Google Ads conversion tracking: Measuring inquiries, purchases and revenue

Conversion tracking is the foundation of every Google Ads account. Without reliable data, Smart Bidding optimizes for the wrong signals, budget flows into campaigns that sell nothing, and no one can say what your advertising contributes to profit.

That's why our rule is simple: measure first, then advertise. This guide explains how conversion tracking in Google Ads works today, what changed in 2026 and which settings make the biggest difference.

Conversion tracking turns ad spend into an investment

Conversion tracking shows you which campaigns, ads and search terms deliver results. You pause what doesn't work and shift budget to what pays off. Decisions rest on data, not assumptions.

The conversions you report and their values tell Google which results your bidding strategy should aim for. What you count as success determines what Google spends your budget on.

A conversion is any action that creates value for your business

A conversion is a user action that is valuable to your business. It is recorded via tags, small snippets of code on your website, or via data you send from your CRM to Google.

We distinguish between two levels:

• Macro conversions are the actual business goals: purchases, qualified inquiries, signed contracts.
• Micro conversions are intermediate steps: newsletter sign-ups, downloads, visits to the contact page.

Measuring both shows where prospects drop off. But only actions that genuinely represent revenue and profit should count as primary conversions, the signals that drive bidding. Micro conversions are tracked as secondary actions.

Google Ads tracks conversions online, by phone and offline

Website conversions

The most common type: purchases, contact inquiries, clicks on key buttons or sign-ups. Tracking is usually implemented with Google Tag Manager.

Call conversions

For many service businesses, this is the most important contact channel. Google Ads tracks calls made directly from the ad as well as calls from the website. A Google forwarding number replaces your phone number on the page, so every call can be attributed to the ad that triggered it.

App conversions

With Google Analytics 4 or Firebase, you track not just installs but in-app actions such as purchases. That way, bidding optimizes for users who actually use the app.

Offline conversions

Many deals close not online but by phone, through sales or in store. You feed these results back from your CRM into Google Ads. Google now recommends enhanced conversions for leads for this, which is fastest to set up via Data Manager. Include the GCLID, Google's click ID, wherever it is available.

How to set up conversion tracking properly

1. Define your goals: What exactly counts as a conversion for your business, and which conversions should drive bidding?
2. Choose a method: For most websites we recommend Google Tag Manager.
3. Create the conversion action in Google Ads: Set the category, value and counting method. For inquiries, “one” conversion per click is usually right; for purchases, “every”.
4. Check the attribution model: The default is data-driven.
5. Implement the tags: Fire the conversion linker and conversion tag in Tag Manager, and handle consent via Consent Mode.
6. Test: Use Tag Assistant to confirm that every conversion is recorded exactly once and with the correct value.

Data-driven attribution is the default

Google Ads now offers only two attribution models: data-driven and last click. Google has retired the rule-based models (first click, linear, time decay and position-based) and moved existing actions to data-driven.

The data-driven model uses your account's data to assess how much each touchpoint contributed to a conversion, for example a YouTube video three days ago and a search click today. That way, campaigns early in the buying journey get their share of credit too.

Conversion values determine what Google optimizes for

Measure not just whether a conversion happens, but what it's worth:

• Online stores pass the cart value dynamically.
• Inquiries get fixed values based on the type and quality of the inquiry.

Bidding strategies such as target ROAS only work with values. We go one step further: revenue without margin isn't success. Wherever possible, we pass values that reflect contribution margin rather than gross revenue. Google then steers toward the products and services you actually make money on.

With customer lifecycle goals, you can also value new customers more highly than existing ones, or bid for new customers only. How much more is determined by customer lifetime value, not a rule of thumb.

Enhanced conversions close the gaps cookies leave behind

When cookies are blocked or deleted, Google loses the link between the ad click and the conversion. Enhanced conversions restore it:

1. A user makes a purchase or submits an inquiry and provides, for example, their email address.
2. The address is made unreadable (hashed) with SHA-256 and sent to Google.
3. Google matches the hash against signed-in Google accounts and attributes the conversion to the original click.

Since April 2026, enhanced conversions for web and for leads have been combined into a single setting. Google Ads accepts user-provided data from the website tag, Data Manager and the API at the same time. Existing setups were migrated automatically.

Google has quantified the effect: advertisers who adopted enhanced conversions early saw a median 5% higher conversion rate in Search and a 17% higher rate on YouTube.

A note for developers: Google is consolidating uploads of offline conversions and enhanced conversions for leads in the Data Manager API. New setups should be built there from the start.

Consent Mode v2 is mandatory in the EEA

For users in the European Economic Area, Consent Mode v2 passes the consent status to Google, including via the ad_user_data and ad_personalization parameters. Without it, you lose data for measurement, remarketing and Customer Match.

Google offers two variants:

To model missing conversions, Google needs a minimum number of ad clicks per country and domain. Which variant is right for you is a decision to make with your data protection officer. We involve them from day one.

Google tag gateway and server-side tagging make data more reliable

Google tag gateway

With Google tag gateway, the Google tag runs through your own domain instead of Google's servers, so ad blockers and browser restrictions interfere less often. The feature is available to everyone and can be set up through common providers such as Cloudflare or Google Cloud. Google reports an average of 14% more measured conversions.

Server-side tagging

With server-side tagging, your own server sends the data to Google instead of the browser. You control which data is shared, the website loads faster and data quality improves. The most robust setup combines tag gateway with server-side tagging.

Google Analytics 4

Link Google Ads with GA4. For bidding, we prefer native Google Ads tracking, but GA4 adds valuable data on user behavior before and after the click.

Traffic from AI search belongs in your measurement too

More and more buying decisions start with a question to ChatGPT, Perplexity or Google's AI Mode. In Google Analytics, clicks from AI Overviews and AI Mode count as organic search. Visits from chatgpt.com or perplexity.ai can be analyzed as a separate group. Our article on Generative Engine Optimization explains how to increase and measure your visibility in AI answers.

Conclusion: good data is the foundation for profit

A basic pixel is no longer enough. Enhanced conversions, Consent Mode v2, Google tag gateway and server-side tagging now determine whether your campaigns run on complete data.

Ultimately, what matters is what you measure. Report only revenue, and you get revenue. Report values that reflect profit contribution, and Google optimizes for profit. No algorithm can make that decision for you.