ExternalPlatformApprovedInternal
Impression Share (Google Ads)
The percentage of impressions received compared with the estimated total number of impressions the ad was eligible to receive.
This is Google Ads’s own definition of “Impression Share (Google Ads)”. It is not an approved internal Northwind definition.
Platform formula
Impressions / estimated eligible impressions
Specification
- Platform
- Google Ads
- Source version
- current
- Last verified
- Aug 4, 2026
Behavior
Includes
- Delivered impressions
- Estimated eligible impressions
Excludes
—Known limitations
- Eligibility is estimated using targeting, approval, quality, and other auction factors.
Sources
- Google Ads HelpVerified 2026-08-04