Digital marketing term
Impression Share
Impression Share is a metric that shows, as a percentage, how many impressions an ad actually received out of the total impressions it was eligible for.
Detailed explanation
This ratio shows how much of all the search or impression opportunities an advertiser was eligible for were actually captured. Every percentage point below 100% represents impressions missed due to a budget limit, a low bid, or a weak quality score.
This metric is typically split into budget-lost and rank-lost shares; this split shows which area needs optimization.
Marketers use this data to decide whether they need to increase budget or improve ad quality, and to make strategic adjustments during periods of heavy competition.
Frequently asked questions
- Why might impression share be low?
- Insufficient budget or a low Ad Rank can cause some eligible impression opportunities to be missed.
- How is impression share increased?
- Increasing budget or raising quality score to improve Ad Rank both increase impression share.
Related terms
Internal links for the topic cluster — read these concepts together.
- Ad RankAd Rank is the ranking score that determines the position an ad appears in on platforms like Google Ads for a given search, combining bid amount, ad quality, and expected impact.
- Quality ScoreQuality Score is Google Ads' 1–10 rating of a keyword's expected relevance, based on expected CTR, ad relevance, and landing page experience.
- SEMSEM (Search Engine Marketing) is the practice of acquiring visibility and traffic through search engines—typically via paid search, and sometimes including SEO.
- ReachReach is a core visibility metric that counts the number of unique users who saw a piece of content or an ad at least once within a given period.
- TargetingTargeting is the set of criteria — demographic, geographic, behavioral, or contextual — used to decide who sees a given ad or piece of content.