Grounding Chunk
The slice of a page's content an AI system actually uses to support a sentence, drawn from a fixed per-query word budget.
When an AI system answers a query, it doesn't read your entire webpage to support its response. Instead, it pulls out a specific slice of your content, known as a grounding chunk.
Recent analysis of thousands of search queries reveals that Google operates on a fixed grounding budget of about two thousand words per query. This budget is split among various web sources based on their search rank. The top-ranked source gets the biggest slice of the pie, taking about five hundred words, or twenty-eight percent of the total budget. By the time you get to the fifth-ranked source, that share drops to just over two hundred and fifty words.
Because of this strict budget, the length of your content matters. A typical page contributes fewer than four hundred words to an AI answer. If your webpage is a concise eight hundred words, more than half of your content might get covered. But if your page is four thousand words long, that coverage drops to a mere thirteen percent.
The lesson for content strategy is clear. Content density beats sheer length. You are competing for a share of a highly limited word budget, and you cannot win that share simply by writing longer pages. Focus on high-quality, dense information, because your search rank and your content's relevance are what ultimately determine how much of your work the AI will actually use.
A grounding chunk is the slice of your page's content that an AI system actually selects to support a sentence in its answer — not your full page, just the part it uses. In Google's grounding, only these chunks genuinely back the answer, which is why Google tends to cite everything it shows.
Our analysis of 7,060 queries and 2,275 tokenized pages found each query works from a fixed grounding budget of roughly 2,000 words, split across sources by relevance rank. The #1 source gets around 531 words (about 28% of the pie); #5 gets around 266. The typical page contributes about 377 words, and coverage drops sharply as pages get longer — a tight 800-word page can get over 50% coverage while a 4,000-word page gets about 13%.
The lesson for content strategy is that density beats length: you compete for share of a fixed budget, not by adding words. Grounding chunks are the raw material behind the grounding snippet and the wider web search grounding process, and your rank determines your share.