Starting on June 2nd, 2026, the Google Ads API will transition reach metrics to a "Total Co-view" definition. This update aligns Google Ads reporting with offline media and third-party measurement standards, ensuring consistency across all reporting surfaces, including the Google Ads UI and Editor.
The updated definition of the video view metrics will include all individuals who viewed the ad on connected TV devices, including cases where multiple people are watching YouTube together on the same TV screen.
This change impacts the following reach metrics at the campaign level:
metrics.unique_users
metrics.average_impression_frequency_per_user
metrics.unique_users_two_plus
metrics.unique_users_three_plus
metrics.unique_users_four_plus
metrics.unique_users_five_plus
metrics.unique_users_ten_plus
Required actions
No API version migration or code changes are required to see this new behavior, as it is a data definition change that will be applied automatically.
However, developers and advertisers should be prepared for a potential change in reported reach and frequency values for dates beginning with the launch date. We recommend updating internal documentation or dashboards to reflect this shift in measurement methodology.
If you have any questions or concerns regarding this update, please reach out via the
“Google Advertising and Measurement Community” Discord server .
Mattia Tommasone
Google’s Advertising and Measurement Developer Relations team
