--- title: Impression Share — definition and how to read it | Siite description: "Impression share explained: how to tell whether budget or relevance is capping your ads, and what the lost-to-rank number is really saying." url: "https://siite.co/dictionary/impression-share" type: static generatedAt: "2026-10-22T08:21:10.785Z" --- Paid Media # Impression Share The share of available ad impressions you actually received — reported with the reasons you missed the rest, split into budget and ad rank. Also goes by IS, Lost IS [![Siite](/images/layout/logo.svg)Written by Siite](/about/)Updated September 8, 2026 ## Entry contents [All Terms A to Z←Browse the full dictionary](/dictionary/) Impression share compares what you actually got with what was available to you. Google reports it with two reasons for whatever you missed: share lost to budget, and share lost to rank. Together they answer a question most advertisers otherwise guess at — whether spending more would actually change anything. > **Briefly explained** > > - How much of the available demand you actually captured. > - Lost to budget: the money stopped before the demand did. > - Lost to rank: you turned up to the auction and came second. > - 100% is almost never the right target. ## How do the two loss columns differ? They point at completely different fixes. - **Lost to budget:** You were eligible and would have won, but the day’s money was already gone. The constraint is money. - **Lost to rank:** You entered the auction and were beaten. Bid and relevance were not enough. The constraint is the account. Raising the budget fixes the first and barely touches the second. It is the most common mistake made with this report. ## How should you act on it? In this order, which keeps you from buying more of something unprofitable. 1. Check profitability per campaign first, using cost per booked job rather than cost per click. 1. On profitable campaigns losing to budget, raise it in steps and re-check after a week. 1. On campaigns losing to rank, look at [Quality Score](/dictionary/quality-score/) components and the landing page before touching bids. 1. On campaigns that are not profitable, do nothing to the budget at all. ## Why is 100% the wrong goal? Because impressions are not equally valuable. The share you are missing is usually the loosest end of the matching: the searches where you were a weak fit, at the hours when buyers are scarce, in the places you half cover. Buying it raises average cost and lowers average quality at the same time. A campaign at 55% share on the right searches beats one at 90% on everything. ## What moves it that has nothing to do with you? Seasons and competitors. A share that falls in a busy month usually means the auction filled up, not that something broke. The useful comparison is the same month last year, which is also the point of [year over year](/dictionary/year-over-year/). ## What do the terms mean? - **Impression share:** What you got, set against what was there to get. - **Lost to budget:** What went elsewhere once the daily budget was gone. - **Lost to rank:** What you gave up by being outranked. - **Top impression share:** The equivalent figure for the positions at the top of the page. - **Eligible impressions:** Google’s estimate of how often you could have shown, given your targeting. Owner questions ## What owners ask us about Impression Share ### What does lost impression share to budget mean? +Your ads stopped showing because the daily budget ran out. If those clicks were profitable, the number is a direct measure of missed work. ### What does lost impression share to rank mean? +You were eligible but not competitive enough. Bid, expected click-through rate, ad relevance or landing page experience held you back. ### Should I aim for 100%? +Rarely. The last slice of impressions is usually the most expensive and the least qualified, so chasing it tends to raise cost per booked job while adding very little volume. ### My impression share fell but nothing changed. Why? +It is relative to everyone else in the auction. A new competitor, a seasonal rush or a rival raising budgets moves your share while your account sits still. ### Is a low impression share always bad? +No. On a broad keyword you only half want, a low share is the system doing what you asked. Read it per campaign, next to cost per booked job.Put this to work ## Guides that use this Step-by-step playbooks from the team, written for owners doing the work themselves. No sign-up and no email required. [### Texas HVAC summer ad-spend curve: why doubling July loses money Most Austin HVAC operators double their Google Ads budget in July. CPCs rise faster than demand and ROAS collapses. Here's the curve we run instead. Read the guide→](/articles/texas-hvac-summer-ad-spend-curve/)4.9191 reviewsWhere this turns into work ## Knowing when more budget helps We read impression share per campaign against cost per booked job, so a budget increase goes where it buys work and not where it buys the same shortfall more expensively. [See the service→](/services/google-ads/)[Ask us about it](/contact/) ![Mikkel Friis, Marketing Manager at Siite](/images/team/panel/mikkel-friis.webp) *Our marketing manager* ## Related entries - [### Google Ads Google's advertising platform, where businesses bid to appear on search results, Maps, YouTube and partner sites — most often paying per click.](/dictionary/google-ads/) - [### Quality Score Google Ads' 1-10 diagnostic estimating how relevant your keyword, ad and landing page are to a searcher — better relevance generally means a lower cost per click.](/dictionary/quality-score/) - [### Pay-Per-Click The advertising model where you pay each time someone clicks your ad rather than when it is shown — the billing basis behind most search advertising.](/dictionary/pay-per-click/) - [### Negative Keyword A term you exclude from a Google Ads campaign so your ads never show for it — the main tool for stopping spend on searches that cannot become jobs.](/dictionary/negative-keyword/) [All terms A to Z Browse every term A to Z Open the dictionary→](/dictionary/)