Information Gain

Information gain is the amount of new, useful information a page offers beyond what a searcher has already seen in other results. In SEO, it describes content that adds something original, such as fresh data, first-hand experience or a new angle, rather than repeating what every other page says.

Written by Paul Hoda, SEO consultant since 2005. Last updated 8 November 2026.

Where the idea comes from

The term comes from information theory and machine learning, where it measures how much a piece of data reduces uncertainty. In SEO it became popular after a Google patent, first granted in 2022, described scoring documents on how much additional information they provide compared with documents a user has already viewed.

A patent does not prove Google uses that method in ranking. Treat “information gain as a ranking factor” as a community theory. What Google has said, in its guidance on creating helpful content, is that content should provide original information, reporting, research or analysis, and add substantial value compared with other pages in search results.

Why information gain matters

Many pages on popular topics are near copies of each other. They often come from writers studying the same top results and rewriting them. When every page says the same thing, there is little reason for a search engine to show yours, or for a reader to remember it.

Pages with real information gain tend to:

  • Answer questions other pages ignore.
  • Earn links and mentions, because they offer something worth citing.
  • Give AI search tools a distinct source to draw on, which may support citation-worthy content.
  • Show genuine experience, which matters for E-E-A-T.

How to add information gain to a page

  1. Read the current top results for your keyword and list what they all cover. That is the baseline, not the goal.
  2. Note the gaps: missing questions, outdated facts or vague advice. A content gap review helps here.
  3. Add first-hand experience: what happened when you tried it, with photos or results.
  4. Include original research or your own data where you can.
  5. Quote real experts or customers rather than generic statements.
  6. Offer practical extras such as worked examples, templates, calculators or comparison tables.
  7. Take a clear, reasoned position where other pages sit on the fence.

Examples

  • A recipe page that explains which steps failed in testing and why, not just the method.
  • A product review with measured results from real use rather than a list of specifications.
  • A local guide written by someone who lives in the area, with details visitors would not know.

Common mistakes

  • Skyscraper by length only. Making a page longer than competitors is not the same as making it more informative.
  • Writing purely from other results. Rewriting the top pages, by hand or with AI, produces the opposite of information gain.
  • Novelty for its own sake. New information still needs to be accurate and relevant to the query.

Key Takeaways

  • Information gain is the new, useful information a page adds beyond other results.
  • Its use as a ranking factor is a community theory based on a Google patent.
  • Google’s helpful content guidance does ask for original information and analysis.
  • First-hand experience, original data and expert input add information gain.
  • Rewriting existing top results adds little or nothing new.

Related Terms

Browse more terms in the SEO Encyclopedia.