
Learn more about reporting on impression share in Search Ads 360. In either case, a value of 20% indicates that in 20% of customer searches that matched your keywords, your ad didn't appear because your budget is too low. Or you may miss opportunities for impressions evenly throughout the day. This metric is calculated by taking the number of impressions your ad received divided by the total number of impressions your ad was eligible to receive. Depending on the budget delivery method you've set for a campaign, your ads may appear in the morning, but then your daily budget runs out and prevents you from bidding in the afternoon. Impression share shows you how the performance of your ad compares with the performance of others’ ads. Search lost IS (budget): This is the percentage of time your ad didn't appear because your budget is too low.For example, if you see 20% for this metric, then in 20% of customer searches that matched your keywords, your ad didn't appear because of ad rank.
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Learn more about ad rank and how to improve it. Search lost IS (rank): This is the percentage of time your ad didn't appear because of poor ad rank, which is determined by your bid relative to your competitors and by your ad quality.To understand what's driving a low impression share, view the following metrics: You can set the Target impression share to 100 and the system will then try to show your ad on 100 of auctions in that campaign. For example, let’s say you want your ad to show 100 of the time when a user searches for your brand. A low impression share on the Search Network means your keywords are matching customer searches, but your ads aren't appearing due to other issues. Target impression share can be useful for campaigns with brand terms.

Impression share (IS) is the number of impressions you've received divided by the estimated number of impressions you were eligible to receive.
