Your campaign report shows impressions, clicks and conversions. It does not show the searches where your ad should have appeared and did not. Impression share fills that gap. It tells you how much of the available demand you actually reach, and the two columns next to it tell you why you miss the rest.
Read impression share as a diagnosis, not a score, and it answers a sharp question: is budget or Ad Rank holding this campaign back, and is the missing demand worth buying? This guide covers the formula, lost impression share to budget and to rank, the top and absolute top variants, where to find each metric and how to improve it. The definitions come from Google Ads Help, and we are honest about when a higher impression share is not worth the money. At Viralistic we do not optimise for visibility as such. We optimise for enquiries, their quality and the cost of a new client.
What is impression share?
Impression share (IS) is the percentage of impressions your ads receive compared with the total number of impressions they could get. That is how Google Ads Help defines impression share. You will see it written as IS in column names and reports.
Impression share = impressions ÷ estimated eligible impressions × 100%
An impression is counted each time your ad is shown. An eligible impression is an auction your ad could have appeared in. Google estimates that number from your targeting settings (keywords, locations, schedules, devices), the approval status of your ads and their quality. You never count eligible impressions yourself. Google Ads does the estimate and shows the result as a percentage.
Two details make the number easier to trust. Google only includes auctions where your ad was reasonably competitive. An auction you would have won at twice your current bid is included. An auction that would need a bid increase of around 1000 percent is not. Search partners are excluded too, so impression share describes Google Search itself.
Shopping and Performance Max follow the same logic with small adjustments. In Shopping, only your first impression per search counts, so several of your product ads in one auction do not inflate the number. In Performance Max, Google combines Search and Shopping impressions.
How to calculate impression share: a worked example
Say a physiotherapy clinic in Rotterdam runs a Search campaign for sports injury treatment. Over a month the campaign gets 9,000 impressions. Google estimates the ads were eligible for 15,000.
Impression share: 9,000 ÷ 15,000 × 100% = 60%
For every ten searches where the ad could have appeared, it appeared six times. The formula also works backwards, which is how you estimate eligible impressions yourself: impressions divided by impression share, so 9,000 ÷ 0.60 = 15,000. The four it missed are the more useful part of the story, because they point to what is holding the campaign back.
Why do you miss impressions: budget or rank?
Impression share tells you how often you showed. Lost impression share tells you why you did not show the rest of the time: either your budget ran out, or your Ad Rank was too low to win. You need both columns before you change anything.
Search lost IS (budget) is the percentage of time your ads did not show on the Search Network because the budget was insufficient. Google reports it at campaign level only, which is where the budget lives. Search lost IS (rank) is the percentage of time your ads did not show because of poor Ad Rank. Rank here means your standing in the auction, not your position on the page. Ad Rank depends on your bid, the quality of your ad and landing page, Ad Rank thresholds, the competition and the context of the search, as we explain in how Google Ads works.
Together, the three numbers describe the estimated pool of eligible impressions: what you won, what budget cost you and what rank cost you. For the clinic that is 60% won, 10% lost to budget and 30% lost to rank. Added up, they land at roughly 100%. They are estimates, so a small gap is normal.
Two campaigns can share the same impression share and still need opposite fixes.
- Campaign A
- Campaign B
| Campaign A | Campaign B | |
|---|---|---|
| Won | 55% | 55% |
| Lost to budget | 35% | 5% |
| Lost to rank | 10% | 40% |
Worked example
Campaign A wins most auctions it enters, then runs out of money before demand runs out. Campaign B has budget to spare and keeps losing auctions. More budget would barely move Campaign B. It needs better ads, a more relevant landing page or a higher bid, in that order.
One caveat on automated bidding. With Maximize conversions or Maximize clicks, the bid strategy itself decides how hard to bid within your budget, so the line between budget and rank blurs. Jyll Saskin Gales, a Google Ads coach who worked at Google for six years, advises treating the split as not meaningful under a Maximize strategy and assuming you lose to both.
What do top, absolute top and exact match share measure?
Beyond standard impression share, Google Ads offers variants that look only at the ads above the organic results, or only at searches that match your keywords exactly. Watch the naming: two of these metrics are rates of your own impressions, not shares of the market.
Google calls the ads next to the top organic results “top ads”, and they usually appear above them. The absolute top is the very first of those ads. These are the metrics you will meet most often in the Competitive metrics column group. They also replaced average position, which Google retired in September 2019, so an older guide that tells you to watch average position describes a column you will no longer find.
| Column in Google Ads | What it measures | Share of the market? |
|---|---|---|
| Search impr. share | Your Search impressions divided by your estimated eligible impressions | Yes |
| Search lost IS (budget) | Eligible impressions missed because of budget, campaign level only | Yes |
| Search lost IS (rank) | Eligible impressions missed because of Ad Rank | Yes |
| Search top IS | Your impressions among top ads divided by the top ad impressions you were eligible for | Yes |
| Search abs. top IS | The same, for the very first ad position only | Yes |
| Search exact match IS | Impression share for searches that exactly match your keywords or their close variants | Yes |
| Impr. (Top) % | The percentage of your own impressions that appeared among top ads | No |
| Impr. (Abs. Top) % | The percentage of your own impressions that appeared as the very first ad | No |
The last two describe placement, not reach. An Impr. (Top) % of 80% means 80% of your impressions showed at the top. It does not mean you showed at the top for 80% of relevant searches. In its guide to top and absolute top metrics, Google advises against using these two as bid targets: they can fall as bids rise, because higher bids let you into more competitive auctions where you land lower. If you want to bid for placement, use Search top IS or Search abs. top IS instead.
Search exact match IS is most useful when you run broad match. It shows whether your losses sit in the searches closest to your offer, or in the wider variations Google adds. Display campaigns have their own Display impr. share. The Google Ads API also reports a search click share: the clicks you received divided by the clicks you were estimated to be eligible for. Where impression share asks whether you showed, click share asks whether you were chosen.
What is a good impression share?
There is no universal good impression share, and Google does not publish a benchmark for one. The right level depends on the type of search, your margin and what an extra impression is worth to you. A high share is only good if the customers it brings are worth what it costs.
You will still see numbers quoted, in AI answers and agency glossaries alike: 90 to 95% on brand or niche terms, around 60% on competitive keywords, anything under 50% called bad. Those are agency rules of thumb, not Google figures, and they ignore your margin entirely. Use them as a conversation starter, never as a target.
For searches on your own brand name, you usually want to show nearly every time. Google uses that very example: a Target impression share of 100% on a brand campaign, so your ad appears whenever someone searches for you. Whether you need a brand campaign at all depends partly on whether competitors bid on your name, which auction insights will show you.
On broad, generic keywords, a lower share is often the healthier choice. The last percentage points are the most expensive, and the extra impressions tend to come from searches further from what you sell. A consultancy that fills its calendar with good enquiries at 40% impression share has no reason to pay for 90%.
Impression share is also always relative to the size of the pie. Widen your targeting and the number of eligible impressions grows, so your share falls even if you reach exactly as many people. Google makes the same point: narrowing your regional targets can raise impression share, but it also shrinks the impressions available to you.
| Impression share | |
|---|---|
| One city | 80% |
| Region | 27% |
| Whole country | 10% |
Worked example: 4,000 impressions against 5,000, 15,000 and 40,000 eligible impressions
Mind the edges of the scale. Below 10%, Google stops reporting an exact figure: the interface shows ”< 10%” and the Google Ads API reports the value as 0.0999. Lost impression share works the other way round, with anything above 90% reported as 0.9001. A dash means there is not enough data yet, often because of low traffic or new keywords, or the data is still processing. Google notes that small fluctuations over time do not necessarily call for action.
Where to find impression share in Google Ads
Impression share lives in the Competitive metrics columns, at campaign, ad group and keyword level. Google does not add these columns by default, so you add them once:
- In your Google Ads account, open Campaigns, Ad groups or Search keywords.
- Select the columns icon above the table.
- Open Competitive metrics and tick Search impr. share, Search lost IS (budget) and Search lost IS (rank).
- Select Apply, then save the column set so you can reuse it.
A few rules from Google’s guide to impression share data help you read the numbers. All impression share metrics update within one to two days, so do not judge yesterday today. They are reported separately for each campaign type and are not aggregated across the account. Lost IS (budget) appears at campaign level only. Lost IS (rank) will not show on the Ad groups tab if the budget ran out at any point in the date range you are looking at.
You will not find impression share in your other tools. Google Analytics 4 measures what visitors do on your site, not how often you entered an auction. Search Console reports organic impressions, but no share. Meta Ads Manager has no keyword auction to share in, so there you look at reach and frequency instead. Microsoft Advertising does offer comparable metrics in its Share of voice report, and Amazon Ads reports a top-of-search impression share for Sponsored Products and Sponsored Brands campaigns.
Auction insights: your share next to your competitors
The auction insights report compares your performance with other advertisers in the same auctions. It is available for Search, Shopping and Performance Max campaigns. Select a campaign, ad group or keyword and choose Auction insights. For Search you get impression share, overlap rate (how often a competitor showed when you did), outranking share (how often you ranked above them, or showed when they did not), position above rate, top of page rate and absolute top of the page rate.
According to Google’s auction insights guide, the report shows no insights when your impression share is below 10%. A competitor’s impression share in your report is measured against the auctions they were eligible for, so it can differ from what they see in their own account. The report is best at explaining change. If your impression share drops while you changed nothing, check whether a new advertiser with a high overlap rate has entered your auctions.
How to increase impression share, and when not to
You increase impression share by fixing the cause of the loss: budget when you lose to budget, quality and then bids when you lose to rank. Do it only where extra impressions bring extra good enquiries. Google puts it plainly: to raise impression share, your ads must appear more often or in more places. That is a means, not a goal.
This calculator shows how many impressions and clicks you are missing, and whether budget or rank is your bigger constraint. The defaults reproduce the clinic example, with a click-through rate of 6%.
- Estimated eligible impressions
- 15,000
- Lost to rank (approx.)
- 30%
- Impressions missed to budget
- 1,500
- Extra clicks with enough budget
- 90
Rank is your biggest constraint, or you lose very little. More budget will not help much: improve your ads and landing page first, then review your bids.
In the clinic example, budget costs only 1,500 impressions, or about 90 clicks at a 6% CTR. Rank costs three times as much. Raising the budget would change little, so the work starts with ad relevance and the landing page. And if you do recover missed impressions, do not convert them blindly into enquiries. Impressions you are missing now may have a different CTR and conversion rate from the ones you already win. Test a change for a few weeks and compare the cost per enquiry, so you know rather than guess.
| What you see | What it means | First step |
|---|---|---|
| High loss to budget, good CPA | You are leaving profitable enquiries on the table | Raise the budget or move it from weaker campaigns |
| High loss to budget, poor CPA | Your budget is protecting you | Fix search terms, ads and landing page first |
| High loss to rank | You lose auctions to competitors | Improve quality first, then consider higher bids |
| Little loss, still too few enquiries | You show almost every time, but demand is small | Widen targeting, add keywords or build organic visibility first |
When you lose impression share to budget
Google lists the obvious levers: increase the budget, adjust your bid, narrow your regional targets, and readjust the budget whenever you widen targeting. We add one question that comes before all of them. Does this campaign already bring good enquiries at a CPA that fits what a client is worth to you? If yes, lost IS (budget) means profitable clients are slipping away. If no, the budget is stopping you from spending more on something that does not work.
Often the answer is not to spend more but to spend differently. Exclude search terms that never turn into clients, limit the campaign to the regions and hours where your buyers actually search, tighten broad match keywords that wander to phrase or exact match, and move money away from campaigns that perform worse. The same budget then covers the searches that matter.
When you lose impression share to rank
Losing to rank means you do not win the auction often enough. A higher bid is the most expensive fix, so start with quality. Google states that highly relevant keywords and ads can earn a higher position at a lower price, even when competitors bid more. Quality Score shows where the weakness sits: expected click-through rate, ad relevance or landing page experience.
That last component is often not an advertising problem at all. A landing page that loads slowly, does not match the search or tells an unclear story costs you auctions. Then conversion optimisation or a better website comes first, and a higher bid comes later. This is why our marketing approach starts with the foundation. If you do raise bids, check that your CPC and cost per enquiry stay within target.
Target impression share bidding
Target impression share is an automated bid strategy that sets bids so your ad shows a chosen percentage of the time in a chosen place. Google’s Target impression share guide lists three placements: top of page, absolute top of page and anywhere on the page. Choose 65% at the absolute top and Google sets your CPC bids so your ad appears in the first position 65% of the times it could.
You set a maximum CPC bid limit, and Google warns against setting it too low because you will then miss your target. Existing bid adjustments are ignored, apart from a -100% device adjustment. The strategy only covers the Google Search Network, excluding search partners.
Google suggests brand campaigns and local visibility as typical uses. We use it mainly for brand terms. On generic keywords it bids for visibility rather than enquiries, and clicks can become expensive quickly. If you use it there, set a maximum CPC and judge the campaign on cost per enquiry, not on the share it reaches.
How does it connect to CTR, CPC and ROAS?
Impression share sits at the start of the chain. Impressions become clicks (CTR), clicks cost money (CPC), some clicks become enquiries or sales (CPA), and those produce revenue (ROAS). A change at the start ripples through everything after it.
Lost IS (rank) and Quality Score are closely linked, because the quality of your ad and landing page feeds into Ad Rank. Your placement on the page affects CTR, and Google offers the top and absolute top rates to explain CTR changes caused by placement. Win back lost impressions with higher bids and your CPC usually rises with them. Whether that is worth it is a question for your CPA or ROAS, not for impression share.
That is why impression share is rarely a good KPI. It is a diagnostic. It shows where there is room to grow and what is blocking it. Whether you should take that room is decided by the numbers that describe your business: enquiries, their quality and what a new client costs.
Common mistakes when reading the numbers
Most mistakes come from treating impression share as a target instead of a diagnosis. These are the ones we see most often in accounts:
- Chasing 100%. The last few points cost the most and usually come from searches that bring the least.
- Reading impression share without the lost IS columns. Without them you cannot tell whether to fix budget or quality.
- Comparing campaigns with different targeting. A national campaign has a far bigger pie than a city campaign, so a lower share says little.
- Reading Impr. (Top) % as market share. It describes your own impressions, not all relevant searches.
- Raising the budget on a campaign that does not bring good enquiries. You buy more of what already fails.
- Reacting to a dash, to ”< 10%” or to small swings. With little data, the number is too uncertain to steer by.
- Running Target impression share on generic keywords without a maximum CPC. The strategy will do exactly what you asked: show up, whatever the price.
How we help
Viralistic is a strategic digital partner in Amsterdam, founded and led by Marrallisa Kreijkes. Our marketing is organic first. Before a single euro goes to ads, we check the foundation: a clear story, a fast website that turns visitors into enquiries, measurement that works, and visibility in Google and in AI answers. If you lose a lot of impression share to rank, the fix often sits right there, not in a higher bid.
When the foundation is healthy and you still need more clients, we run Google Ads built on your brand script. We test broadly first, review the results with you and then decide together where more budget should go. Impression share is one of our diagnostics along the way: it tells us where demand is going unanswered and why, and the enquiry numbers tell us whether to answer it. We report on enquiries, their quality and the cost of a new client, and we test changes with experiments rather than guessing. A person checks every campaign, also when AI helped. Read more about our marketing approach or about outsourcing Google Ads.
Frequently asked questions
How do you explain impression share?
Impression share is how often your ad showed compared with how often it could have shown. If Google estimates your ad was eligible for 1,000 auctions and it appeared in 600, your impression share is 60%. The remaining 40% was lost either because your budget ran out or because your Ad Rank was too low to win.
What is a good impression share in Google Ads?
There is no universal benchmark, and Google does not publish one. On your own brand name you usually want to show almost every time. On generic keywords a lower share is often smarter, because the last points cost the most. A good impression share is the one that brings enough good enquiries at a cost per enquiry your margin can carry.
What are impressions in Google Ads?
An impression is counted each time your ad is shown on a search results page or another site on the Google Network. Google Ads abbreviates it as “Impr.” in your account. An impression says your ad appeared, not that anyone looked closely or clicked. Impression share then compares those impressions with the ones you were eligible for.
What is the difference between impressions and impression share?
Impressions are a count: how many times your ad was shown. Impression share is a ratio: how many of the possible impressions you won. The same 9,000 impressions can be 60% in a small market and 10% in a large one. That is why impressions alone say little about how much room you still have.
How do you calculate eligible impressions?
Divide your impressions by your impression share. A campaign with 9,000 impressions at a 60% impression share was eligible for roughly 15,000 impressions. Google estimates eligibility itself from your targeting, ad approval and quality, so this is a back-calculation of Google’s estimate, not an independent count. Below 10% the result becomes unreliable.
What does search lost IS (rank) mean?
Search lost IS (rank) is the percentage of time your ads did not show on the Search Network because of poor Ad Rank. Ad Rank depends on your bid, the quality of your ad and landing page, the competition and the context of the search. A high value usually calls for better ads and landing pages before higher bids.
What is the Target impression share bid strategy?
Target impression share is an automated bid strategy in Google Ads. You choose a placement (top of page, absolute top or anywhere) and a percentage, and Google sets your bids to reach it. Google suggests it for brand campaigns and local visibility. Always set a maximum CPC bid limit and judge the result on cost per enquiry.
Why does my impression share show ”< 10%”?
Google does not report an exact figure below 10%. The Google Ads API returns such values as 0.0999, and the auction insights report shows no data at that level. It is common for new campaigns, small budgets or very broad targeting. Look at lost IS (budget) and lost IS (rank) to see which one explains the low share.
Is click share the same as impression share?
No. Impression share compares the impressions you won with the impressions you were eligible for. Click share compares the clicks you received with the clicks you were estimated to be eligible for. Impression share tells you whether you showed up. Click share tells you whether searchers chose you once you did.
Written by
Founder of Viralistic and official n8n Ambassador
Marrallisa leads strategy, design, search and automation for premium brands from Amsterdam. She has trained teams at Volkswagen and speaks at n8n and Anthropic events. Want to talk through your situation? Book a call with her directly.