Starting 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 for consistent metrics across all reporting surfaces, including the Google Ads UI and Editor.
The updated definition will consider all individuals who viewed ads on connected TV devices, including instances where multiple viewers watch the same content on a shared screen. Affected reach metrics at the campaign level include:
- metrics.unique_users
- metrics.averageimpressionfrequencyperuser
- metrics.uniqueuserstwo_plus
- metrics.uniqueusersthree_plus
- metrics.uniqueusersfour_plus
- metrics.uniqueusersfive_plus
- metrics.uniqueusersten_plus
No API version migration or code changes are needed for this behavior change, but developers and advertisers should prepare for potential adjustments in reported reach and frequency values after the launch date.
Read the official announcement here: Standardizing Reach Metrics with Total Co-view in the Google Ads API.