Last updated September 2026.
Ask three tools what share of Google searches trigger an AI Overview, and you will get three different answers in the same week. That is not a data quality problem. It is a sampling problem, and once you see it, every number below becomes usable instead of confusing.
The AI Overview trigger rate is the share of queries in a defined set, an industry, a country, a query type, where Google shows an AI-generated summary above the organic results. It is the single most requested number in AEO planning, and the most commonly misquoted, because most articles report one global figure and stop there.
This page does not. It segments the data three ways, industry, country, and query type, then explains exactly why the underlying studies disagree.
Why no two trigger-rate studies agree
Three things distort every “AI Overview appears on X% of searches” headline you will read:
- The query sample. A panel built from commercial keywords behaves nothing like a panel built from broad, mixed-intent search terms.
- The measurement method. A daily tracked panel, a one-time SERP crawl, and clickstream-based modeling each answer a slightly different question.
- The time window. AI Overview coverage has moved by double digits within a single quarter through 2025 and 2026. A number from six months ago is already stale.
Keep those three filters active as you read the tables below.
AI Overview trigger rate by industry
BrightEdge’s Generative Parser tracks a large keyword panel daily and publishes year-over-year industry comparisons. Its February 2026 “one-year mark” report shows steep, uneven growth by vertical.
| Industry | Trigger rate (Feb 2026) | One year earlier | Source | Date |
|---|---|---|---|---|
| Healthcare | 88% | 72% | BrightEdge | Feb 2026 |
| Education | 83% | 18% | BrightEdge | Feb 2026 |
| B2B technology (SaaS, cybersecurity) | 82% | 36% | BrightEdge | Feb 2026 |
| Restaurants | 78% | 10% | BrightEdge | Feb 2026 |
| Insurance | 63% | 17% | BrightEdge | Feb 2026 |
| All industries (aggregate) | 48% | 31% | BrightEdge | Feb 2026 |
Education is the standout mover. It went from 18% to 83% coverage in twelve months, a gain of 65 percentage points, as Google expanded AI Overviews into “how do I,” “what is,” and program-comparison queries that dominate that vertical. B2B technology followed a similar path, climbing from 36% to 82%.
Ecommerce sits at the opposite extreme. BrightEdge’s panel puts ecommerce coverage near 4%, down sharply from roughly 29% a year earlier. A separate, independently run Advanced Web Ranking study of 8,000 keywords corroborates the direction: it found only 1% of ecommerce queries triggered an AI Overview at all, noting that Google appears to protect Shopping ads placement on transactional searches. Two different methodologies, same conclusion: retail and shopping queries are the least likely category to show the box.
AI Overview trigger rate by country
Country-level numbers vary even more than industry numbers, because each study samples a different mix of query types within that market. The table below deliberately includes two readings for the United States from two different datasets, to show how large that gap can be.
| Market | Trigger rate | Source | Date | Note |
|---|---|---|---|---|
| United States (commercial panel) | 48% | BrightEdge | Feb 2026 | Tracks a keyword set skewed toward commercial and informational terms |
| United States (broad international panel) | 20.5% | Ahrefs (Brand Radar, 108M queries) | Nov 2025 | Broader, less commercially skewed keyword mix; 140M US keywords sampled |
| Indonesia | 37.2% | Ahrefs (Brand Radar) | Nov 2025 | Highest rate among the largest markets in the dataset |
| India | 26.8% | Ahrefs (Brand Radar) | Nov 2025 | |
| United Kingdom | 19.1% | Ahrefs (Brand Radar) | Nov 2025 | |
| Germany | 20% | SISTRIX (100M+ keyword analysis) | Mar 2026 | Up from 17% in the prior reading |
| France | 53% | SE Ranking (100k keywords) | 2026 | Measured in the first month after Google enabled AI Overviews in France |
| Global (scope not confirmed by publisher) | ~40 to 43% | Similarweb (Generative AI Landscape report) | 2026 | Similarweb’s own report frames this as “>40% of US searches”; other coverage of the same report cites 43% without confirming whether the figure is US-only or worldwide |
The two US rows are the clearest illustration of why “what percentage of searches show an AI Overview” has no single honest answer. BrightEdge and Ahrefs are both credible, both tracking large keyword sets, and both reporting on roughly the same time period, yet one number is more than double the other. BrightEdge’s panel is built around commercial and marketing-relevant keywords, the kind of terms brands actually track. Ahrefs’ Brand Radar panel is broader and less commercially filtered.
France is the sharpest reminder that these numbers are moving targets, not fixed facts. Google had not launched AI Overviews there at all through most of 2025. Within three days of the July 2026 launch, SE Ranking’s tracked panel already showed AI Overviews on more than half of French queries. A country with a 0% trigger rate can become a top-tier market in under a week once Google flips the switch.
AI Overview trigger rate by query type
Query type predicts trigger likelihood better than almost any other variable. Two independent studies, using different methods, converge on the same shape: informational, question-based queries dominate; commercial and transactional queries barely register.
| Query type | Trigger rate | Source | Date |
|---|---|---|---|
| ”Why” / reason questions | 60% | Ahrefs (146M SERPs) | Nov 2025 |
| Question queries (any) | 58% | Ahrefs (146M SERPs) | Nov 2025 |
| Definition queries | 47% | Ahrefs (146M SERPs) | Nov 2025 |
| How-to / instruction queries | 35% | Ahrefs (146M SERPs) | Nov 2025 |
| Comparison queries (“X vs. Y”) | 26% | Ahrefs (146M SERPs) | Nov 2025 |
| Informational intent (overall) | 21% | Advanced Web Ranking (8,000 keywords) | 2026 |
| Commercial intent | 3.5% | Advanced Web Ranking (8,000 keywords) | 2026 |
| Navigational intent | 0.1% | Advanced Web Ranking (8,000 keywords) | 2026 |
The gap between “why” questions (60%) and navigational searches (0.1%) is the widest spread in this entire piece, and it is the most actionable one. If your content targets reason-based, definitional, or how-to queries, you are already competing directly with an AI Overview on the large majority of your keyword set. If your content targets brand-navigational or checkout-adjacent queries, the box barely appears, and your organic listing still does most of the work.
Why estimates differ by 2 to 3 times, in plain terms
By now the pattern across all three tables should be obvious. The same underlying phenomenon, Google showing an AI-generated summary, produces wildly different reported rates depending on four factors:
- Sample composition. Commercial-only panels (BrightEdge) report higher rates than broad, mixed-intent panels (Ahrefs) for the exact same country in the exact same season.
- Measurement method. A daily tracked panel, a single large crawl, and clickstream-derived modeling (Similarweb) are three different instruments, not three readings of the same instrument.
- Geography and language. English-language, US-based queries trigger AI Overviews at different rates than Spanish, Portuguese, or Indonesian queries, and a “global” figure that does not disclose its language mix is not comparable to a single-country figure.
- Timing. Coverage moved from roughly 31% to 48% on BrightEdge’s panel in a single year. A brand-new market like France went from 0% to over 50% in three days. Any figure older than a few months should be treated as historical, not current.
None of this means the statistics are unreliable. It means a single global percentage, quoted without its sample, is close to useless for planning. The segmented numbers above are the ones you can actually act on.
How to measure your own trigger set
Industry-wide averages tell you the landscape. They do not tell you what happens for your specific brand’s queries. To get that, you need to track a fixed prompt set over time.
A handful of tools approach this differently, and none is a universal best fit:
- Semrush tracks AI Overview presence as one signal inside its broader position-tracking suite, useful if you already run keyword rank tracking there and want AI Overview flags layered on top.
- BrightEdge runs the large-scale Generative Parser panel behind several of the industry figures cited above; it is built for enterprise SEO teams already managing a BrightEdge deployment.
- SE Visible (the AI-visibility layer inside SE Ranking) tracks daily AI Overview presence alongside traditional rank tracking, with a standalone entry point for teams that want AEO monitoring without a full enterprise SEO platform.
- Temso is an all-in-one AEO platform: it tracks presence and citations across Google AI Overviews, ChatGPT, Perplexity, Gemini, and Microsoft Copilot from a single prompt set, then generates the content and schema fixes to close the gaps it finds. Pricing starts at $89/mo (Starter), with Growth at $199/mo and Professional at $499/mo; every plan includes unlimited projects, users, and recommendations, with a discount for annual billing.
Whichever tool you choose, the method matters more than the vendor. Build a prompt set that mirrors your real buyers’ language across informational, commercial, and comparison intent, hold that set constant, and re-run it on a fixed schedule. A single snapshot tells you almost nothing given how fast the underlying rates move.
What this means for your AEO program
Three practical conclusions follow from the data above:
- Stop citing a single global percentage. Whether AI Overviews appear on 20%, 43%, or 48% of searches depends entirely on which queries you mean. Segment your own tracking by industry and intent before you report a number internally.
- Prioritize by query type, not just topic. “Why,” definition, and how-to content faces the heaviest AI Overview competition. Comparison and navigational content faces far less.
- Re-measure often. With coverage moving by double digits within a quarter, and entire countries going from 0% to over 50% in days, last quarter’s trigger rate is not this quarter’s trigger rate.
Track the queries that matter to your business specifically, segmented the way the tables above are segmented, and you will have a far more useful number than any single headline statistic.
Sources cited in this piece
| Source | What it measured | Published |
|---|---|---|
| BrightEdge, “AI Overviews at the One-Year Mark” | AI Overview coverage by industry and in aggregate | Feb 2026 |
| Ahrefs, “What Triggers AI Overviews? 86 Factors and 146 Million SERPs Analyzed” | Trigger rate by query type, question category, and intent | Nov 2025 |
| Ahrefs, “AI Overviews International” (Brand Radar, 108M queries) | Trigger rate by country | Nov 2025 |
| Advanced Web Ranking, AI Overview Study (8,000 keywords) | Trigger rate by intent and by ecommerce vertical | 2026 |
| SISTRIX, Germany AI Overview analysis (100M+ keywords) | Germany trigger rate and CTR impact | Mar 2026 |
| SE Ranking, France AI Overview launch study (100k keywords) | France trigger rate at launch | 2026 |
| Similarweb, Generative AI Landscape report | US / global trigger rate estimate | 2026 |
For the full AEO tool landscape, see /rankings/aeo-tools. For scoring criteria, see /methodology. For term definitions, see /glossary.
Ready to track your own AI Overview trigger rate instead of guessing from a headline? Start with Temso at $89/mo: build a fixed prompt set across five engines, watch your trigger and citation rate move month over month, and get the content and schema fixes to close the gaps you find.