Domain authority – what is it, and why is it no longer enough?

Definition

Domain authority is not something Google calculates itself. It is an umbrella term for how strong and credible a domain is seen to be, and when people talk about "authority" they usually mean a specific number from an SEO tool.

What domain authority actually measures

The three most common metrics all come from third-party tools, and they measure slightly different things:

• Domain Rating (DR) – Ahrefs' measure of the strength of a domain's link profile, 0–100 on a logarithmic scale. Counts only dofollow links from unique referring domains.
• Domain Authority (DA) – Moz's predictive model, trained on real search results, which tries to forecast how well a domain can compete in search.
• Authority Score – Semrush's equivalent, which also takes organic traffic and spam signals into account.

All three use a logarithmic scale. Going from 20 to 30 is relatively easy; going from 70 to 80 is very hard. And two websites with the same score can perform very differently in practice.

Does Google use domain authority as a ranking factor?

No. Google has repeatedly confirmed that neither Moz DA, Ahrefs DR nor any other third-party metric is part of its algorithm. According to Google Search Central, its ranking systems have no single authority score for a whole domain.

That does not mean authority is irrelevant. It means the number you see in a tool is an external estimate – built by Ahrefs or Moz to compare domains – not a reflection of how Google values your website. The metric is useful as a benchmark, but it does not predict your position tomorrow.

What should you look at instead?

In a search landscape increasingly driven by AI, the emphasis is shifting from a domain's overall strength to how credible it is within a specific topic.

• Topical authority – how comprehensively and deeply you cover a subject area.
• Entity – whether search engines and AI understand what your company is, what you do and how you are connected to other known organisations.
• Citations and brand mentions – your name being mentioned in the right context, even without a link.
• Relevance per page – a strong domain does not help a page that answers the search intent poorly.

High domain authority without topical focus is no longer enough. A mid-strength domain that owns a clear topic often beats a bigger, more scattered competitor on precisely those searches.

How do you increase your domain authority?

Because the metric mainly reflects your link profile, raising it comes down to the same work that builds real authority:

• Create content that is genuinely worth linking to – original data, tools, thorough guides.
• Build relevant links from domains in your industry rather than lots of weak ones.
• Strengthen your internal link structure so that authority flows to where it does the most good.
• Be patient. Authority is built over time and cannot be rushed.

If you want to know why a website is not ranking, we cover the most common reasons in Website not ranking? The 10 most common reasons.