Domain Authority is a score that predicts how well a website will rank in search results

Domain Authority (DA) is a number from 1 to 100 that estimates how likely your website is to rank in Google search results. It is calculated by Moz, a private company that studies search engine behavior, and is based on how many other websites link to yours and the quality of those links. A higher score means search engines treat your site as more trustworthy and authoritative on its topic.

Domain Authority is not a Google metric — Google does not publish it or use it directly in its ranking system. Instead, it is a third-party tool designed to give website owners a rough sense of their competitive standing. Think of it as a prediction model rather than an official grade. A site with a DA of 45 will not automatically rank higher than a site with a DA of 35, but statistically, sites with higher DA scores tend to rank better across many searches.

The score updates roughly once a month. You can check your own Domain Authority for free on Moz's website by entering your domain name, or through other SEO tools that license Moz's data.

Key Takeaways

  • Domain Authority ranges from 1 to 100 and is based primarily on the number and quality of websites linking to yours.
  • It is a prediction tool made by Moz, not an official Google ranking factor, but sites with higher DA tend to rank better in practice.
  • You can check your Domain Authority free on Moz.com or through other SEO tools that use Moz's data.
  • A single high-quality link from an authoritative site helps more than many links from low-authority sites.
  • Domain Authority alone does not determine rankings — page-level factors like content quality and relevance matter just as much.

How Domain Authority is calculated

Moz builds Domain Authority by analyzing the links pointing to your website from other domains. The algorithm looks at two main things: how many unique domains link to you, and how authoritative those linking domains are themselves. A link from a well-known news site or university carries more weight than a link from a brand-new blog.

The score also considers the total number of links (called backlinks) your site has, though quantity matters far less than quality. A website with 50 links from respected industry sources will have higher DA than a site with 500 links from low-quality directories or comment spam.

Moz updates its Domain Authority data roughly monthly by re-crawling the web and recalculating scores. Your DA may shift up or down depending on new links you have earned, links you have lost, or changes in the authority of sites linking to you. These shifts are usually small — a jump of 5 points in a month is significant.

The difference between Domain Authority and Page Authority

Domain Authority measures your entire website's strength. Page Authority (PA) is a separate score that measures a single page on your site. A page can have high PA even if your domain has low DA, especially if that page has earned many high-quality links.

For search ranking purposes, Page Authority often matters more than Domain Authority. Google ranks individual pages, not entire domains. A well-linked article on a brand-new website can outrank a poorly-linked page on an established site. However, a strong Domain Authority makes it easier for all your pages to rank because Google starts with more trust in your domain.

Why Domain Authority matters, and why it does not

Domain Authority matters because it correlates with ranking success. Studies of thousands of search results show that sites with higher DA scores appear in top positions more often than sites with lower scores. If you are competing against sites with DA 60 and yours is DA 25, you are starting from a disadvantage — though not an impossible one.

Domain Authority does not matter because Google does not use it. Google's actual ranking system considers hundreds of factors: content quality, page speed, mobile-friendliness, user experience, topical relevance, and many others. A site with DA 50 and poor content will lose to a site with DA 30 and excellent content. Domain Authority is useful as a competitive benchmark, not as a direct ranking lever.

Many SEO professionals treat DA as a rough health check for a website. If your DA drops suddenly, it might signal that you have lost important links or that your site has been penalized. If it climbs steadily, it suggests your link-building efforts are working. But the score itself is not something you optimize for directly.

How to improve your Domain Authority

The only way to raise Domain Authority is to earn links from other websites. This happens through several common routes: publishing content that other sites want to link to, getting mentioned in news coverage, being listed in industry directories, or building relationships with other site owners in your field.

Focus on earning links from sites that are themselves authoritative and relevant to your topic. A link from a competitor's website or a respected industry publication is worth far more than a link from a low-quality directory or a paid link network. Quality always beats quantity.

Avoid buying links or participating in link schemes. Google penalizes websites that violate its link guidelines, and penalties can tank your rankings far more than a low Domain Authority ever would. Natural links earned through good content and genuine relationships are the only sustainable path.

Domain Authority compared to other ranking signals

Several other metrics compete for attention in SEO. Trust Flow (from Majestic) and Citation Flow (also Majestic) measure link quality and quantity differently than Moz does. Ahrefs Domain Rating uses its own algorithm. These tools all try to predict ranking success, but they use different data and math, so a site might have high DA but lower Ahrefs DR, or vice versa.

None of these metrics are official Google signals. Google publishes its own tools — Search Console and PageSpeed Insights — that show real data about how your site performs in search. These are more directly actionable than Domain Authority because they show actual Google behavior, not predictions.

For most website owners, Domain Authority is useful as one data point among many. It tells you roughly how competitive your domain is, but it should not drive your entire SEO strategy. Focus first on content quality, user experience, and earning links naturally. Domain Authority will follow.

Frequently Asked Questions

Is a Domain Authority of 30 good?

It depends on your industry and competitors. DA 30 is above average for a new or small website, but below average if you are competing against established brands. Check the DA of your top three competitors — if yours is lower, you have work to do. If it is similar or higher, you are competitive on that metric.

Can I check someone else's Domain Authority?

Yes. Go to Moz.com, enter any domain name in the search box, and you will see its DA. Many other SEO tools also show DA for any website. This is useful for researching competitors or evaluating whether a site is worth getting a link from.

Does Domain Authority affect my Google ranking directly?

No. Google does not use Domain Authority in its ranking algorithm. However, the factors that build DA — quality backlinks — do affect ranking. So while the DA score itself is not a ranking factor, the link profile that creates it is.

How long does it take to improve Domain Authority?

Domain Authority updates monthly, but real improvement takes months or years. You need to earn new links consistently, and those links need to come from authoritative sites. Most websites see noticeable DA growth after six to twelve months of active link-building.

Should I worry if my Domain Authority dropped?

A small drop (1 to 2 points) is normal and often just noise in Moz's calculation. A large drop (5+ points) might mean you lost important links, a linking site was penalized, or Moz updated its algorithm. Check your backlinks in a tool like Ahrefs or Search Console to see what changed.