Impression Share is the percentage of eligible impressions an ad received compared with the total impressions it could have received.
Impression Share is the percentage of eligible impressions an ad received compared with the total impressions it could have received. A common calculation is: Impressions received ÷ eligible impressions. In Microsoft Advertising and Bing Ads, this term gives marketers, designers, developers, and business owners a precise way to talk about work that affects visibility, user experience, measurement, and revenue. A strong understanding of Impression Share prevents teams from optimizing isolated tasks without knowing what business result they are supposed to support. The concept should always be applied with context: who the audience is, what problem they have, what action matters, how success will be measured, and how the work connects to the broader customer journey.
Example of Impression Share
In a Microsoft Advertising account, impression share might be used to reach searchers on Bing and Microsoft partner properties while tracking leads with UET. For example, a B2B service provider could layer audience targeting, location targeting, and conversion goals to improve lead quality.
Why Impression Share matters
It matters because Microsoft Advertising can reach valuable search and professional audiences that are often overlooked. Clear measurement and audience structure help the channel complement Google Ads rather than simply duplicate it.
Related terms
quality score, maximize conversions, auction insights, target ROAS, Google Import, target CPA
Frequently Asked Question
What does Impression Share mean?
Impression Share means the percentage of eligible impressions an ad received compared with the total impressions it could have received. It matters in Microsoft Advertising and Bing Ads because it helps teams make clearer decisions, measure the right outcomes, and connect marketing work to business goals.