A conversion in Google Ads is an action you decide is valuable to your business, such as a purchase, a sign-up or a phone call, which Google counts after someone interacts with your ad. Without tracking, your account shows clicks and spend but not which campaign brought in an actual customer.
What is a conversion in Google Ads?
It is the result you want, defined by you. Google’s help center says a conversion is a customer action you define as valuable. The platform only measures what you set up. If nothing is configured, a campaign can collect clicks and show zero results even while it is selling.
So the first step is choosing which customer action pays your bills, before you touch the ad. For an online store, that is a completed purchase. For a local service business, it is usually a phone call or a submitted quote form.
Five conversion types
The official page lists five:
- Website: actions on your site after someone interacts with your ad, such as purchases or sign-ups. You can measure them with a Google tag, Google Analytics, or both.
- App: installs and in-app actions on Android or iOS.
- Phone call: calls from your ads, calls to a number on your website, and taps on a number on your mobile site.
- Offline: sales in a physical store or other offline activity, recorded by uploading files or through an API. Processing takes 24 to 48 hours, and Google Click IDs (GCLIDs) must be within 90 days.
- Import from Google Analytics: only events marked as key events in Analytics can be imported. You need Admin access in Google Ads and Edit access to the linked Analytics property.
For most small sellers, the website type is enough. If you close sales by phone, look at call and offline tracking.
Setup in three steps
According to Google, it works like this:
- Choose your data sources: Google Analytics, the Google tag, or both.
- Create conversion actions and set each one as primary or secondary.
- Finish the setup. For most website conversions, a tag records a cookie when someone clicks your ad. When that person completes the action you defined, the conversion is recorded. Call forwarding numbers and Google Play app downloads don’t need a tag.
New tags often show “Unverified” or “Inactive” until the first conversion or a successful test event, which is normal.
Primary and secondary actions
A primary action is biddable: Google uses it to decide how much to bid. A secondary action is observation-only. Google notes that incorrect settings can keep Smart Bidding from optimizing well.
In our view, the most common mistake is marking everything as primary, including small steps like “viewed the contact page.” The system then learns to chase cheap actions instead of buyers. Keep the primary label for the action that stands for money or a qualified lead, and use secondary for steps along the way.
From cost per conversion to ROAS: a worked example
Tracking shows which keywords, ads, ad groups and campaigns drive valuable actions. It helps you understand return on investment and it enables Smart Bidding strategies such as Maximize Conversions, target CPA and target ROAS. Those need a 7 to 14 day learning phase, so avoid frequent manual changes while they learn.
Here is an example of ours, with made-up numbers. A store spends US$300 on a campaign and records 12 purchases. Cost per conversion is US$300 ÷ 12 = US$25. If those 12 purchases added up to US$1,800 in sales, return on ad spend (ROAS) is 1,800 ÷ 300 = 6, or US$6 of sales for every US$1 spent. But if your profit per sale does not cover the US$25 plus product cost, shipping and fees, a ROAS of 6 can mislead you. Our guide on what ROAS is shows how to find your break-even number.
Also remember that the main “Conversions” column leaves out view-through conversions, where someone saw your ad but did not click. The “All conversions” column reports results across devices and browsers.
What does it cost, and how long does it take?
Tracking itself is free. You pay for clicks, controlled by your budget. Setting a daily budget is covered in how much to spend on ads.
Time depends on your site. Adding a purchase tag on a store platform with built-in integration can take under an hour. A custom-built site may need help from whoever maintains it.
Mistakes that waste ad spend
- Watching clicks only and assuming the campaign works.
- Setting every action as primary.
- Changing budget and targets daily while Smart Bidding is still learning.
- Skipping the tag test and finding out weeks later that nothing was recorded.
- Comparing cost per conversion with the product price instead of with profit.
When there is nothing to measure yet
If you have no website, form, phone line or store to receive the customer, there is nothing to measure yet. Set up the contact channel first. Tracking also won’t bring sales on its own: it only shows you what is already happening.
Frequently asked questions
Do I have to pay to track conversions?
No. Conversion tracking is part of Google Ads. You pay for clicks, not for the measurement.
Can I track phone calls without installing a tag?
In some cases, yes. Google says call forwarding numbers and Google Play app downloads don’t need a tag.
What is a view-through conversion?
It happens when someone sees your ad but does not click. It is reported separately and left out of the main Conversions column.
How long does Smart Bidding take to learn?
Google points to 7 to 14 days. Avoid frequent changes to budget and targets during that time.
