tracking is worse than no tracking because it gives you confidence in the wrong numbers.
Conversion Tracking by Melbourne Business Type
Tradies and Emergency Services
Must track:
Calls from ads (with 30 second duration threshold)
Calls from website (forwarding number or call tracking software)
Quote request forms
Calls are often 60-70% of leads for tradies. If you only track forms, you're missing most of your conversions.
Clinics (Dentist, Physio, Psychologist)
Must track:
Appointment booking completions
Phone calls
Enquiry form submissions
If your booking system is third party (HotDoc, Cliniko, etc.), check whether the booking completion can be tracked as a conversion. Some need custom setup.
Professional Services (Accountant, Lawyer, Consultant)
Must track:
Enquiry forms and consultation bookings
Phone calls with duration
Qualified lead stages from CRM (if available)
Professional services often have longer sales cycles. Consider offline conversion imports to feed closed deal data back to Google.
Ecommerce
Must track:
Purchase event with dynamic revenue value
Transaction ID for deduplication
Cart and checkout events as secondary conversions
Always verify that purchase values match actual order totals. A common error: tracking the product price but not including the quantity.
How Tracking Connects to Optimisation and CPL
The Google Ads maths only works if conversions are real. Budget / CPC = Clicks. Clicks x CVR = Leads. Spend / Conversions = CPL. If conversions are inflated by duplicate tracking or weak actions, your CPL looks better than reality. If conversions are undercounted because calls aren't tracked, your CPL looks worse than reality. |
The Budget Calculator only works if the conversions being counted are real. And your agency can only optimise toward the right outcomes if the tracking tells the truth.
For what a healthy CPL looks like for your industry and how to calculate break even, see our guide on what makes a good cost per lead.
Tracking Maintenance: What to Check Monthly
Conversion tracking is not set and forget. Every website update is a chance to break it.
Monthly tracking health check:
Submit a test form and verify it records as a conversion
Click the phone number on mobile and verify the click fires
Check GTM container for any recent changes you didn't make
Review Google Ads conversion diagnostics for any warnings
Compare Google Ads lead count vs actual leads in your inbox/CRM
Check for duplicate conversions (leads recorded twice for the same enquiry)
Verify conversion values are still correct (ecommerce)
Review primary vs secondary settings (make sure nothing changed)
Test tracking after every website update, CMS update or form change
Conversion tracking is not set and forget. Every website update, CMS plugin update or form change is a chance to break it. Check monthly.
What We Recommend at Elev8d
Set up conversion tracking before launching ads. Not after. The first week of data is valuable and you lose it if tracking isn't ready. This is the foundation of the first 30 days process.
Use Google Tag Manager. It's more flexible, easier to test and saves you from needing a developer every time something changes. Install the Conversion Linker tag on all pages. It takes 30 seconds.
Track forms AND calls. Service businesses that only track forms are underreporting conversions by a third or more. The hidden costs guide covers call tracking as one of the costs that actually decides whether Google Ads succeeds.
And test everything. Submit your own form. Call your own number. Check GTM Preview mode. Check Google Ads diagnostics 48 hours later. If the numbers don't match reality, fix tracking before spending another dollar on ads.
FAQs
What is Google Ads conversion tracking?
It connects ad clicks to actions on your website (form submissions, phone calls, purchases, bookings). Without it, you know you're getting clicks but not whether those clicks are producing leads or customers.
Do I need Google Tag Manager for Google Ads tracking?
Not strictly, but it's strongly recommended. GTM makes tracking easier to set up, test, update and maintain without editing your website code each time. For anything beyond the simplest single conversion setup, GTM is the better option.
What conversions should I track?
Every action that represents a genuine business outcome: form submissions, phone calls (with duration), bookings, purchases. Track soft actions (page views, clicks, downloads) as secondary conversions only. Don't let them drive bidding.
How do I track form submissions in Google Ads?
Three main options: fire the conversion tag on a thank you page URL (simplest), use a GTM form submission trigger (works without redirect) or use a custom dataLayer event pushed by your developer (cleanest and most reliable).
How do I track phone calls from Google Ads?
For calls directly from ads, use Google forwarding numbers with call assets. For calls from your website after an ad click, use website call tracking. For simple mobile tracking, use a tel: click trigger in GTM (but remember a click is not always a completed call).
What is the Conversion Linker tag?
It stores ad click information in first party cookies so conversions can be properly attributed to the click. Install it on all pages via GTM. It takes 30 seconds and improves attribution accuracy.
Why are my Google Ads conversions not showing?
Common causes: tracking tag not published in GTM, tag firing on the wrong trigger, Conversion ID or Label entered incorrectly, Conversion Linker tag missing, conversion marked as secondary instead of primary or simply the 24-48 hour reporting delay in Google Ads.
Should phone clicks count as conversions?
As secondary conversions, sometimes. As primary conversions, usually not. A phone click doesn't mean a call was completed. Use actual call tracking with duration thresholds for primary conversion measurement.
How do I know if tracking is working?
Use GTM Preview mode to confirm tags fire on the right actions. Submit a test form and call the tracking number yourself. Check Google Ads conversion diagnostics 24-48 hours later. Compare Google Ads conversion counts against actual leads in your inbox or CRM.
Next Steps: Pick Your Path
Path 1: Set It Up Yourself
Follow this guide step by step. Use GTM. Test in Preview mode. Verify in Google Ads diagnostics. Check monthly.
Path 2: Get a Tracking Audit
Not sure if your current tracking is accurate? Send us your conversion actions, GTM setup and lead flow. We'll show you what's missing, duplicated or misleading. Request a free tracking audit.
Path 3: Have It Built Properly
If you'd rather have tracking set up correctly as part of a managed Google Ads campaign, talk to our team. We build the tracking, manage the campaigns and report on actual leads, not dashboard theatre.
Sources and Further Reading
Elev8d: How Much Do Google Ads Cost in Melbourne? - Including the What You Must Track and Hidden Costs sections
Elev8d: Google Ads Hidden Costs - Why tracking is one of the costs that decides success
Elev8d: Google Ads First 30 Days - Week by week plan starting with tracking verification
Elev8d: Google Ads Landing Pages - Why the page matters as much as the tracking
Elev8d: What's a Good Cost Per Lead? - CPL benchmarks that only work with accurate tracking
Elev8d: Is Google Ads Worth It? - ROI framework that depends on real conversion data
Elev8d: Google Ads Budget Calculator - Model what your budget produces
Google Ads Help: About Conversion Tracking - Google's overview of conversion measurement
Google Ads Help: Set Up Conversion Tracking via GTM - GTM setup guide for Google Ads conversions
Google Ads Help: About Phone Call Conversions - Call tracking options and forwarding numbers
Google Ads Help: About Enhanced Conversions - How enhanced conversions improve measurement
OAIC: Australian Privacy Principles - Privacy obligations for data collection and tracking
Australian Cyber Security Centre - Website security basics for small businesses
General information only. Rules vary by situation, particularly around advertising claims, privacy, reviews and consumer law. If you're unsure about compliance, get professional advice.
