Domain Authority and Domain Rating are often treated as two labels for the same thing. They are not. Both are third-party SEO metrics used to evaluate websites at domain level, but they come from different companies, use different link indexes, and answer slightly different questions. That matters when comparing competitors or reviewing backlink opportunities.
The simplest distinction is this: Moz Domain Authority is designed to predict how well a domain may rank based on a machine-learning model using link metrics, while Ahrefs Domain Rating focuses more directly on the relative strength of a website’s backlink profile. Neither score is used by Google as a ranking factor. The useful question is what each metric tells you about the site behind the number.
What Domain Authority measures
Domain Authority, usually shortened to DA or Moz DA, is a proprietary Moz metric scored from 1 to 100. Moz describes it as a prediction of how well a domain can rank in Google based on a machine-learning algorithm of link metrics. DA is therefore best used as a comparative website authority score rather than as a direct measurement of Google’s view of a site.
Because Moz controls both the link index and the scoring model, DA can move as Moz discovers links or updates its data. A rise from DA 35 to 38 does not mean Google has awarded three extra authority points. It means the site’s position within Moz’s system has changed.
What Domain Rating measures
Domain Rating, or Ahrefs DR, measures the strength of a website’s backlink profile on a 0-to-100 logarithmic scale. Moving from DR 70 to 80 is therefore much harder than moving from DR 20 to 30.
Ahrefs says DR is influenced by followed links from unique referring domains, the DR of those domains, and how many other unique domains those websites link to. A strong site linking to thousands of domains spreads its influence more widely than one linking to only a small number. DR is useful for quickly comparing backlink-profile strength.
Domain Authority vs Domain Rating: the key difference
The most useful link metrics comparison is not simply “which score is better?” but “what is each score trying to represent?” DA is built as a predictive metric using Moz’s link data and machine-learning model. DR is more explicitly a link-strength metric based on relationships between referring domains.
That is why two sites can have very different DA and DR values without anything being wrong. Moz and Ahrefs crawl different portions of the web, discover links at different times, and calculate scores differently. A domain could be DA 42 and DR 58, while another might be DA 51 and DR 39. The numbers are not designed to match.
Which metric matters more for link building?
For backlink prospecting, DR often provides a useful first snapshot because it is closely tied to backlink-profile strength. But using DR alone is a weak screening process. A high-DR site may still have thin content, little relevant traffic, excessive outbound linking, or no topical connection to your website.
DA can also help with prospect comparison, especially if Moz is your main SEO platform. The better approach is to use either metric as an initial filter, then review topical relevance, referring domains, organic visibility, page quality, placement context, and the page that would contain your link.
A practical example: choosing between two backlink opportunities
Suppose you are evaluating two websites for a link to a home-improvement site. Site A has DA 56 and DR 67, but much of its recent content is unrelated and it publishes many outbound-link articles. Site B has DA 41 and DR 46, but it focuses on interiors, attracts relevant search traffic, and publishes strong editorial content around your subject.
If you choose Site A only because its website authority score is higher, you may be optimizing for a metric instead of link quality. Site B could be the stronger opportunity because its relevance and editorial context are better. DA and DR should support a decision rather than make it for you.
How to use DA and DR more intelligently
Compare sites within the same niche
A score becomes more meaningful beside realistic competitors. Judge your site against businesses covering similar topics and audiences rather than treating one DA or DR level as universally good.
Check the backlink profile behind the number
Review the referring domains and see where the authority comes from. A moderate score backed by relevant editorial links can be more useful than a higher score built on unrelated or questionable sources.
Review the linking page, not only the domain
Both DA and DR are domain-level metrics. A specific page may be much weaker or stronger than the domain suggests. Check the page’s quality, external backlinks, indexability, and how naturally your link fits the content.
Related reading such as link quality evaluation, referring domains analysis, and backlink relevance can provide context that a single authority metric cannot.
Can you compare DA and DR directly?
You can view them side by side, but you should not treat them as equivalent scales. A DA 50 site is not automatically equal to a DR 50 site. Each provider has its own database and methodology.
For reporting, consistency is more useful than switching between metrics. If you use Moz DA, track competitors and changes with Moz. If you use Ahrefs DR, keep that comparison inside Ahrefs. Using both can add context, but averaging them into one homemade authority score creates a number with no meaningful methodology.
FAQ
Is Domain Authority a Google ranking factor?
No. Domain Authority is a Moz metric, not a Google ranking signal. It is useful for comparative SEO analysis, but Google does not rank pages using Moz DA.
Is Domain Rating a Google ranking factor?
No. Domain Rating is an Ahrefs metric and is not used by Google. It measures backlink-profile strength within Ahrefs’ own system.
Why is my DA much lower than my DR?
The scores come from different link indexes and formulas. A large gap between them is normal and does not automatically indicate a problem with your website.
Should I use DA or DR for backlink decisions?
Use either as a screening metric, not as the final decision. Relevance, real traffic, editorial quality, referring domains, outbound-link patterns, and the quality of the linking page should carry more weight than one domain-level score.
The better metric depends on the question
There is no universal winner in the Domain Authority vs Domain Rating comparison. Moz DA is useful as a predictive, comparative metric within Moz’s ecosystem, while Ahrefs DR is especially practical for judging relative backlink-profile strength. Both can speed up SEO analysis, but neither replaces a proper review of the links, content, relevance, traffic, and pages behind the score.
If the real goal is stronger organic performance, focus on building a useful website and earning credible, relevant links. DA and DR are helpful gauges of competitive position, not the destination.
