What is topical authority? Definition and how to build it

Topical authority is how far search engines and AI models trust a site or brand as a complete source on a subject. How to build it and how to measure it.

  • Alvaro Peña de Luna Alvaro Peña de Luna
  • date icon

    Wednesday, Sep 30, 2026

Topical authority is the degree to which search engines and AI models treat a website or brand as a reliable, complete source on a specific subject, earned by covering that subject in depth, connecting the related pages and being referenced by others who write about it.

It is not a score you can look up. It is an outcome you build, and one you can observe in how often you appear across a topic's questions.

How topical authority works

Four things tend to make a site the obvious source on a subject:

  • Breadth. The site covers the questions around the topic, from basics to edge cases, not just its head term.
  • Depth. Each page answers its question completely, with specifics a generalist page would skip.
  • Structure. Pages link to each other in a logical way, usually a hub page for the topic and cluster pages for its subtopics, so the whole reads as one body of work.
  • Recognition. Other sites, reviews, forums and the press mention the brand in connection with the topic.

None of these is new to SEO. What changes in AI search is how they show up in the answers.

An AI engine builds its answer from what it knows and what it retrieves. A brand that has covered a topic thoroughly, on its own site and through third-party mentions, gives the engine more relevant passages to retrieve for more variations of the question, and more consistent evidence that the brand belongs in the answer. A brand with one good page on the topic appears for the questions that page answers and disappears for the rest.

That is why topical authority reads best at topic level: not "do we appear for this prompt?" but "for what share of this topic's prompts do we appear, and against whom?".

How to build topical authority

  1. Map the topic. List the subtopics and the questions buyers ask at each stage.
  2. Audit what you have. Mark each question as covered well, covered thinly or missing. Merge pages that answer the same question.
  3. Fill the gaps in order of value. Start with the questions closest to a buying decision.
  4. Link the cluster. Connect the hub and its subpages with descriptive anchor text.
  5. Show who is behind it. Named authors with real experience support the trust side of E-E-A-T.
  6. Earn mentions. Data, tools and expert commentary give other sites a reason to reference you on the topic.

How to measure topical authority

In organic search, a common proxy is the share of a topic's keywords where you rank in the top positions. In AI search, the equivalent is how often engines name you across a set of prompts about the topic, which is Mencoro's Coverage metric applied to a group of prompts:

Coverage = checks in which you were named ÷ checks that returned an answer × 100

Example: you group 40 prompts about payroll software and check them weekly on ChatGPT. Over four weeks that is 160 checks. If ChatGPT names your brand in 48 of them, your Coverage for the topic is 30%. Repeat the same group for a second topic and you can see where you are an authority and where you are absent.

How Mencoro tracks authority by topic

In Mencoro, groups are sets of queries you use to read results by topic, and a query can belong to several groups. For each group you see Coverage (how often you are named), Favorability (how positively), share of voice against your tracked competitors, and your mention and link positions, on ChatGPT, Perplexity, Google AI Overview and Google AI Mode. Answers also list untracked competitors, the other brands engines name for the topic, so you can spot who holds the authority you are missing. The competitor analysis view compares you with the competitors you track, and the methodology page explains every formula.

Common mistakes

  • Volume without depth. Publishing many short posts on loosely related keywords spreads the site thin.
  • Drifting off topic. Content far from what you sell dilutes what the site is known for.
  • Orphan pages. A page with no internal links to it looks isolated, however good it is.
  • Measuring one prompt. A single answer tells you little. Read the topic as a group.
  • Entity SEO: making your brand a clear entity connected to its topics.
  • E-E-A-T: the experience and trust signals behind authoritative content.
  • Share of voice: your share of the conversation against competitors.
  • Prompt tracking: monitoring AI answers to a fixed set of prompts over time.

FAQ

Frequently asked questions

Not as a single score. Google does not publish a topical authority metric. The term describes an outcome of many signals Google does use: relevant, helpful content, how pages link together and how other sites reference you. Treat it as a strategy, not a number to chase.
It depends on the topic, the competition and where you start. It is built over months of consistent publishing, updating and earning mentions, not in one content sprint. Track progress on the topic's queries rather than waiting for a single signal.
Yes. Authority is about depth on a subject, not size. A small site that covers one narrow topic completely can be a better source for it than a large site that touches it once.
Domain authority scores, such as those from SEO tools, estimate the overall strength of a site's backlink profile across every topic. Topical authority is specific to one subject: a site can be strong in general and still weak on the topic you care about.

Start tracking your brand in AI search today

Monitor how AI engines cite your brand, track keyword positions, and benchmark against competitors, all in one platform.