Search Lost IS

Search Lost IS shows the percentage of impressions a search campaign missed, split by budget-constrained or rank-constrained causes.

"Lost IS (budget)" means your daily budget ran out before it could serve all eligible auctions — a straightforward fix if the unit economics support more spend. "Lost IS (rank)" means your ads simply lost auctions to competitors on quality or bid — a fix that requires improving Quality Score, raising bids, or accepting the current ceiling.

This split is one of the fastest diagnostic checks in a Google Ads account. A campaign losing 40% of impressions to budget with a healthy CPA is a scale-it decision; the same 40% lost to rank is a quality-and-competitiveness problem.