SEO Statistics (2026): 61 Sourced Figures

Search engine optimization (SEO) is the work of earning visibility in unpaid search results. This page collects 61 figures on the size of the search market, how people use search, how AI summaries change clicks, and how often search engines and AI crawlers visit websites. Every figure links to the filing, survey or official release that first published it. The sources are company filings from Alphabet and Microsoft, Pew Research Center, Ofcom, the US Census Bureau, the Bureau of Labor Statistics (BLS), official Google, OpenAI and Adobe releases, and Cloudflare, which is labeled as vendor-reported. Buyers who want outside help with search can see the StatWharf comparison of SEO agencies.

Key figures at a glance

Search advertising revenue

Search engines fund unpaid results with paid search ads. Revenue from those ads shows how much commercial activity flows through search. Alphabet reports a line called “Google Search & other”. Microsoft reports a line called “Search advertising”, which covers Bing, Copilot, Microsoft News, Microsoft Edge and third-party affiliates.

Alphabet’s search revenue grew in each of the last three years. In the second quarter of 2026, Google Search & other revenue was $63,271 million, against $54,190 million a year earlier. That is the 17% growth Alphabet reported for the quarter.

Microsoft’s Search advertising revenue grew by $1.3 billion or 9% in fiscal 2026. Microsoft attributes the growth in revenue excluding traffic acquisition costs to higher search volume and revenue per search, as well as third-party partnerships.

Paid clicks and cost per click

Alphabet discloses the change in paid clicks and cost per click on Google Search & other properties. Paid clicks count clicks on ads by users of Google search properties. The metrics give an indirect read on search volume and on what advertisers pay for each visit.

Paid click growth rose from 6% for full-year 2025 to 13% in the second quarter of 2026. Cost per click growth slowed over the same span. Alphabet states that paid clicks move with search queries, advertiser spending and product changes. For SEO teams, rising paid clicks show that commercial search demand on Google was still growing in 2026.

AI search features and chat assistants

Google now places AI-generated answers inside its search results. It reports two features: AI Overviews, which appear above standard results, and AI Mode, a conversational search mode. OpenAI reports usage of ChatGPT, which many people also use to look for information.

In its July 2026 earnings remarks, Alphabet stated that AI Mode, like AI Overviews, drives an incremental increase in Search queries overall. It also stated that Google now sends billions of clicks to websites every week through AI features in Search. Alphabet did not publish a click total for the period.

The OpenAI usage figures come from a study of 1.5 million consumer conversations, released with a National Bureau of Economic Research working paper. “Asking” covers messages where people seek information or advice. That category is the closest match to a search query.

How AI summaries change clicks

Pew Research Center measured what Google users did after a search in March 2025. The study used browsing data from 900 US adults in its KnowledgePanel Digital panel and covered 68,879 unique Google searches. It shows associations between AI summaries and clicks. It does not prove that summaries cause the difference.

Pew also looked at which searches produce summaries and what the summaries cite.

• Only 8% of one- or two-word searches produced an AI summary.
• The share rose to 53% for searches with 10 words or more.
• 60% of searches that began with question words such as “who”, “what”, “when” or “why” produced an AI summary.
• 88% of AI summaries cited three or more sources.
• The median AI summary was 67 words long.
• Wikipedia, YouTube and Reddit together made up 15% of the sources listed in AI summaries.
• 6% of the sources linked in AI summaries were .gov websites, compared with 2% in standard results.

For site owners, the pattern is clear. Long, question-style queries are the ones most likely to show a summary. Those are also the queries that informational content usually targets.

What searchers think of AI summaries

Pew surveyed 5,153 US adults from August 18 to 24, 2025, on its American Trends Panel. The survey asked how often people see AI summaries in search results and how much they trust them.

Exposure to AI summaries is wide, but trust is shallow. About half of people who see them have some trust in the information. Very few trust it a lot. A further 52% of those who have seen summaries call them somewhat useful.

Search in the United Kingdom

Ofcom, the UK communications regulator, publishes the Online Nation report each year. The 2025 edition was published on December 10, 2025. Its audience figures come from the Ipsos iris measurement service.

Ofcom describes ChatGPT as the second-largest search service in the UK. Google still dominates by a wide margin. Ofcom also notes that most exposure to AI overviews is passive. People use their usual search engine and receive an overview with the results.

How Google tests changes to Search

Google publishes counts of the tests behind changes to its ranking and results. The figures below cover 2023, the latest year on Google’s “How Search Works” testing page at the check date. Google states that it ran over 700,000 experiments that year, resulting in more than 4,000 improvements.

The 4,781 launches equal about 13 changes to Search per day in 2023. SEO teams therefore track rankings all year, not only after named core updates.

Crawlers and referral traffic

Cloudflare operates a network that serves a large share of websites. It publishes data on bot traffic and on the referrals that search engines and AI platforms send back to sites. These figures are vendor-reported and reflect traffic on Cloudflare’s network only.

The share of crawler requests made for AI training rose from 22% in spring 2025 to 52% in June 2026. Google remains the main source of referred visitors. Cloudflare notes that traffic referred by native apps such as Claude’s does not include a Referer header. Its referral counts therefore cover web-based tools only.

The market around SEO

Three further figures describe the commercial setting for SEO work: online retail, marketing labor and SEO software.

US e-commerce sales grew 12.2% from the second quarter of 2025, against 6.7% growth in total retail sales. Online stores depend on search for product discovery, which keeps demand for SEO high in retail. BLS rates the 6% projected growth for marketing managers as faster than average. Adobe completed the Semrush acquisition on April 28, 2026. Adobe described Semrush as a brand visibility platform and linked the deal to discovery through AI assistants and agents.

Method

• Data window. Figures date from 2023 to September 2026. The 2023 Google testing counts are the latest Google has published. The page prefers the most recent release of each series.
• Primary sources only. Each figure links to the body that first published it. These are SEC filings by Alphabet and Microsoft, official Google, OpenAI and Adobe releases, Pew Research Center, Ofcom, the US Census Bureau and the BLS. Cloudflare figures are labeled vendor-reported. Statistics aggregators, SEO blogs that re-quote figures and Wikipedia were not used.
• Checks. StatWharf Editorial opened each source in October 2026 and confirmed that the figure and its date appear there. Figures that could not be found on a primary source were left out. This includes the 2024 US court finding on Google’s share of general search, because the opinion could not be retrieved from an official site at the check date. Third-party click-through-rate studies were also left out.
• No modeling. The page reports published figures. Two values are simple arithmetic on published numbers: the chart values rounded to US$ billion, and the average of 13 launches per day, which divides 4,781 launches by 365 days.
• Measures differ. Pew measured US browsing behavior in one month. Ofcom used panel measurement in the UK. Cloudflare counted traffic on its own network. Comparisons are valid within one source, not across sources.

Using these figures

The figures show a search market that is still growing in revenue and paid clicks, while AI summaries change how often a search ends in a visit. Pew found clicks on traditional results nearly halve when a summary appears. Google reports more queries overall and billions of weekly clicks from AI features. Both trends matter for planning content and measuring results. Businesses that want an agency to run that work can compare service scope, pricing disclosure and engagement minimums in the StatWharf comparison of SEO agencies. Corrections to any figure can be sent to the editorial address below.

Factual corrections are free: editorial@statwharf.com.