Percentage of Search impressions lost because your Ad Rank was too low to show ads in auctions (due to low bids or poor Quality Score).
What is Search Lost IS (Rank)? Lost IS (Rank): % of impressions lost due to poor Ad Rank (low bids or Quality Score). Part of: IS + Lost IS (Budget) + Lost IS (Rank) = 100%. >20% signals competitiveness problem. Fix: improve Quality Score first (free), then raise bids 20-30%. Can't fix with budget alone—need better Ad Rank (bid × QS).
Search Lost IS (Rank) measures the percentage of Search Network impressions your ads didn't receive due to poor Ad Rank—the combination of your bid and Quality Score wasn't competitive enough to win auctions. Even with unlimited budget, low Ad Rank prevents ads from showing. Formula: Search IS + Lost IS (Budget) + Lost IS (Rank) = 100%. If campaign has 55% IS, 10% Lost IS (Budget), and 35% Lost IS (Rank), you're missing 35% of eligible impressions purely because your Ad Rank (bid × Quality Score) is too low to compete. High Lost IS (Rank) (>20%) signals need to either increase bids, improve Quality Score (better ad relevance, landing page experience, expected CTR), or both. Available at campaign, ad group, and keyword levels. Updated within 1-2 days.
Official Source: Definition verified from Google Ads Help Center (Last verified: January 2026)
"Search lost IS (rank) is an estimate of how often your ad didn't show on the Search Network due to poor Ad Rank."
B2B SaaS company runs Search campaign targeting "project management software." Search IS 48%, Lost IS (Budget) 6%, Lost IS (Rank) 46%. Current CPA $180 (target $200). Wants to increase coverage.
Current State: - IS: 48%, Lost IS (Budget): 6%, Lost IS (Rank): 46% - Quality Score: 6/10 (Average Expected CTR, Average Ad Relevance, Below Avg Landing Page) - Max CPC: $8.50 - Avg CPC: $7.20 - CPA: $180 (profitable) Diagnosis: 46% Lost IS (Rank) is primary issue (Budget is fine at 6%). Low Ad Rank due to: 1. Quality Score 6/10 (below optimal 7-8/10) 2. Max CPC $8.50 (likely below market for competitive keyword) Fix Strategy: Phase 1 - Improve Quality Score: - Landing Page: Created dedicated landing page for "project management software" (was sending to homepage) - Ad Copy: Added keyword to headlines, stronger CTAs - Expected result: QS 6/10 → 7/10 (Landing Page "Below Avg" → "Average") Phase 2 - Raise Bids: - Max CPC: $8.50 → $11.00 (+29%) - Expected result: More competitive in auctions Projected Impact: QS improvement alone: Reduces Lost IS (Rank) ~10-15pp (improved Ad Rank without higher cost) Bid increase: Reduces Lost IS (Rank) additional 15-20pp Combined: Lost IS (Rank) 46% → ~15-20% (capture ~25-30pp of lost impressions) Actual Results after 45 days: - Quality Score: 6/10 → 7/10 (Landing Page fixed, Expected CTR improved) - Lost IS (Rank): 46% → 18% (-28pp, major improvement) - Search IS: 48% → 76% (+28pp) - Avg CPC: $7.20 → $8.90 (+24%, higher bids but better QS offset some) - Impressions: +62% - Clicks: +65% - Conversions: +58% - CPA: $180 → $195 (+8%, within $200 target) Key insight: Lost IS (Rank) 46% meant missing nearly half of eligible impressions due to Ad Rank. Fixing Quality Score (free improvement) + raising bids (paid improvement) reduced Lost IS (Rank) to acceptable 18%, capturing 28pp of impression share. CPA increased only 8% because Quality Score improvements offset bid increases partially. If had only raised bids without fixing QS, would have needed $13-14 CPCs to achieve same IS, pushing CPA to $240-250 (unprofitable).
Lost IS (Rank) diagnoses competitiveness problems that adding budget won't fix. Campaign with 40% Lost IS (Rank) and 5% Lost IS (Budget) won't improve from budget increases—it needs higher bids or better Quality Score. This prevents wasted budget increases: without checking Lost IS (Rank), advertiser might triple budget expecting more traffic, but Lost IS (Rank) remains high and impressions barely increase. Lost IS (Rank) also reveals Quality Score issues: if bids are already competitive but Lost IS (Rank) is 25%, low Quality Score (poor ad relevance, bad landing page) is the problem. Improving Quality Score can reduce Lost IS (Rank) while lowering CPCs simultaneously—higher Ad Rank at lower cost.
Raising bids without checking Quality Score first—25% Lost IS (Rank) + "Below Average" Expected CTR means Quality Score is dragging down Ad Rank. Improving ad relevance might reduce Lost IS (Rank) more than bid increases, at lower cost.
Ignoring Lost IS (Rank) because budget is unconstrained—advertisers with 0% Lost IS (Budget) assume campaign is maximized, missing 30% Lost IS (Rank) stealing traffic. Unlimited budget can't buy impressions if Ad Rank is too low.
Not segmenting Lost IS (Rank) by keyword—campaign-level Lost IS (Rank) 15% might hide keyword-level variations: "emergency plumber" has 5% Lost IS (Rank), "plumbing services" has 35%. Need keyword-level bid adjustments, not blanket campaign changes.
Diagnose Quality Score before raising bids for Lost IS (Rank)—if Quality Score shows "Below Average" components (Expected CTR, Ad Relevance, Landing Page Experience), fix those first. Improving QS from 5/10 to 7/10 can reduce Lost IS (Rank) 10-15pp without bid increases.
Raise bids by 20-30% as first step if Quality Score is "Average" or better—if QS is already decent (6-8/10), competitiveness is bid-constrained. Increase max CPCs 25% and monitor Lost IS (Rank) reduction. Should see 10-20pp improvement within 1 week.
Use keyword-level Lost IS (Rank) to prioritize optimizations—keywords with high Lost IS (Rank) (>30%) and high conversion value need attention first. Raise bids or improve ads for those specific keywords before campaign-wide changes.
Consider whether capturing Lost IS (Rank) is profitable—reaching 95% IS might require doubling bids, increasing CPA by 80%. If current 60% IS is already at target CPA, accepting 30% Lost IS (Rank) is better than unprofitable expansion.
Percentage of impressions your ads received out of total eligible impressions on Google Search Network (actual impressions ÷ eligible impressions × 100).
Percentage of Search impressions lost because your daily budget was too low to show ads for all eligible searches.
A score that determines your ad position and whether your ad shows at all, calculated using bid amount, Quality Score, and other auction-time factors.
Google's rating (1-10) of your ad's relevance to keywords and landing pages.
A Quality Score component measuring how likely your ad is to be clicked based on historical performance, rated as Above Average, Average, or Below Average.
Check your Quality Score components first, then decide: If Quality Score shows "Below Average" for any component (Expected CTR, Ad Relevance, Landing Page Experience): Fix Quality Score FIRST. "Below Average" QS components indicate your ads/landing pages are underperforming—raising bids is treating symptom, not cause. Improving QS is free (no increased bid cost) and compounds (better QS → higher Ad Rank → lower CPC). Steps: Ad Relevance "Below Average" → add target keywords to headlines, improve benefit messaging. Expected CTR "Below Average" → test new ad copy, add offers/CTAs, improve headline variety. Landing Page "Below Average" → speed up page load (<2.5s), improve message match, simplify navigation. Result: Improving QS from 5/10 to 7/10 can reduce Lost IS (Rank) by 10-20pp without spending more. If Quality Score shows "Average" or "Above Average" for all components: Your ads/landing pages are fine—competitiveness is purely bid-driven. Increase max CPCs by 20-30% to improve Ad Rank. Monitor Lost IS (Rank) reduction after 1 week. Should see 10-20pp improvement. If still high, raise bids additional 15-20%. Hybrid approach (both QS + bids need work): Start with low-hanging QS fruit (landing page speed, add keyword to 1-2 headlines). After 2 weeks, raise bids 20% to capture remaining Lost IS. QS improvements reduce how much you need to raise bids. Real example: Campaign with Lost IS (Rank) 35%, QS 5/10 ("Below Avg" Landing Page, "Average" others), max CPC $6. Approach: Week 1-2: Fix landing page (compress images, 4.2s → 1.8s load time). QS improves 5/10 → 6/10. Lost IS (Rank) drops 35% → 26% (9pp improvement, no cost). Week 3-4: Raise max CPC $6 → $7.80 (+30%). Lost IS (Rank) drops 26% → 12% (14pp improvement). Total: Lost IS (Rank) reduced 23pp (35% → 12%), CPC increased only 25% (vs 60-80% if had only raised bids without QS fix).
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