Domain Authority: What It Is, How It Works, and Why AI Search Changed It
Updated June 2026 | 8 min read | Managed SEO | Managed GEO
DEFINITION
Domain Authority (DA) is a proprietary metric developed by Moz, scored 0–100, that estimates how likely a website is to rank well in organic search results based on the quality and quantity of links pointing to it. It is a predictor, not a Google ranking factor — but it correlates strongly with organic visibility. Higher DA means more ranking potential across competitive keywords.
How Domain Authority is calculated
Moz calculates DA using a machine-learned algorithm that analyses the link graph of the web. The primary inputs are:
Linking root domains — The number of unique domains linking to your site. One link from 100 different sites is far more valuable than 100 links from the same site. Volume of referring domains is the single strongest driver of DA.
Link quality and authority — A link from the BBC or Harvard carries more weight than a link from a newly registered blog. The authority of the linking site transfers to the receiving site, so the DA of your referring domains directly influences your own.
MozRank and MozTrust — Moz’s internal link popularity metrics that underpin the DA calculation. MozRank measures raw link equity; MozTrust measures whether your links come from sites in the trusted web graph (edu, gov, established editorial sites).
Spam score — Links from low-quality or spammy sites can suppress DA. Moz’s spam score penalises domains with suspicious link profiles.
DA scores are logarithmic, not linear. Moving from DA 10 to DA 30 is far easier than moving from DA 60 to DA 70. The higher your current score, the harder the next increment becomes because you are competing with sites that have accumulated authority over years.
Domain Authority vs Domain Rating vs URL Rating
DA is the Moz metric. Ahrefs has its own equivalent called Domain Rating (DR), also scored 0–100, which uses a similar link graph methodology but weights link equity differently. Neither is a Google metric — Google does not use DA or DR directly in its ranking algorithm.
Page Authority (PA) measures the same thing at the individual page level rather than the whole domain. A page with many links pointing directly to it can have high PA even if the overall domain DA is modest.
Ahrefs’ URL Rating (UR) is the page-level equivalent of DR. Both are useful for evaluating the link strength of specific pages you want to rank or earn citations for.
⚠ IMPORTANT DISTINCTION
Domain Authority is a Moz metric, not a Google metric. Google has confirmed it does not use DA or DR in its ranking systems. These scores are useful for comparing relative link strength between sites, but they are proxies — not official signals. When a vendor says “your DA is low, so you rank poorly”, they are making an inference, not stating a fact.
Domain Authority in the era of AI search
AI engines do not use DA directly, but they draw from similar signals. When ChatGPT, Perplexity, or Google AI Overviews decide which brands to cite, they rely on crawled web data — and the sources they cite most often are those with high editorial authority, strong backlink profiles, and credible third-party mentions.
In other words: the same work that improves your Domain Authority also improves your AI citation rate. The mechanism is different but the actions are the same. Building editorial backlinks, earning coverage in authoritative publications, and accumulating trust signals all serve both goals simultaneously.
What DA does not capture — and what matters specifically for GEO — is content structure. An authoritative domain that buries its answers in dense paragraphs will lose AI citations to a lower-DA site that uses clear definitions, structured FAQ content, and direct language. GEO requires both authority and structure. DA helps with the former.
How to improve your Domain Authority
Earn editorial backlinks — The fastest way to move DA is to earn links from sites that already have high DA. Guest posts on industry publications, being cited in research roundups, and earning links from news coverage are the most effective routes. Our authority building service focuses exclusively on this.
Build a diversified referring domain profile — Ten links from ten different domains moves the needle more than ten links from the same domain. Concentrate on breadth of referring domains, not volume from any single source.
Fix toxic backlinks — Low-quality or spammy inbound links can actively suppress DA. Use Moz’s spam score or Google Search Console to identify and disavow links that do more harm than good.
Strengthen your technical foundation — A slow, poorly structured site earns fewer natural links. Core Web Vitals, mobile performance, and crawlability all affect whether publishers choose to link to you. See our guide to Technical SEO.
Publish link-worthy content — Original research, data studies, definitive guides, and tools attract organic links over time. Content that answers specific questions well — in a format that’s easy to cite — performs best.
✓ NBound VIEW
We use Ahrefs Domain Rating as our primary link authority metric because it tends to update faster and reflects the current link graph more accurately than Moz DA for most sites we work with. We track it monthly as part of our SEO analytics reporting. Both metrics tell broadly the same story — choose one and track it consistently rather than switching between them.
What is a good Domain Authority score?
There is no universal answer because DA is a relative metric. What matters is how your DA compares to the domains you are competing with for specific keywords, not an absolute threshold.
As a rough benchmark: DA under 20 means you will struggle against established competitors on competitive terms; DA 20–40 is workable for less competitive niches; DA 40–60 is competitive for most B2B keywords; DA above 60 opens up most keyword opportunities. But a DA 25 site can outrank a DA 60 site on a specific query if its content is more relevant, more structured, and better matched to intent.
Track your DA trend over time, not the number in isolation. Consistent upward movement over 6–12 months is the signal that matters.
Frequently asked questions about Domain Authority
Is Domain Authority a Google ranking factor?
No. Domain Authority is a Moz metric, not a Google metric. Google has confirmed it does not use DA in its ranking systems. DA is a useful proxy for link strength and correlates with rankings, but it is not the underlying signal Google uses. Treat it as a relative benchmark for comparing sites, not as a direct ranking input.
How long does it take to improve Domain Authority?
Meaningful DA improvement typically takes 3–6 months of consistent link building activity. Moz updates its DA scores monthly, but the underlying changes to your link profile take time to propagate. Moving from DA 10 to DA 30 is achievable within 6–12 months with active authority building. Moving from DA 50 to DA 60 may take 12–24 months.
Does Domain Authority affect AI citations?
Indirectly, yes. AI engines like ChatGPT and Perplexity draw from web crawl data and tend to cite sources with strong editorial authority and backlink profiles — the same signals that drive high DA. Building the link authority that improves DA also builds the trust signals that improve AI citation rates. However, content structure and freshness are equally important for AI citations and are not captured by DA at all.
What is the difference between Domain Authority and Page Authority?
Domain Authority measures the overall link strength of an entire domain. Page Authority measures the link strength of a specific page. A page can have high PA if many links point directly to it, even if the domain’s overall DA is modest. For ranking specific pages, PA (and Ahrefs’ equivalent URL Rating) is often the more relevant metric.
Related: Domain Rating (DR) · Link Building · Anchor Text · Internal Links · E-E-A-T
Services: Authority Building · Managed SEO · SEO Analytics
← Back to SEO & GEO Glossary