Impression Share

Impression share is the percentage of total available impressions your ads actually received in a given market. It is calculated by dividing the number of impressions your ad received by the estimated number of impressions it was eligible for. Google Ads breaks lost impression share into two categories: lost due to budget, meaning your daily budget ran out before all eligible auctions occurred, and lost due to rank, meaning your Ad Rank was not competitive enough to win the placement. Why it matters: impression share is the clearest indicator of how much untapped opportunity exists within your current targeting. If you are only capturing 40 percent of available impressions for your most profitable keywords, 60 percent of potential customers are seeing a competitor's ad instead of yours. For branded keywords, most advertisers target 90 percent or higher impression share to ensure they dominate searches for their own company name. For competitive non-branded terms, 50 to 70 percent is often a realistic and profitable target. The distinction between budget-lost and rank-lost impression share guides your optimization strategy. Budget-lost share suggests you need to increase daily budgets or narrow targeting to focus spend on higher-value segments. Rank-lost share signals that improving Quality Score, raising bids, or adding ad extensions will be more effective than simply increasing budget. Monitoring impression share trends over time, especially alongside competitor activity reports, helps you detect market shifts early and respond before they erode your pipeline.