What Is Impression Share?
Impression share is the proportion of eligible ad impressions that an advertising campaign receives. The metric compares served impressions with the impressions the campaign could have received under its targeting, bidding, budget and ad-rank conditions. In Google Ads, impression share helps show how often an eligible pay-per-click ad appears in available search opportunities.
Quick Facts About Impression share
Category
Paid search visibility metric
Used for
Assessing missed advertising opportunities
Common confusion
It does not measure clicks or conversions
Also called
Search impression share, Impression share percentage
Often discussed with
Pay-Per-Click Advertising
Key Takeaways About Impression share
- It measures visibility among eligible auctions, not all searches.
- Budget, targeting, bids and ad rank can affect the result.
- Impression share is not the same as click-through rate.
How Impression share Works
Impression share is calculated from impressions that an ad was eligible to receive. Google Ads considers the campaign's targeting settings, available search demand, budget, bid and ad rank. An ad may be eligible for a search but fail to appear when another factor limits its opportunity.
Related glossary terms: Click-through rate, Conversion rate, Search intent.
A lower result can point to different issues, so the metric needs context. Budget-related loss suggests that the campaign could not enter every suitable auction throughout the available demand. Rank-related loss points to competition, bid strength or ad quality. Reviewing these signals beside click-through rate and conversion data gives a clearer view of paid search performance.
Expert Note
When we review Impression share, we segment the result by campaign, location, device and search term themes. We then check whether lost opportunities relate to budget, ad rank or targeting before recommending changes. Our team also compares visibility with clicks and enquiries so the metric supports practical account decisions.
Impression share in Practice: A Real-World Example
A Sydney dental clinic may target searches for emergency dental appointments in selected suburbs. Its Impression share can fall when the campaign reaches its budget limit or when competing ads achieve stronger ad rank, even though the campaign remains eligible.
Related Services
Related Terms
Click-through rate
Click-through rate is a percentage-based measure that shows how often people select an advertisement or search…
Conversion rate
A conversion rate is the proportion of visitors who complete a desired action on a website…
Search intent
Search intent is the purpose behind a person’s query in a search engine. It shows whether…
SERP
A SERP is a search engine results page displayed after someone submits a query. The page…
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