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Estimate your search impression share, lost IS to budget, lost IS to rank, and the missed traffic opportunity hidden in your campaign.
Impression Share is the share of auctions you actually showed in versus the total auctions you were eligible for. Lost IS is then split between budget constraints and Ad Rank limitations so you can pinpoint the right lever to pull.
Impression Share = (Impressions / Eligible Impressions) x 100Lost IS to Budget = applied when daily spend / daily budget >= 95%Lost IS to Rank = (1 - IS - Lost IS Budget) x 100Missed Clicks = (Eligible - Impressions) x 2% CTREstimate Quality Score and its impact on Ad Rank
Plan the right daily and monthly budget for your campaigns
Calculate cost per click for any paid ad campaign
Measure click-through rate across ads, search, and email
Impression Share is one of the most important metrics in Google Ads because it tells you how much of the available search demand your ads are actually capturing. Even a high-performing campaign can be leaving significant revenue on the table if its impression share is low. Our free Google Ads Impression Share Calculator helps you quantify exactly how much traffic you are missing, why you are missing it, and what it would take to capture it. Enter your impressions, eligible impressions, daily budget, and average ad rank to see your search IS, lost IS to budget, lost IS to rank, and a clear estimate of the missed clicks and budget required to close the gap.
Impression Share, often abbreviated as IS, is the percentage of impressions your ads received divided by the total number of impressions they were eligible to receive. If there were one thousand searches that triggered your ad eligibility and your ad showed for six hundred of them, your impression share is sixty percent. The remaining forty percent represents lost opportunities, and Google Ads breaks these losses down into two diagnostic categories: lost IS to budget and lost IS to rank. Tracking impression share over time helps you understand whether your account is scaling efficiently or whether competitors are eroding your share of voice in the auction.
Lost Impression Share to Budget happens when your campaign runs out of money before the day ends. If you spend your entire daily budget by 2 PM, you cannot show ads for the rest of the day, no matter how relevant they are. Lost Impression Share to Rank, on the other hand, happens when your Ad Rank is too low to win the auction. Ad Rank is determined by your bid, your Quality Score, the expected impact of ad extensions, and the auction-time context. Lost IS to budget is a relatively easy problem to fix because you can simply increase the daily budget. Lost IS to rank is harder because it requires improving Quality Score through better landing pages, more relevant ad copy, higher click-through rates, or raising bids on competitive keywords.
The right strategy depends on which type of loss is dominant in your account. If most of your loss is to budget, the path forward is to either increase the daily budget, shift spend from low-performing campaigns into the underfunded one, or use a more efficient bidding strategy like Maximize Clicks with a target CPC. If most of your loss is to rank, focus on Quality Score: rewrite ads to match search intent, tighten keyword groupings into single-themed ad groups, improve landing page experience and speed, add negative keywords to prevent irrelevant matches, and test ad extensions that earn higher click-through rates. For brand campaigns, aim for ninety percent or higher impression share. For non-brand and competitor campaigns, sixty to seventy percent is a healthier and more sustainable target.
Impression share benchmarks vary considerably by industry due to differences in competition density, average CPCs, and search volume. E-commerce and education campaigns tend to operate around sixty to sixty-five percent IS due to broad competitor overlap and price-driven searchers. B2B campaigns often see lower impression share, around forty-five percent, because narrow targeting and high CPCs limit total reach. Healthcare and travel typically land near fifty percent due to seasonality and regional variability. Finance and tech campaigns commonly hit fifty-five percent because of intense bidding competition. Use these benchmarks as directional guides, not hard rules, and always weigh impression share against efficiency metrics like CPA, ROAS, and conversion rate before chasing higher numbers.