Definition
Factual density is how many checkable statements a passage contains: names, dates, quantities, conditions and specifications. Unlike readability, which measures how easily a sentence is understood, factual density measures how much there is in it to understand. Retrieval favors dense passages, because a dense passage answers more of the question at once.
At a glance
- CategoriesContent
- Related fieldsContent, GEO
- DifficultyIntermediate
At a glance
- Factual density counts checkable statements rather than words, so a short paragraph can be denser than a long one.
- Marketing copy scores low by default: adjectives where a specification should be.
- A dense paragraph can be matched against a question, because there is something in it to match.
Adjectives do not match anything
“Fast”, “affordable”, “market-leading” and “designed for growing teams” are not facts. They cannot be verified, they cannot be contradicted, and they do not distinguish you from the competitor using the same four words.
A retrieval system comparing your paragraph with a question is looking for overlap in substance. “Ships in two working days to UK mainland addresses” gives it something. “Fast delivery” gives it almost nothing, because every competitor says the same thing and none of the words narrow anything down.
Density is also what makes a passage safe to quote. A model repeating a specification is on firm ground. A model repeating your adjective is just passing on your marketing, and systems increasingly avoid doing that.
The page reads well and retrieves badly
This failure is hard to catch in review, because low-density copy reads perfectly well. It is smooth, on-brand and approved by everyone.
Then a shopper asks whether a product fits a particular vehicle, works below freezing, or ships to Ireland. Your page discusses quality and craftsmanship. A competitor’s page lists the fitment, the temperature range and the shipping destinations, so the competitor gets named.
Nobody on your team will spot this from the page itself, because they already know the answers. The gap only shows up when you read your copy as a stranger with a specific question, which is exactly how a retrieval system reads it.
Turn adjectives into specifications
Take one product or service page and run it through this.
- Highlight every claim that cannot be checked. Fast, premium, flexible, industry-leading, tailored.
- Replace each one with the fact behind it. Somebody in the business knows the number. Ask them, then write it down.
- Add the conditions, because the qualifier is a fact too. “Two working days, UK mainland, ordered before 3pm” beats a bare figure.
- Put each fact in a sentence rather than only in a table or an image, so it survives being retrieved as text.
Read the page again afterwards. If it now sounds less impressive and more useful, that is the trade, and it is the right one. Pair it with information gain on the questions your competitors leave unanswered.
Frequently asked questions
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How do I measure factual density?
Count the checkable claims in a paragraph and compare that to its length. There is no standard score and you do not need one: reading a paragraph and marking every statement a customer could verify is enough to rank your pages against each other and show you which ones are empty.
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Is factual density the same as information gain?
They are related and not identical. Factual density is about how much verifiable content sits in a passage. Information gain is about whether any of it is new relative to what is already published. A page can be dense and add nothing, by restating facts every competitor already lists.
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Can a page be too dense?
Yes. A paragraph packed with numbers and no explanation reads like a datasheet and loses a human reader, and it can retrieve poorly too, because there is no sentence stating what the numbers mean. Alternate: state the fact, say why it matters, move on.
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Does this matter if my competitors are just as vague?
It matters more. When every page in a category speaks in adjectives, the first one to publish real specifications is the only page that can answer a specific question, and it gets named for a while without opposition. Vague competitors are an opportunity, not permission to match them.
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Does brand copy need this?
No, and forcing it there makes the writing worse. A manifesto page, a founder story or a campaign headline is doing a different job. Concentrate density where questions get answered: product detail, specifications, support, pricing, comparisons and your FAQ content strategy.