Definition
Impression Share is a metric in Google Ads that shows the percentage of impressions your ads received compared to the total number of impressions they were eligible to receive. It indicates how often your ads are shown when they could have been shown.
How It Works
- Impression Share = Impressions received ÷ Impressions eligible
- Eligibility is determined by factors such as:
- Your bids or bidding strategy
- Budget
- Ad quality and Ad Rank
- Targeting settings
If your campaign has an Impression Share of 60%, it means your ads were shown in about 60% of the auctions where they were eligible.
Why It’s Important
Impression Share helps advertisers:
- Understand missed opportunities in the auction
- Identify whether campaigns are limited by budget or Ad Rank
- Measure visibility and competitiveness in search results or other placements
This metric is often analyzed together with:
- Search Lost IS (Budget)
- Search Lost IS (Rank)
These metrics explain why impressions were missed.
How to Optimize
- Increase budget if Impression Share is limited by budget.
- Improve ad quality and relevance to increase Ad Rank.
- Adjust bids for important keywords or audiences.
- Refine targeting to focus on high-value traffic and improve efficiency.
Monitoring Impression Share helps advertisers understand how visible their ads are and where improvements can increase reach and performance.