The percentage of impressions your ads received out of the total impressions they were eligible to receive.
What is Impression Share in Google Ads? Impression Share is the percentage of impressions your ads received out of total eligible impressions. For example, 60% impression share means your ads showed 60 out of every 100 possible times. Brand keywords should achieve 80-95% IS, while competitive non-brand keywords typically see 10-60% IS.
Impression Share (IS) is the percentage of impressions that your ads receive compared to the total number of impressions that your ads could get. According to Google, "Impression share (IS) is the percentage of impressions that your ads receive compared to the total number of impressions that your ads could get." It's calculated as: Impression Share = (Impressions Received ÷ Total Eligible Impressions) × 100%.
Impression Share reveals how much of your potential audience you're actually reaching. A 60% impression share means your ads showed 60 times out of every 100 opportunities, while competitors or budget constraints prevented the other 40 impressions. Google reports why you lost impression share through two critical metrics: Lost IS (budget) shows the percentage lost due to insufficient daily budget, while Lost IS (rank) shows the percentage lost because your Ad Rank was too low to compete.
The metric varies dramatically by keyword competition and campaign goals. Brand keywords should achieve 80-95% impression share since you want to dominate searches for your own company name. Non-brand keywords typically see 10-60% impression share depending on budget and competition—even well-optimized accounts rarely exceed 30-40% IS for highly competitive terms. Search impression share averages 50-70% for most campaigns, while Display impression share typically runs 10-25% due to the massive inventory available.
Official Source: Definition verified from Google Ads Help Center (Last verified: January 2026)
"Impression share (IS) is the percentage of impressions that your ads receive compared to the total number of impressions that your ads could get."
An HVAC company targets "AC repair Dallas" with 10,000 eligible impressions per month. Their ads showed 3,500 times.
Impression Share = (3,500 impressions ÷ 10,000 eligible) × 100% = 35% Lost Impression Share breakdown: - Lost IS (budget): 45% (4,500 impressions lost to insufficient daily budget) - Lost IS (rank): 20% (2,000 impressions lost to low Ad Rank) Actionable insight: The HVAC company is losing 45% of potential impressions to budget constraints. Since their current ROAS is 4:1 (profitable), they should increase daily budget by 50% to capture those 4,500 lost impressions. The 20% Lost IS (rank) suggests their Quality Score needs improvement—fixing landing page speed could recapture those impressions without spending more.
Impression Share directly indicates growth opportunities. If your brand keyword has 65% impression share with 20% Lost IS (budget), you're leaving money on the table—increasing budget could capture 20% more branded searches from customers actively looking for you. Similarly, 30% Lost IS (rank) signals that improving Quality Score or bids could unlock significant additional traffic without budget increases.
The metric also reveals competitive positioning. Auction Insights shows your impression share versus competitors—if you have 40% IS and your main competitor has 60%, they're capturing 50% more visibility than you. Low impression share (under 30%) often indicates you're fighting for scraps while competitors dominate the auction. High impression share (80%+) suggests market leadership or targeting efficiency. Monitoring impression share trends helps detect when new competitors enter your space or when seasonal demand changes affect your visibility.
Chasing 100% impression share on expensive non-brand keywords (wastes budget on unprofitable clicks)
Ignoring Lost IS (budget) warnings when campaigns are profitable—missing easy growth opportunities
Treating all low impression share as bad (10-30% IS can be fine for expensive, high-converting keywords)
Only looking at campaign-level IS instead of keyword-level IS where issues actually occur
Comparing Search and Display impression share directly (Display IS is naturally 10-20x lower)
Target 80-95% impression share for brand keywords—you should own searches for your company name
For non-brand keywords, use Lost IS metrics to prioritize—fix Lost IS (budget) if ROAS is profitable
Address Lost IS (rank) by improving Quality Score rather than blindly raising bids (cheaper long-term)
Monitor keyword-level impression share weekly and pause keywords under 5% IS that aren't converting
Use Target Impression Share bidding for brand protection (set to 90% absolute top IS)
Check Auction Insights monthly to see competitor impression share and overlap rates
Don't chase high IS on broad match keywords—they drain budgets with 60%+ impression share
A "good" impression share depends entirely on your campaign type and keywords. For brand keywords (searches for your company name), target 80-95% impression share—you should dominate searches for your own brand. For non-brand keywords, 10-60% is typical depending on competition and budget. Highly competitive industries like legal or insurance often see 15-30% impression share on expensive keywords, and that's perfectly acceptable if conversion rates and ROAS are strong. The key question isn't "Is my IS high enough?" but rather "Am I profitable at my current impression share, and could I profitably scale by fixing Lost IS (budget) or Lost IS (rank)?"
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